Prof. Jan Holnicki-Szulc, Ph.D., Dr. Habil., Eng.

Department of Intelligent Technologies (ZTI)
position: professor
telephone: (+48) 22 828 74 93
telephone: (+48) 22 826 12 81 ext.: 355
room: 430
e-mail: holnicki
personal site: http://bluebox.ippt.pan.pl/~holnicki/index.php

Doctoral thesis
1973O sprężaniu ustrojów ciągłych układami cięgien 
supervisor -- Prof. Zbigniew Wasiutyński, Ph.D., Dr. Habil., Eng., IPPT PAN
222 
Professor
1999Title of professor
Supervision of doctoral theses
1.2016-06-30Wiszowaty Rafał  Projektowanie i badanie adaptacyjnych pneumatycznych absorberów energii uderzenia1284
 
2.2015-03-26Knor Grzegorz  Identyfikacja, modelowanie i sterowanie polami temperatury w konstrukcjach betonowych1085
 
3.2012-06-28Graczykowski Cezary Inflatable Structures for Adaptive Impact Absorption649
 
4.2011-10-27Pawłowski Piotr  Systemy adaptacyjnej absorpcji obciążeń udarowych: identyfikacja udaru, sterowanie absorberów, dyssypacja energii644
 
5.2011-06-30Sekuła Krzysztof  Real-time dynamic load identification641
 
6.2011-06-30Kokot Marek  Damage identification in electrical network for structural health monitoring642
 
7.2009-01-22Wikło Marcin  Projektowanie ustrojów adaptacyjnych poddawanych obciążeniom udarowym625
 
8.2008-11-27Mikułowski Grzegorz  Adaptive impact absorbers based on magnetorheological fluids619
 
9.2008-06-05Świercz Andrzej  Identyfikacja defektów w konstrukcjach prętowych na podstawie metody dystorsji wirtualnych w domenie częstości615
 
10.2007-06-14Orłowska Anita  Delaminacja wiotkich ustrojów sprężystych-modelowanie, identyfikacja, sterowanie602
 
11.2005Nasher Nagib Ghaleb  Modelling, Diagnostics and Control of Water Networks using Virtual Distortion Method 
12.2004Zieliński Tomasz  Metoda impulsowych dystorsji wirtualnych z zastosowaniem do modelowania i identyfikacji defektów w konstrukcjach 
13.2003Flont Paweł  Aktywne sterowanie kształtu kolejowego torowiska mostowego 
14.2001Wiącek Dariusz  Monitorowanie, ocena i przewidywanie rozwoju zniszczeń w budynkach historycznych 
15.2001Knap Lech  Aktywne rozpraszanie energii zderzeń w ustrojach adaptacyjnych 
16.1998Kołakowski Przemysław  Analiza wrażliwości i optymalne projektowanie konstrukcji kratowych metodą dystorsji wirtualnych 

Recent publications
1.Chikahiro Y., Ario I., Nakazawa M., Ono S., Holnicki-Szulc J., Pawłowski P., Graczykowski C., Watson A., Experimental and numerical study of full-scale scissor type bridge, Automation in Construction, ISSN: 0926-5805, DOI: 10.1016/j.autcon.2016.05.007, Vol.71, pp.171-180, 2016
Abstract:

Mobile Bridge™ is a deployable bridge that uses a scissors mechanism to achieve its useful structural form. The bridge has a compact size in its undeployed state and can be transported easily to where it is needed. Its rapid deployment makes this type of bridge very useful in areas struck by natural disasters by enabling vehicles to cross terrain that has been made impassable. In previous research, experiments and analyses were conducted on a small-scale bridge designed for pedestrians. In order to consider a bridge of increased size, it is necessary to assess whether design and analysis techniques of the small scale bridge are applicable to the full-scale one. In this paper, we consider a full-scale deployable bridge with a lower deck and two scissor units, that allows for a light vehicle to pass across. We have carried out a light vehicle loading test in order to investigate its basic structural characteristics. Furthermore, the paper presents the theoretical design method and numerical models based on the experimental work followed by validation and comparison with the obtained experimental values.

Keywords:

Full-scale Mobile Bridge, Scissor type of emergency bridge, Scissors mechanism, Vehicle loading test

Affiliations:
Chikahiro Y.-Shinshu University (JP)
Ario I.-Hiroshima University (JP)
Nakazawa M.-Tohoku Gakuin University (JP)
Ono S.-Japan Construction Method and Machinery Research Institute (JP)
Holnicki-Szulc J.-IPPT PAN
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Watson A.-Loughborough University (GB)
2.Faraj R., Holnicki-Szulc J., Knap L., Seńko J., Adaptive inertial shock-absorber, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/25/3/035031, Vol.25, pp.035031-1-9, 2016
Abstract:

This paper introduces and discusses a new concept of impact absorption by means of impact energy management and storage in dedicated rotating inertial discs. The effectiveness of the concept is demonstrated in a selected case-study involving spinning management, a recently developed novel impact-absorber. A specific control technique performed on this device is demonstrated to be the main source of significant improvement in the overall efficiency of impact damping process. The influence of various parameters on the performance of the shock-absorber is investigated. Design and manufacturing challenges and directions of further research are formulated.

Keywords:

adaptive impact absorption, adaptive inerter, semi-active control, shock-absorber

Affiliations:
Faraj R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Knap L.-Warsaw University of Technology (PL)
Seńko J.-Warsaw University of Technology (PL)
3.Graczykowski C., Orłowska A., Holnicki-Szulc J., Prestressed composite structures – Modeling, manufacturing, design, COMPOSITE STRUCTURES, ISSN: 0263-8223, DOI: 10.1016/j.compstruct.2016.02.085, Vol.151, pp.172-182, 2016
Abstract:

This paper presents a preliminary research aimed at developing a comprehensive approach to modeling, manufacturing and optimal design of prestressed FRP composite structures. A simple and effective analytical model of prestressed composite is derived and further verified by two numerical models and the results of the experimental tests conducted on manufactured prestressed composite samples. The model reveals beneficial influence of prestress on strain and stress distribution in particular plies and resulting improvement of the global response of the composite. A design case-study of prestressed composite is presented and challenges related to design and application of more complicated composite prestressed structures are discussed.

Keywords:

Prestressed structures, Laminated composites, Prestressed FRP reinforced composites

Affiliations:
Graczykowski C.-IPPT PAN
Orłowska A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
4.Holnicki-Szulc J., Ichchou M., Duan Z., Jankowski Ł., Adaptive Impact Absorption, MATHEMATICAL PROBLEMS IN ENGINEERING, ISSN: 1024-123X, DOI: 10.1155/2016/4871549, Vol.2016, pp.4871549-1-2, 2016
Abstract:

The surging quest for safety is a clearly visible trend in modern societies. One of the related areas of research is the design of systems protecting against heavy dynamic loads such as low and medium velocity traffic-related impacts and environmental loadings. Commonly applied passive systems are typically designed to withstand a specified, well-defined heavy load scenario, which limits their performance over any wider range of loads, including the less heavy loads that are encountered in the lifetime of a typical structure much more often than the maximum limiting loads.

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Ichchou M.-École Centrale de Lyon (FR)
Duan Z.-Shenzhen Graduate School of Harbin Institute of Technology (CN)
Jankowski Ł.-IPPT PAN
5.Suwała G., Knap L., Holnicki-Szulc J., Prestressing for Reduction of Local Vibrations in a Rotorcraft, ENGINEERING TRANSACTIONS (ROZPRAWY INŻYNIERSKIE), ISSN: 0867-888X, Vol.64, No.3, pp.367-380, 2016
Abstract:

The main objective of this paper is to investigate the possibility of local structural vibration uppression via introducing initial prestressing. In order to evaluate the effectiveness of the proposed method, a two-step approach has been used. Firstly, a prestressed modal analysis has been conducted to measure the influence of the prestressing on changes of eigenfrequencies and eigenmodes. In the second step, a steady dynamic analysis has been performed to harmonic excitation to demonstrate the reduction of local amplitudes. Numerical experiments have been conducted on the model of a small rotorcraft. Our results indicate that introduction of initial prestressing may be used to affect natural structure frequancies and to lower amplitude of vibrations of the structure exposed to external extortions.

Keywords:

Prestressing, vibration suppression.

Affiliations:
Suwała G.-IPPT PAN
Knap L.-Warsaw University of Technology (PL)
Holnicki-Szulc J.-IPPT PAN
6.Graczykowski C., Holnicki-Szulc J., Crashworthiness of Inflatable Thin-Walled Structures for Impact Absorption, MATHEMATICAL PROBLEMS IN ENGINEERING, ISSN: 1024-123X, DOI: 10.1155/2015/830471, Vol.2015, pp.830471-1-22, 2015
Abstract:

The paper describes application of innovative, inflatable thin-walled structures for absorption of the impact loading and thoroughly investigates their crash characteristics. The proposed concept assumes inflation of thin-walled structures with compressed gas of appropriately adjusted pressure in order to improve their basic mechanical properties, enhance energy dissipation capabilities, and increase corresponding durability to impact loading. In the first part of the paper the influence of compressed gas on mechanical characteristics of aluminium beverage can is analysed experimentally and by the corresponding numerical simulations. The following section proposes and numerically verifies three diverse engineering applications of inflatable thin-walled structures for impact absorption. Finally, the last part introduces the concept of adaptive inflatable barrier and briefly presents three simple strategies of pressure control. Both the performed basic experiment and the conducted numerical simulations show the advantageous influence of compressed gas and prove the feasibility of using inflatable thin-walled structures for impact absorption.

Keywords:

thin-walled structures, inflatable structures, crashworthiness

Affiliations:
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
7.Mróz A., Holnicki-Szulc J., Biczyk J., Prestress Accumulation-Release Technique for Damping of Impact-Born Vibrations: Application to Self-Deployable Structures, MATHEMATICAL PROBLEMS IN ENGINEERING, ISSN: 1024-123X, DOI: 10.1155/2015/720236, Vol.2015, pp.720236-1-9, 2015
Abstract:

A numerical study is presented, which tailors so-called prestress accumulation-release (PAR) strategy to mitigate free vibrations of frame structures. First, the concept of proposed semiactive technique is outlined and possible applications are specified. In the second part of the work a parametric study is discussed, which illustrates the potential of the method for mitigation of free vibrations induced by impact or other initial load scenarios. Special attention is given to the energy balance including all relevant contributions to the total energy of the considered dissipative system. The proposed technique shows a very high potential in mitigation of free vibrations, exceeding 99% of the reference amplitude after 5 cycles of vibration.

Affiliations:
Mróz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Biczyk J.-Adaptronica Sp. z o. o. (PL)
8.Holnicki-Szulc J., Graczykowski C., Mikułowski G., Mróz A., Pawłowski P., Wiszowaty R., Adaptive Impact Absorption - the Concept and Potential Applications, INTERNATIONAL JOURNAL OF PROTECTIVE STRUCTURES, ISSN: 2041-4196, DOI: 10.1260/2041-4196.6.2.357, Vol.6, No.2, pp.357-377, 2015
Abstract:

Adaptive Impact Absorption focuses on adaptation of energy absorbing structures to actual dynamic loading by using system of sensors detecting and identifying impact in advance and embedded semi-active dissipaters with controllable mechanical properties. Application of such devices allows to modify dynamic characteristics of the structure during the period of impact and to precisely control the process of energy dissipation. The paper presents an overview of research conducted at the Department of Intelligent Technologies of the Institute of Fundamental Technological Research dedicated to design and applications of various systems of Adaptive Impact Absorption. Wide range of presented examples covers adaptive hydraulic and pneumatic landing gears, skeletal systems equipped with controllable elements and detachable joints as well as adaptive inflatable structures.

Keywords:

adaptive impact absorption, safety engineering, smart structures, optimal control

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Graczykowski C.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Pawłowski P.-IPPT PAN
Wiszowaty R.-IPPT PAN
9.Basu B., Bursi O.S., Cascati F., Cascati S., Del Grosso A.E., Domaneshi M., Faravelli L., Holnicki-Szulc J., Irshik H., Krommerm M., Lepidi M., Martelli A., Ozturk B., Pozo F., Pujol G., Rakicevic Z., Rodellar J., A European Association for the Control of Structures joint perspective. Recent studies in civil structural control across Europe, STRUCTURAL CONTROL AND HEALTH MONITORING, ISSN: 1545-2255, DOI: 10.1002/stc.1652, Vol.21, No.12, pp.1414-1436, 2014
Abstract:

Structural control has been comprehensively studied over the world as a multidisciplinary research field. The present work is motivated by an attempt to give a common frame to the recent research and applications of structural control technology in civil engineering across Europe. They include novel passive dampers, functional materials and semi-active dampers, active control systems, and their performance investigations. Design methods for the vibrations reduction of buildings, bridges, and wind turbines are discussed with reference to case studies. Control algorithms and dimension reduction techniques are also studied. Adaptation strategies and techniques based on the potential offered by piezoelectricity are reviewed.

Affiliations:
Basu B.-Trinity College (IE)
Bursi O.S.-University of Trento (IT)
Lepidi M.-University of Genova (IT)
Martelli A.-GLIS and ISSO (IT)
Ozturk B.-Hacettepe University (TR)
Pozo F.-Universitat Politècnica de Catalunya (ES)
Pujol G.-Universitat Politècnica de Catalunya (ES)
Rakicevic Z.-Institute of Earthquake Engineering and Engineering Seismology (MK)
Rodellar J.-Universitat Politècnica de Catalunya (ES)
Cascati F.-University of Pavia (IT)
Cascati S.-University of Catania (IT)
Del Grosso A.E.-University of Genova (IT)
Domaneshi M.-Politecnico di Milano (IT)
Faravelli L.-Politecnico di Torino (IT)
Holnicki-Szulc J.-IPPT PAN
Irshik H.-Johannes Kepler University (AT)
Krommerm M.-Johannes Kepler University (AT)
10.Mikułowski G., Wiszowaty R., Holnicki-Szulc J., Characterization of a piezoelectric valve for an adaptive pneumatic shock absorber, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/22/12/125011, Vol.22, No.12, pp.125011-1-12, 2013
Abstract:

This paper describes a pneumatic valve based on a multilayer piezoelectric actuator and Hörbiger plates. The device was designed to operate in an adaptive pneumatic shock absorber. The adaptive pneumatic shock absorber was considered as a piston–cylinder device and the valve was intended to be installed inside the piston. The main objective for the valve application was regulating the gas flow between the cylinder's chambers in order to maintain the desired value of the reaction force generated by the shock absorber. The paper describes the design constraints and requirements, together with results of analytical modelling of fluid flow verified versus experimentally obtained data. The presented results indicate that the desired performance characteristics of the valve were obtained. The geometrical constraints of the flow ducts were studied and the actuator's functional features analysed.

Affiliations:
Mikułowski G.-IPPT PAN
Wiszowaty R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
11.Sekuła K., Graczykowski C., Holnicki-Szulc J., On-line impact load identification, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.3233/SAV-2012-0732, Vol.20, No.1, pp.123-141, 2013
Abstract:

The so-called Adaptive Impact Absorption (AIA) is a research area of safety engineering devoted to problems of shock absorption in various unpredictable scenarios of collisions. It makes use of smart technologies (systems equipped with sensors, controllable dissipaters and specialised tools for signal processing). Examples of engineering applications for AIA systems are protective road barriers, automotive bumpers or adaptive landing gears. One of the most challenging problems for AIA systems is on-line identification of impact loads, which is crucial for introducing the optimum real-time strategy of adaptive impact absorption. This paper presents the concept of an impactometer and develops the methodology able to perform real-time impact load identification. Considered dynamic excitation is generated by a mass M1 impacting with initial velocity V0. An analytical formulation of the problem, supported with numerical simulations and experimental verifications is presented. Two identification algorithms based on measured response of the impacted structure are proposed and discussed. Finally, a concept of the AIA device utilizing the idea of impactometer is briefly presented.

Keywords:

Impact load identification, Adaptive Impact Absorption, adaptive structures, real-time systems, impact tests

Affiliations:
Sekuła K.-IPPT PAN
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
12.Knor G., Glinicki M.A., Holnicki-Szulc J., Ossowski A., Ranachowski Z., Influence of calcareous fly ash on the temperature of concrete in massive elements during the first 72 hours of hardening, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.013.009, Vol.12, No.1, pp.113-126, 2013
Abstract:

As a measure to avoid thermally induced cracking in massive concrete, mineral admixtures are often added as a substitute for a certain portion of cement. This paper presents the results of testing in course of which the temperature was measured during hardening of concrete mixtures produced with addition of calcareous fly ash obtained from the Power Station in Bełchatów, Poland. The investigation covered 76 concrete mixtures produced with three different aggregates and diverse binder content. In the experimental part of the research, the thermal parameters of hardening concrete were determined with a specially developed method in which the mixture was placed in a one-dimensional mould which allowed for unrestrained flow of heat in one direction. The results of testing were used to assess the influence of the respective ingredients, in particular calcareous fly ash, on the rate of rise of the fresh concrete temperature, on the time of occurrence of the maximum temperature and on the temperature gradients. Finally, a formula for calculating the specific heat of hydration depending on the mixture composition was proposed.

Keywords:

high calcium fly ash, fresh concrete temperature, heat of hydration, massive concrete, multicomponent cement, temperature gradient

Affiliations:
Knor G.-IPPT PAN
Glinicki M.A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Ossowski A.-IPPT PAN
Ranachowski Z.-IPPT PAN
13.Knor G., Holnicki-Szulc J., SHM System for Monitoring and Prediction of Cracks Development in Concrete Structures, Advances in Science and Technology, ISSN: 1662-0356, DOI: 10.4028/www.scientific.net/AST.83.132, Vol.83, pp.132-137, 2013
Abstract:

This paper describes the concept of monitoring the massive concrete structures based on the inverse problem solution. Properties of young concrete are changing very intensively in the early stage of hydration process, and therefore it is very important to know material constants as a function of age of concrete in order to accurately modeling the phenomena occurring in it. The main idea is to determine the time-dependent thermal properties of concrete on the basis of point temperature measurements in a small laboratory molds. Then, based on these parameters, the coupled thermo-mechanical equations are solved to describe the maturation and aging of concrete. This allows to specify (at the design stage) the potential risk of structural damage (e.g. thermal cracking) and thus prevent them e.g. through the use of intelligent cooling systems. Own, based on finite element method, software TMC (Thermal & Mechanical modeling of Concrete) gives also the possibility of predicting the formation of cracks during the aging of structure, which will be verified by means of electric sensor networks (so called ELGRID). This integration will enable to provide a complete system for monitoring and prediction of the structural stress state and damage development.

Keywords:

Early Age Concrete, Inverse Heat Transfer Problem, Thermal Cracking of Concrete, Thermal Stress

Affiliations:
Knor G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
14.Knor G., Glinicki M.A., Holnicki-Szulc J., Determination of thermal parameters of hardening concrete by means of inverse problem solution, Roads and Bridges - Drogi i Mosty, ISSN: 1643-1618, DOI: 10.7409/rabdim.012.002, Vol.11, No.4, pp.281-294, 2012
Abstract:

The paper presents the procedure of determining the thermophysical properties of concrete: heat of hardening, thermal conductivity and specific heat, which is based on point temperature measurements in a cylindrical mold and the numerical solution of the inverse heat transfer problem. The procedure was tested on concrete materials made with high-calcium fly ashes. The obtained results show good agreement with the real values of individual parameters and can be used to determine the temperature field in the object of any complex shape.

Keywords:

calcerous fly ash, heat equation, inverse problem, massive concrete, thermal gradient

Affiliations:
Knor G.-IPPT PAN
Glinicki M.A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
15.Orłowska A., Kołakowski P., Holnicki-Szulc J., Detecting delamination zones in composites by embedded electrical grid and thermographic methods, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/20/10/105009, Vol.20, No.10, pp.105009-1-9, 2011
Abstract:

The proposed approach assumes that the composite structure is equipped with a specially designed electrical circuit with a 3D grid layout, composed of high resistivity elements embedded in the structure. The special layout of the electrical circuit activated by small currents provides scattered sources of thermal field in the laminate. It is assumed that the circuit elements exhibit failure which is coincident with the commencement of delamination. These breaks in the electrical circuit cause variations in the thermal field which can be observed by a long-wave thermovision camera. The paper is focused on two research aspects. First, some numerical simulations are presented to examine the potential of the idea itself. Next, a simple experiment using a composite sample with a hand-fabricated electrical grid is described. The performance of the grid for an arbitrarily selected position of defect in the investigated composite shows high potential for damage detection.

Affiliations:
Orłowska A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
16.Mróz A., Orłowska A., Holnicki-Szulc J., Semi-active damping of vibrations. Prestress Accumulation-Release strategy development, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.3233/SAV-2010-0502, Vol.17, pp.123-136, 2010
Abstract:

New method for semi-active control of vibrating structures is introduced. So-called Prestress Accumulation-Release (PAR) strategy aims at releasing of the strain energy accumulated in the structure during its deformation process. The strain energy is converted into kinetic energy of higher modes of vibration which is suppressed with structural damping or by means of a damping device. The adaptation process essentially affects the first mode vibrations by introducing an elastic force that opposes the movement. Numerical simulations as well as experimental results prove that the strategy can be very effective in mitigating of the fundamental mode of a free – vibrating structure. In a numerical example 95% of the vibration amplitude was mitigated after two cycles. An experimental demonstrator shows 85% reduction of the amplitude in a cantilever free- vibrations. In much more complex practical problems smaller portion of total energy can be released from the system in each cycle, nevertheless the strategy could be applied to mitigate the vibrations of, for example, pipeline systems or pedestrian walkways.

Affiliations:
Mróz A.-IPPT PAN
Orłowska A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
17.Wikło M., Holnicki-Szulc J., Optimal design of adaptive structures: Part I. Remodeling for impact reception, STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, ISSN: 1615-147X, DOI: 10.1007/s00158-008-0233-8, Vol.37, No.3, pp.305-318, 2009
Abstract:

The paper (written in two parts) is devoted to the presentation of numerical tools, based on the so-called virtual distortion method (VDM) for fast structural reanalysis and to the application of this tools for optimal design of adaptive structures exposed to impact loads. The first paper deals with fast modifications of the material distribution (coupled stiffness and mass redistribution) in dynamically loaded structures, which allows their optimal remodeling, e.g., to minimize average deflections. The VDM-based approach allows analytical sensitivity determination, which is very helpful in efficient implementation of the optimization procedure, utilized to solve the defined remodeling problem. The presented methodology is illustrated with a numerical example of truss–beam structure exposed to random impact loads.

Keywords:

Fast structural reanalysis, Virtual distortion method, Adaptive impact absorption, Optimal design, Impact loads

Affiliations:
Wikło M.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
18.Wikło M., Holnicki-Szulc J., Optimal design of adaptive structures: Part II. Adaptation to impact loads, STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, ISSN: 1615-147X, DOI: 10.1007/s00158-008-0242-7, Vol.37, No.4, pp.351-366, 2009
Abstract:

This paper is a continuation of the article entitled “Remodeling for Impact Reception.” It presents a generalization of the previously discussed concept on optimal remodeling of elasto-plastic structures exposed to impact load, where remodeling process is simulated via virtual distortion method (VDM). The resultant stiffest structure determined in the first part of this paper determines the initial configuration to design the optimal adaptive structure. It is assumed that considered structure can be equipped with so-called structural fuses with plastic-like behavior and controllable yield stress levels. Such an adaptive structure can still be optimized by the proper selection of locations for structural fuses and by the proper tuning of yield stress levels to the identified impact load. Maximization of the impact energy dissipation as the objective function allows significant reduction of residual vibrations after a few milliseconds. VDM-based algorithms for fast, complex reanalysis of dynamically loaded elasto-plastic structures and their sensitivity analysis are the key tools for the above-mentioned optimization procedures.

Keywords:

Fast structural reanalysis, Virtual distortion method, Adaptive impact absorption, Optimal design, Impact loads

Affiliations:
Wikło M.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
19.Kokot M., Holnicki-Szulc J., Defect identification in electrical circuits via the virtual distortion method. Part 1: steady-state case, JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES, ISSN: 1045-389X, DOI: 10.1177/1045389X09337169, Vol.20, No.12, pp.1465-1473, 2009
Abstract:

Virtual Distortion Method, a numerical technique originally developed and applied to various optimization problems in structural mechanics, is adapted to DC/AC circuit analysis. Electro-mechanical analogies with discrete models of plain truss structures are utilized to introduce and implement the main concepts of the method. Simulation of conductance modifications in circuit elements by the equivalent set of virtual sources is a foundation of numerically effective algorithms enabling fast re-analysis and sensitivity analysis. Inverse problem of defect identification is discussed and solution based on distortion approach is provided.

Keywords:

optimization, embedded intelligence, structural health monitoring

Affiliations:
Kokot M.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
20.Graczykowski C., Holnicki-Szulc J., Protecting offshore wind turbines against ship impacts by means of Adaptive inflatable Structures, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.3233/SAV-2009-0473, Vol.16, No.4, pp.335-353, 2009
Abstract:

Collisions with small service ships are serious danger for offshore wind turbines. Installing torus-shaped adaptive inflatable structure that surrounds a wind turbine tower at water level is one method of effective protection. Proposed pneumatic structure contains several separate air chambers equipped with devices for fast inflation and pressure release. The system can be adapted to various impact scenarios by adjusting the level of initial pressure in each chamber and by controlling the release of compressed air during collision. The paper presents finite element simulation of ship collision with wind turbine tower protected by pneumatic structure, conducted using ABAQUS software. Introduced methods of pressure adjustment are aimed at mitigating tower and ship response. The performed feasibility study proves that inflatable structure can effectively protect the wind turbine tower and the ship against serious damage.

Keywords:

Adaptive inflatable structures, pneumatic structures, adaptive impact absorption, flow control, offshore structures, ship collisions

Affiliations:
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
21.Holnicki-Szulc J., Graczykowski C., Mikułowski G., Mróz A., Pawłowski P.K., Smart technologies for adaptive impact absorption, SOLID STATE PHENOMENA, ISSN: 1012-0394, DOI: 10.4028/www.scientific.net/SSP.154.187, Vol.154, pp.187-194, 2009
Abstract:

The article presents a review of recent research carried out in the Department of Intelligent Technologies of Institute of Fundamental Technological Research, dedicated to application of systems for adaptive impact absorption to adaptive aircraft landing gears, novel concept of protective MFM structures, flow-control based airbags, maritime applications of inflatable structures, and development of adaptive wind turbine blade – hub connections.

Keywords:

Adaptive Impact Absorption, Adaptive Structure, Optimal Control

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Graczykowski C.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Pawłowski P.K.-IPPT PAN
22.Mróz A., Holnicki-Szulc J., Karna T., Mitigation of ice loading on off-shore wind turbines: Feasibility study of a semi-active solution, COMPUTERS AND STRUCTURES, ISSN: 0045-7949, DOI: 10.1016/j.compstruc.2007.01.039, Vol.86, pp.217-226, 2008
Abstract:

This paper focuses on mitigation of dynamic loading induced on off-shore towers by drifting ice. Conical structures attached to off-shore towers at water level are widely used to reduce static and dynamic ice actions. The level of remaining forces is enough to cause severe tower vibrations, therefore a need for an additional device to reduce the remaining actions is recognized. Present study introduces a new, compliant connection between the cone and the tower. Parameters of the connection are controlled semi-actively to optimize the effect. Numerical studies are made to roughly estimate the effectiveness of the new solution. First, contact problem of ice sheet and cone is simulated using simplified material model for ice. Then a numerical model of a wind turbine tower is constructed. Dynamic interaction between cone and tower is simulated and the new solution effectiveness is discussed.

Keywords:

Impact load mitigation, Semi-active control, Conical structures, Ice loading, Off-shore wind turbine, Structural dynamics

Affiliations:
Mróz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Karna T.-other affiliation
23.Orłowska A., Kołakowski P., Holnicki-Szulc J., Modelling and identification of delamination in double-layer beams by the virtual distortion method, COMPUTERS AND STRUCTURES, ISSN: 0045-7949, DOI: 10.1016/j.compstruc.2008.05.008, Vol.86, pp.2203-2214, 2008
Abstract:

The problem of modelling and identification of delamination in double-layer beams has been undertaken within the framework of the virtual distortion method. For delamination modelling, a concept of the contact layer has been proposed, assuming simple but effective truss connections. The laminate layers have been modelled with Bernoulli beams. Good correspondence of the delamination model with experiments has been observed despite disregarding the friction between layers. An algorithm for off-line identification of delamination, solving an inverse problem with the use of gradient optimization, has been proposed. For double cantilever beam examples, two co-existing delamination zones have been successfully detected. An idea of on-line identification of delamination has been put forward, too.

Keywords:

Delamination, Double-layer beams, Identification, Inverse problem

Affiliations:
Orłowska A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
24.Rak M., Ichchou M., Holnicki-Szulc J., Identification of structural loss factor from spatially distributed measurements on beams with viscoelastic layer, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2007.11.026, Vol.310, pp.801-811, 2008
Abstract:

The problem of estimation of a structural loss factor for a beam covered with a viscoelastic layer is addressed in the paper. Two estimation methods based on analytical models for wave propagation in viscoelastic homogenous beams are tested. The methods use different theoretical solutions for spatial distribution of a wave field in the beam. The solutions depend on a complex wave number and frequency. At each frequency within an investigated range the wave number, for which model predictions best approximate experimental response, is found. Structural loss factor is calculated based on the identified value of wave number. Experimental data are measured in a cantilever beam test. For verification purposes the obtained values of loss factor are compared with the results of Oberst test. The presented methods enable determination of loss factor for arbitrary discrete frequencies. They provide an alternative to modal techniques which estimate only values of the parameter corresponding to resonant frequencies.

Affiliations:
Rak M.-other affiliation
Ichchou M.-École Centrale de Lyon (FR)
Holnicki-Szulc J.-IPPT PAN
25.Świercz A., Kołakowski P., Holnicki-Szulc J., Damage identification in skeletal structures using the virtual distortion method in frequency domain, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, ISSN: 0888-3270, DOI: 10.1016/j.ymssp.2008.03.009, Vol.22, No.8, pp.1826-1839, 2008
Abstract:

The paper is a continuation of research on the application of a structural reanalysis method—the virtual distortion method—to structural health monitoring. The first approach, formulated previously in the time domain, suffered from a considerable numerical cost. In order to reduce it, this paper presents an alternative approach, formulated in the frequency domain thanks to the assumption of using harmonic excitation (quasi-static problem). The hardware devices supposed to collect structural responses are piezoelectric patch sensors. The software tool for damage identification solves a nonlinear least squares optimization problem by employing analytically derived sensitivities. Strains are the analyzed quantities, contributing to the objective function. Considerations are restricted to skeletal structures and a simplified dynamic problem with no damping. Effectiveness of the frequency-domain identification is demonstrated in numerical examples. Experimental verification is envisaged.

Keywords:

Damage identification, Inverse problem, Frequency domain, Skeletal structures, Reanalysis methods

Affiliations:
Świercz A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
26.Kołakowski P., Wikło M., Holnicki-Szulc J., The Virtual Distortion Method - a versatile reanalysis tool for structures and systems, STRUCTURAL AND MULTIDISCIPLINARY OPTIMIZATION, ISSN: 1615-147X, DOI: 10.1007/s00158-007-0158-7, Vol.36, No.3, pp.217-234, 2008
Abstract:

For 20 years of development, the virtual distortion method (VDM) has proved to be a versatile reanalysis tool in various applications, including structures and truss-like systems. This article presents a summary of principal achievements, demonstrating the capabilities of the VDM both in statics and dynamics, in linear and nonlinear analysis. The major advantage of VDM is its exactness and no need for matrix inversion in the reanalysis algorithm. The influence matrix—numerical core of the VDM—contains the whole mechanical knowledge about a structure, by looking at all global responses due to local disturbances. The strength of the method is demonstrated for truss structures.

Keywords:

Exact structural reanalysis, Sherman–Morrison–Woodbury formulas, Nonlinear statics and dynamics, System analysis

Affiliations:
Kołakowski P.-IPPT PAN
Wikło M.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
27.Mikułowski G., Holnicki-Szulc J., Adaptive landing gear koncept - feedback control validation, SMART MATERIALS AND STRUCTURES, ISSN: 0964-1726, DOI: 10.1088/0964-1726/16/6/017, Vol.16, No.6, pp.2146-2158, 2007
Abstract:

The objective of this paper is to present an integrated feedback control concept for adaptive landing gears (ALG) and its experimental validation. Aeroplanes are subjected to high dynamic loads as a result of the impact during each landing. Classical landing gears, which are in common use, are designed in accordance with official regulations in a way that ensures the optimal energy dissipation for the critical (maximum) sink speed. The regulations were formulated in order to ensure the functional capability of the landing gears during an emergency landing. However, the landing gears, whose characteristics are optimized for these critical conditions, do not perform well under normal impact conditions. For that situation it is reasonable to introduce a system that would adapt the characteristics of the landing gears according to the sink speed of landing. The considered system assumes adaptation of the damping force generated by the landing gear, which would perform optimally in an emergency situation and would adapt itself for regular landings as well. This research covers the formulation and design of the control algorithms for an adaptive landing gear based on MR fluid, implementation of the algorithms on an FPGA platform and experimental verification on a lab-scale landing gear device. The main challenge of the research was to develop a control methodology that could operate effectively within 50 ms, which is assumed to be the total duration of the phenomenon. The control algorithm proposed in this research was able to control the energy dissipation process on the experimental stand.

Affiliations:
Mikułowski G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
28.Świercz A., Kołakowski P., Holnicki-Szulc J., Structural damage identification using low frequency non-resonance harmonic excitation, KEY ENGINEERING MATERIALS, ISSN: 1662-9795, DOI: 10.4028/www.scientific.net/KEM.347.427, Vol.347, pp.427-432, 2007
Keywords:

Frequency-Based Analysis, Inverse Problem, Piezo Devices, Structural Damage Identification

Affiliations:
Świercz A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
29.Jankowski Ł., Wikło M., Holnicki-Szulc J., Robust post-accident reconstruction of loading forces, KEY ENGINEERING MATERIALS, ISSN: 1662-9795, DOI: 10.4028/www.scientific.net/KEM.347.659, Vol.347, pp.659-664, 2007
Abstract:

The paper presents a novel methodology for robust post-accident reconstruction of spatial and temporal characteristics of the load. The methodology is based on analysis of local structural response, and identifies an observationally equivalent load, which in a given sense optimally approximates the real load. Compared to previous researches this approach allows to use a limited number of sensors to reconstruct general dynamic loads of unknown location including multiple impacts and moving loads. Additionally, the problem of optimum sensor location is studied.

Keywords:

impact identification, inverse dynamics, smart systems, structural health monitoring

Affiliations:
Jankowski Ł.-IPPT PAN
Wikło M.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
30.Mikułowski G., Holnicki-Szulc J., Fast controller and control algorithms for MR based adaptive impact absorbers - Force Based Control, Machine Dynamics Research, ISSN: 2080-9948, Vol.30, No.2, pp.113-122, 2006
Abstract:

Adaptive impact absorption is a modern control problem being solved nowadays for several transportation and industry branches. The objective of the impact absorption process is dissipation of the impact energy by means of generation the minimal interface forces and minimal decelerations acting on the protected structure. One of the possibilities for minimization of the impact forces is using of an adaptive actuator that enables adjusting its characteristics to the actual impact energy. The presented research was focused on development of the adaptive impact absorption procedurę and as an example of the adaptive actuator an MR damper was used. The MR damper ensured the convenient rangę of the damping forces to provide the proper controllability of the process. However, sińce impact is a very short phenomenon the performance of the device must have met very strict reąuirements in the field of time delays. High ąuality of the driving electronics is the emphasized factor influencing the system performance. The paper presents the controller for the MR damper and control algorithms with experimental verification.

Keywords:

MR damper, vibrations, damping

Affiliations:
Mikułowski G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
31.Holnicki-Szulc J., Kołakowski P., Nasher N., Leakage detection in water networks, JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES, ISSN: 1045-389X, DOI: 10.1177/1045389X05049169, Vol.16, No.3, pp.207-219, 2005
Abstract:

A health monitoring tool for leakage identification in water networks is presented. It is assumed that the water heads at the network’s nodes can be measured in different locations of some inspected area. Then, making use of the analytical network model of the actual installation and using the proposed Virtual Distortion Method (VDM) approach, leakages (single as well as in multiple locations, and their intensities) can be detected and identified in the system. The identification methodology takes advantage of a gradient-based optimization technique.

Keywords:

damage identification, water networks, system theory

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Kołakowski P.-IPPT PAN
Nasher N.-other affiliation
32.Kokot M., Holnicki-Szulc J., Health monitoring of electric circuits, KEY ENGINEERING MATERIALS, ISSN: 1662-9795, DOI: 10.4028/www.scientific.net/KEM.293-294.669, Vol.293-294, pp.669-676, 2005
Abstract:

A methodology of defect identification in linear DC circuits based on so called Virtual Distortion Method (VDM) will be presented. The proposed approach takes adventage of the analogy linking mechanical models of truss structures and electric circuits. In this paper we cover the issue of modelling defects in electric circuits by compatible state of distortions, next we introduce the concept of influence matrix Dij, which describes global sensitivity of the circuit and enables fast recalculation of system response, and we formulate a gradient method of defect identification (inverse problem) based on local current and voltage measurements. In the following analysis we focus on so-called impotent states of distortions, which are the source of ambiguity of solution. We show that these difficulties can be overcome by a proper measuring strategy.

Keywords:

Defect Identification, Electric Circuits Monitoring, Inverse Problem

Affiliations:
Kokot M.-other affiliation
Holnicki-Szulc J.-IPPT PAN
33.Flont P., Holnicki-Szulc J., Bridges with adaptive railway track, JOURNAL OF THEORETICAL AND APPLIED MECHANICS, ISSN: 1429-2955, Vol.3, No.40, pp.533-547, 2002
34.Holnicki-Szulc J., Damping of Vibration by Actively Controlled Initial Distortions, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.43, pp.1-32, 1989
35.Holnicki-Szulc J., Modyfikacje konstrukcji symulowane polami dystorsji, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.9, pp.1-35, 1987
36.Holnicki-Szulc J., Structural Clearances and Internal Friction, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.13, pp.1-19, 1987
37.Holnicki-Szulc J., Optimal Strategy of Avoiding Resonance, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.33, pp.1-20, 1987
38.Wiśniewski K., Holnicki-Szulc J., Rozwiązania konstrukcyjne i sterowanie pracą cieplarni słonecznej, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.40, pp.1-74, 1987
39.Holnicki-Szulc J., O optymalnym modelowaniu na minimum lokalnego ugięcia, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.18, pp.1-17, 1984
40.Holnicki-Szulc J., Degradacja struktur sprężystych, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.22, pp.1-18, 1984
41.Holnicki-Szulc J., Struktury najsztywniejsze, najlżejsze i najmocniejsze, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.35, pp.1-23, 1983
42.Holnicki-Szulc J., Zagadnienia dystorsji sprężystych w wieloelementowych układach konstrukcyjnych; Analiza, identyfikacja, sterowanie (Praca habilitacyjna), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.27, pp.1-229, 1980
43.Holnicki-Szulc J., Szularz M., Optymalne sprężanie wieloelementowych układów kratowych, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.56, pp.1-25, 1978
44.Holnicki-Szulc J., Analiza geometrycznej niezmienności wieloelementowych układów konstrukcyjnych, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.6, pp.1-32, 1976
45.Holnicki-Szulc J., Marks W., Zagadnienie optymalizacji ustrojów o rozproszonych cięgnach sprężających, Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.1, pp.1-26, 1974
46.Holnicki-Szulc J., O optymalizacji ustrojów płaskich sprężonych ciągłymi układami cięgien (Praca doktorska), Prace IPPT - IFTR Reports, ISSN: 2299-3657, No.16, pp.1-152, 1971

List of recent monographs
1.
531
Holnicki-Szulc J., Gierliński J.T., Structural Analysis, Design and Control by the Virtual Distortion Method, Wiley, pp.1-318, 1995
List of chapters in recent monographs
1.
417
Chikahiro Y., Ario I., Nakazawa M., Ono S., Holnicki-Szulc J., Pawłowski P., Graczykowski C., Mobile and Rapidly Assembled Structures IV, rozdział: An Experimental Study On The Design Method Of A Real-sized Mobile Bridge For A Moving Vehicle, N. De Temmerman,Vrije, C.A. Brebbia, WITPress, pp.93-106, 2014
2.
349
Jankowski Ł., Holnicki-Szulc J., Świercz A., Mróz M., Kołakowski P., Monitorowanie obciążeń i stanu technicznego konstrukcji mostowych, rozdział: Numeryczne metody identyfikacji parametrów konstrukcji, IPPT Reports on Fundamental Technological Research, pp.109-159, 2014
3.
363
Holnicki-Szulc J., Kokot M., Kołakowski P., Monitorowanie obciążeń i stanu technicznego konstrukcji mostowych, rozdział: System identyfikacji spękań w konstrukcjach betonowy, IPPT Reports on Fundamental Technological Research, pp.160-188, 2014
4.
195
Mróz A., Orłowska A., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: Adaptive damping of vibration by the prestress accumulation/release strategy, Wiley, Holnicki-Szulc J. (Ed.), pp.251-267, 2008
5.
196
Pawłowski P.K., Mikułowski G., Graczykowski C., Ostrowski M., Jankowski Ł., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: Adaptive impact absorption, Wiley, Holnicki-Szulc J. (Ed.), pp.153-213, 2008
6.
197
Jankowski Ł., Sekuła K., Błachowski B.D., Wikło M., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: Dynamic load monitoring, Wiley, Holnicki-Szulc J. (Ed.), pp.105-151, 2008
7.
198
Holnicki-Szulc J., Motylewski J., Kołakowski P., Smart technologies for safety engineering, rozdział: Introduction to smart technologies, Wiley, Holnicki-Szulc J. (Ed.), pp.1-9, 2008
8.
200
Kołakowski P., Wikło M., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: The virtual distortion method - a versatile reanalysis tool, Wiley, Holnicki-Szulc J. (Ed.), pp.11-35, 2008
9.
201
Kołakowski P., Świercz A., Orłowska A., Kokot M., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: VDM-Based health monitoring of engineering systems, Wiley, Holnicki-Szulc J. (Ed.), pp.37-103, 2008
10.
202
Wikło M., Jankowski Ł., Mróz M., Holnicki-Szulc J., Smart technologies for safety engineering, rozdział: VDM-Based remodeling of adaptive structures exposed to impact loads, Wiley, Holnicki-Szulc J. (Ed.), pp.215-249, 2008
11.
530
Holnicki-Szulc J., Mróz Z., Structural Control, rozdział: Active Control of Stresses and Deflections of Elastic Structures by Means of Imposed Distortions, Springer Netherlands, pp.297-317, 1987
Editor of monographs
1.
79
Holnicki-Szulc J., Smart technologies for safety engineering, Wiley, pp.1-350, 2008

Conference papers
1.Chikahiro Y., Ario I., Pawlowski P., Graczykowski C., Nakazawa M., Holnicki-Szulc J., Ono S., Dynamics of the scissors-type Mobile Bridge, EURODYN 2017, X International Conference on Structural Dynamics, 2017-09-10/09-13, Rome (IT), DOI: 10.1016/j.proeng.2017.09.339, No.199, pp.2919-2924, 2017
Abstract:

We have experienced many times a phenomenon in which a bridge is washed away due to a typhoon, heavy rain in the rainy season, localized torrential rain, tsunami, and other flood disasters, or in which a bridge is damaged by an earthquake or a tremor. There is accordingly increasing demand for new technology and science to restore bridges that have been washed away or damaged. The paper presents a new type of emergency bridge, called Mobile Bridge™(MB), which can be quickly constructed in case of damages after a natural disaster. The concept of the bridge is based on the application of scissor-type mechanism, which provides its rapid deployment. Up to now several experimental MBs of different size were constructed and tested. The presented research reviews fundamental numerical and experimental results for the MB version 4.0 (MB4.0). Experimental testing included strain and acceleration measurements in free and forced loading conditions. From these results, it was possible to estimate basic dynamic characteristics of the bridge. Besides, in order to provide a basis for development of new construction methods for structural reinforcement and suppression of vibrations, various numerical analyses were conducted. The conducted research allows for a better and safer design of the movable and foldable full-scale bridge, the MB.

Keywords:

deployable bridge, scissors-type bridge, emergency bridge, light-weight structure, temporary bridge

Affiliations:
Chikahiro Y.-Shinshu University (JP)
Ario I.-Hiroshima University (JP)
Pawlowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Nakazawa M.-Tohoku Gakuin University (JP)
Holnicki-Szulc J.-IPPT PAN
Ono S.-Japan Construction Method and Machinery Research Institute (JP)
2.Faraj R., Popławski B., Suwała G., Jankowski Ł., Holnicki-Szulc J., Mitigation of dynamic response in frame structures by means of smart joints, SMART 2017, 8th Conference on Smart Structures and Materials, 2017-06-05/06-08, Madrid (ES), pp.138-144, 2017
Abstract:

This paper discusses passive and semi-active techniques of structural control by means of smart joints, and then it proposes a specific smart joints system for frame structures and tests its capability in mitigation of free vibrations. Basically, the proposed solution modifies frame beams by addition of truss-type hinges, and its effectiveness relies on the softening effect that occurs in compression due to geometric nonlinearities and which triggers the highly-damped high-frequency response modes of the structure. First, the finite element (FE) model of the specific frame structure with geometrical nonlinearities is derived, and the proposed passive joints are described and incorporated into the model. Then, their principle of operation and effectiveness is examined numerically for the first two natural modes of vibrations with various initial displacement amplitudes. An objective function is proposed to assess joints placement, based on the efficiency in mitigation of the excited vibrations.

Keywords:

Vibration Damping, Structure Response, Smart Structure, Structural Control

Affiliations:
Faraj R.-IPPT PAN
Popławski B.-IPPT PAN
Suwała G.-IPPT PAN
Jankowski Ł.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
3.Jankowski Ł., Graczykowski C., Pawłowski P., Mikułowski G., Ostrowski M., Popławski B., Faraj R., Suwała G., Holnicki-Szulc J., Adaptive Self-Protection against Shock and Vibration, Advances in Science and Technology, ISSN: 1662-0356, DOI: 10.4028/www.scientific.net/AST.101.133, Vol.101, pp.133-142, 2017
Abstract:

This contribution reviews the challenges in adaptive self-protection of structures. A proper semi-active control strategy can significantly increase structural ability to absorb impact-type loads and damp the resulting vibrations. Discussed systems constitute a new class of smart structures capable of a real-time identification of loads and vibration patterns, followed by a low-cost optimum absorption of the energy by structural adaptation. Given the always surging quest for safety, such systems have a great potential for practical applications (in landing gears, road barriers, space structures, etc.). Compared to passive systems, their better performance can be attributed to the paradigm of self-adaptivity, which is ubiquitous in nature, but still sparsely applied in structural engineering. Being in the early stages of development, their ultimate success depends on a concerted effort in facing a number of challenges. This contribution discusses some of the important problems, including these of a conceptual, technological, methodological and software engineering nature.

Keywords:

adaptive impact absorption, smart structures, semi-active control, safety engineering

Affiliations:
Jankowski Ł.-IPPT PAN
Graczykowski C.-IPPT PAN
Pawłowski P.-IPPT PAN
Mikułowski G.-IPPT PAN
Ostrowski M.-IPPT PAN
Popławski B.-IPPT PAN
Faraj R.-IPPT PAN
Suwała G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
4.Suwała G., Knap L., Holnicki-Szulc J., Prestressing for local isolation of forced vibrations, EACS2016, 6th European Conference on Structural Control, 2016-07-11/07-13, Sheffield (GB), pp.1-8, 2016
Abstract:

The problem of dynamic response stabilization is a crucial issue in many engineering applications or structures subjected to an external source of excitation or dynamic load. At present, owing predominantly to advances in measurement technology, microprocessor control and development of smart materials it is possible to solve many of these problems. Semi-active or active damping systems, which are used to improving structure response, requires additional dampers or absorbers. Contrary, in the article we present approach of suppressing local vibration via introducing initial prestressing into the chosen element or elements of the structure. In that way it is possible to change properties of the structure and its modes of vibrations. We present the results of numerical simulations of the mechanical structure subjected to external excitations. Our results show that by introducing prestressing it is possible to significantly influence on eigenfrequances and eigenmodes. Also effectiveness of vibration amplitudes reduction can be significantly larger, at least one order of magnitude larger.

Keywords:

local suppresion of forced vibrations, prestressing, sensitivity analysis and prestress optimization

Affiliations:
Suwała G.-IPPT PAN
Knap L.-Warsaw University of Technology (PL)
Holnicki-Szulc J.-IPPT PAN
5.Jankowski Ł., Holnicki-Szulc J., Mróz A., A new strategy for adaptive impact absorption (AIA), SMART 2015, 7th ECCOMAS Thematic Conference on Smart Structures and Materials, 2015-06-03/06-05, Ponta Delgada (PT), pp.1-17, 2015
Abstract:

This contribution presents and overviews a new class of strategies for Adaptive Impact Absorption (AIA) and illustrates a selected strategy in a numerical example. The proposed strategies are based on a challenging approach of a semi-active management and dissipation of structural kinetic and potential energy. The entire process of AIA is considered, including its two main phases: semi-actively controlled reception of an impact and semi-actively controlled damping of the resulting structural vibrations. Management and redistribution of impact energy seems to be one of the most promising and challenging problems in the field of AIA, which requires a substantial theoretical progress in semi-active control strategies and in structural optimization, besides a technological progress in semi-active actuators.

Keywords:

Adaptive impact absorption, smart structures, adaptive structures, impact energy management, bilinear control, switched systems

Affiliations:
Jankowski Ł.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Mróz A.-IPPT PAN
6.Holnicki-Szulc J., Sekuła K., Graczykowski C., On-line Impact Load Identification for Adaptive Impact Absorption, 6th Conference on Protection of Structures Against Hazards, 2014-10-16/10-17, Tianjin (CN), pp.35-44, 2014
Abstract:

The so-called Adaptive Impact Absorption (AIA) is a research area of safety engineering devoted to problems of shock absorption in various unpredictable scenarios of collisions. It makes use of smart technologies including systems equipped with sensors, controllable dissipaters and specialized tools for signal processing. One of the most challenging problems for AIA systems is on-line identification of impact lo ads, which is crucial for introducing optimum real-time strategy of adaptive impact absorption. This paper presents development of methodology which enables real-time impact load identification. In considered problem a dynamic excitation is generated by a mass M 1 impacting with initial velocity V 0 . An analytical formulation of the problem, corresponding numerical simulations and experimental tests are presented. Two identification algorithms based on measured response of the impacted structure are proposed and thoroughly discussed. Finally, a concept of the AIA device utilizing the idea of detecting device (the so called “impactometer”) is briefly described.

Keywords:

Impact Load Identification, Adaptive Impact Absorption, Real-time Systems

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Sekuła K.-other affiliation
Graczykowski C.-IPPT PAN
7.Mikułowski G., Wiszowaty R., Holnicki-Szulc J., Analysis and thermodynamic modeling of a pneumatic adaptive absorber, 6WCSCM, 6th World Conference on Structural Control and Monitoring, 2014-07-15/07-17, Barcelona (ES), pp.3057-3066, 2014
Abstract:

The objective of this work was to develop a mathematical model of coupled thermodynamic and mechanical processes proceeding in pneumatic, adaptive absorbers under cyclic loadings. The results of the modelling were to be verified versus experimentally obtained data. The analysis was divided into sections devoted to: forces acting on the piston, thermodynamics of the gas in the absorber’s chambers, gas flow through the piezoelectric valve. Three control volumes were distinguished within the absorber’s structure in order to analyze the thermodynamic processes. For each control volume analysis of energy balance, thermodynamic state parameters and heat transfer were performed. A set of equations was formulated for each control volume in order to determine: (1) motion of the piston in relation to the acting forces, (2) the gas state evolution, (3) energy balance within each control volume and (4) heat transfer to the surroundings. The obtained results revealed that the proposed approach to modeling was in good agreement with the data obtained experimentally. The controllability of the absorber was successfully reflected by means of the numerical model outcome.

Affiliations:
Mikułowski G.-IPPT PAN
Wiszowaty R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
8.Mróz A., Holnicki-Szulc J., Biczyk J., Prestress Acumulation-Release for Damping of Impact-Born Vibrations. Numerical Analysis of Simple Frame Structures, 6WCSCM, 6th World Conference on Structural Control and Monitoring, 2014-07-15/07-17, Barcelona (ES), pp.1868-1876, 2014
Abstract:

In this paper a numerical study is presented, witch tailors so-called Prestress Accumulation-Relase (PAR) Strategy to mitigate free vibrations of frame structures. First, the concept of proposed semi-active technique is outlined and possible applications are specified. In the second part of the work a parametric study is discussed, which illustrates the potential of the method for mitigation of free vibrations induced by impact or other initial load scenarios. Special attention is given to the energy balance including all relevant contributions to the total energy of the considered dissipative system. The proposed technique shows a very high potential in mitigation of free vibrations, exceeding 99% of the reference amplitude after 5 cycles of vibration.

Affiliations:
Mróz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Biczyk J.-Adaptronica Sp. z o. o. (PL)
9.Świercz A., Holnicki-Szulc J., Kołakowski P., Impact loads for structural damage identification, 7th European Workshop on Structural Health Monitoring, 2014-07-08/07-11, Nantes (FR), pp.2115-2122, 2014
Abstract:

In this paper we numerically study simple two dimensional frame structure loaded by impulse-like excitations. Various configurations of time duration of a single impact load and location of this excitation are investigated. The aim of this research is to indicate the best possible load case for identification of a specific damage. Two kinds of structural modifications are considered. The first group concerns the element stiffness changes (axial and bending) which can be simulated by alternating the Young‘s modulus. The second group covers the modifications of stiffness nodal connections. In a numerical model, these kinds of defects can be implemented using rotational spring with different characteristics. Obtained selected responses for the original and modified structure are numerically generated.

Keywords:

structural modification, semi-rigid joint, virtual distortion method, gradient-based optimization

Affiliations:
Świercz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Kołakowski P.-IPPT PAN
10.Knor G., Holnicki-Szulc J., Identification, modeling and control of temperature fields in concrete structures, 2nd International Conference on CIVIL ENGINEERING TOWARDS A BETTER ENVIRONMENT, 2013-05-26/05-29, Covilhã (PT), pp.179-192, 2013
11.Świercz A., Kołakowski P., Holnicki-Szulc J., Olkowicz D., Identification of semi-rigid joints in frame structures, SMART2013, 6th ECCOMAS Thematic Conference on Smart Structures and Materials, 2013-09-03/09-06, Turyn (IT), pp.1-12, 2013
Abstract:

This study presents the numerical analysis and experimental tests of a planar frame structure with semi-rigid joints. Based on structural responses the identification of nodal parameters is performed.

Keywords:

Frame structures, Semi-rigid joints, Inverse problem, SHM

Affiliations:
Świercz A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Olkowicz D.-IPPT PAN
12.Pawłowski P., Graczykowski C., Holnicki-Szulc J., Ario I., Smart, deployable skeletal structures for safety engineering, SMART2013, 6th ECCOMAS Thematic Conference on Smart Structures and Materials, 2013-09-03/09-06, Turyn (IT), pp.1-10, 2013
Abstract:

This contribution presents the concept of smart, deployable skeletal structures along with existing and prospective applications. The first part introduce s the concept of multi-folding, which is the basis for the design of all smart deployable skeletal structures. In the second part three diverse innovative applications are described: deployable mobile bridge, adaptive impact absorber and controllable valve.

Keywords:

smart skeletal structures, adaptive impact absorption, safety engineering

Affiliations:
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Ario I.-Hiroshima University (JP)
13.Knor G., Holnicki-Szulc J., Glinicki M.A., Determination of thermal properties of hardening concrete containing high calcium fly ash, 14th International Conference Structural Faults and Repair, 2012-07-03/07-05, Edinburgh (GB), pp.1-10, 2012
Abstract:

A numerical and experimental investigation on thermal behavior of young concrete is presented. It haseen performed to establish the range of possible applications of concrete containing non-standard addition of reactive high calcium fly ash. The proposed model of temperature distribution in hardening concrete is based on the non-linear IH TP (inverse heat transfer problem ) solution. Changes in properties of concrete during setting and hardening are included in the model. The proposed approach consists of several stages. First the temperature measurements in a one-dimensional form are performed using real size concrete materials. Then the method of lines is used to solve the one dimensional heat equation. The results are treated as an input to IHTP for determination of thermal properties of concrete: specific heat capacity, thermal conductivity and heat of hardening. To solve IHTP the pattern search method is used, which does not require the calculation of the gradient of the objective function. In the third step the direct heat conduction problem is solved. Own, based on finite element method, software TMC (Thermal & Mechanical modeling of Concrete) is used to predict temperature field. The obtained numerical results have been compared with experimentally measured temperature in concrete and a fair agreement has been found

Keywords:

early age concrete, inverse problem, heat transfer, high calcium fly ash

Affiliations:
Knor G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Glinicki M.A.-IPPT PAN
14.Holnicki-Szulc J., Graczykowski C., Grzędziński J., Mikułowski G., Mróz A., Pawłowski P., Wiszowaty R., Adaptive Impact Absorption - the concept, simulations and potential applications, 4th International Conference on Protection of Structures Against Hazards, 2012-11-15/11-16, , pp.1-16, 2012
Abstract:

Adaptive Impact Absorption focuses on adaptation of energy absorbing structures to actual dynamic loading by using system of sensors detecting and identifying impact in advance and semi -active dissipaters with controllable mechanical properties which enable change of system dynamic characteristics in real time. The article present s a review of research conducted at the Department of Intelligent Technologies of the Institute of Fundamental Technological Research dedicated to applications of systems for Adaptive Impact Absorption. Wide range of presented examples covers pneumatic landing gears, bumpers for offshore towers, wind turbine blade-hub connections and d protective barriers for automotive applications.

Keywords:

adaptive impact absorption, safety engineering, smart structures, optimal control

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Graczykowski C.-IPPT PAN
Grzędziński J.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Pawłowski P.-IPPT PAN
Wiszowaty R.-IPPT PAN
15.Mikułowski G., Ostrowski M., Holnicki-Szulc J., Overview of High Performance Actuator and High Performance Valve Technologies, ACTUATOR 2012, International Conference on new actuators, 2012-06-18/06-20, Bremen (GE), pp.742-745, 2012
Abstract:

This paper describes concepts of two different technologies developed for control of gas flow in High Performance Actuator (HPA) and control of gas discharge from airbag system through High Performance Valve (HPV). The HPA technology utilizes piezoelectric valve to govern flow in the pneumatic cylinder, used as an impact absorber or smart damper, while the HPV uses membrane surfaces driven by flow and controlled by explosive rings to mode discharge of an airbag system. Both techniques, different in their nature realizes comparatively similar function in flow different scales but similar time scale, where each cycle of operation is near single milliseconds. The paper also covers experimental results and a simple numerical study on the High Performance Valve (HPV) concept developed for a control of an adaptive inflatable impact energy absorber (gas-bag). Patent pending concept of the HPV is utilizing a flow energy drive method, using the flow energy to move and seal working parts of the valve.

Keywords:

Adaptive devices, Piezo-valve, Airbag, Valve, Explosion, Control

Affiliations:
Mikułowski G.-IPPT PAN
Ostrowski M.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
16.Graczykowski C., Holnicki-Szulc J., Adaptive Fenders for Extreme Off-shore Docking Operations, EACS 2012, 5th European Conference on Structural Control, 2012-06-18/06-20, Genoa (IT), pp.1-8, 2012
Abstract:

Collisions with small service ships are serious dangers for offshore wind turbines. Installing of the adaptive torus-shaped pneumatic fender that surrounds wind turbine tower at water level constitutes on e method of effective protection against such events. Innovative pneumatic fender proposed in this paper contains several internal air-chambers equipped wit h fast inflators and high-performance valves allowing for control of gas migration and release. The system ca n be adapted to various impact scenarios by adjusting the level of initial pressure in each chamber and by controlling transfer of compressed gas during impact. The paper presents numerical simulations of ship collision against wind turbine tower protected by adaptive fender conducted by means of FEM-based software. Several control strategies aimed at mitigating tower and ship response are introduced. Performed feasibility study proves that inflatable structure can effectively protect the wind turbine tower and the ship against serious damages.

Keywords:

Adaptive Inflatable Structures (AIS), pneumatic fenders, Adaptive Impact Absorption (AIA), offshore collisions, off-shore docking operations

Affiliations:
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
17.Świercz A, Kołakowski P., Holnicki-Szulc J., Impact-Load-Based Damage Identification in Joints of Skeletal Structures, EWSHM 2012, 6th European workshop on Structural Health Monitoring, 2012-07-03/07-06, Dresden (GE), Vol.1, pp.841-848, 2012
Abstract:

The nodal connections in the standard analysis of frame structures are idealized assuming either pinned or fully rigid joints. State of such structural connections is highly important for safe operation of skeletal structures. In this work, the authors propose modeling, detection and identification of semi-rigid joints, i.e. nodal connections covering the range between pinned and fully rigid joints. The presented approach is based on the Virtual Distortion Method (VDM) and dedicated to statically or dynamically loaded two-dimensional frame structures.

Affiliations:
Świercz A-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
18.Świercz A., Kołakowski P., Holnicki-Szulc J., Monitoring of progressive collapse of skeletal structures, DAMAS, 9th International Conference on Damage Assessment of Structures, 2011-07-11/07-13, Oxford (GB), DOI: 10.1088/1742-6596/305/1/012133, Vol.305, No.1, pp.012133-1-8, 2011
Abstract:

The authors propose an idea of monitoring the state of skeletal structures of high importance (e.g. roof structures over large area buildings) with the aim of identification of slowly-developing plastic zones. This is formulated as an inverse problem within the framework of the Virtual Distortion Method, which was used previously to identify stiffness/mass modifications in similar manner. Permanent plastic strains developed in a truss element can be modeled by an initial strain (virtual distortion) introduced to the structure. The formation of subsequent plastic zones in the structure is assumed to be slow. Consequently, the design variable (plastic strain) is time-independent, which makes the inverse analysis efficient. This article presents problem formulation and numerical algorithm for identification of the plastic strains in truss structures. The identification relies on gradient-based optimization. A numerical example is included to demonstrate the efficiency of the algorithm.

Affiliations:
Świercz A.-IPPT PAN
Kołakowski P.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
19.Holnicki-Szulc J., Graczykowski C., Mikułowski G., Mróz A., Ostrowski M., Wiszowaty R., Adaptive impact absorption for safety engineering, 9th International Conference on Shock & Impact Loads on Structures, 2011-11-16/11-18, Fukuoka (JP), pp.373-385, 2011
Abstract:

Adaptive Impact Absorption focuses on active adaptation of energy absorbing structures to actual dynamic loading by using system of sensors detecting and identifying impact in advance and controllable semi-active dissipaters with high ability of adaptation. The article presents a review of research carried out in the Department of Intelligent Technologies of Institute of Fundamental Technological Research dedicated to applications of systems for adaptive impact absorption. Wide range of presented examples covers pneumatic landing gears, adaptive crashworthy structures, wind turbine blade-hub connections and flow control based airbags for maritime and aeronautical applications.

Keywords:

smart structures, adaptive structures, Adaptive Impact Absorption, crashworthiness, safety engineering

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Graczykowski C.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Ostrowski M.-IPPT PAN
Wiszowaty R.-IPPT PAN
20.Holnicki-Szulc J., Jankowski Ł., Smart technologies for structural safety, CMM 2011, 19th International Conference on Computer Methods in Mechanics, 2011-05-09/05-12, Warszawa (PL), pp.057-1-7, 2011
Abstract:

This paper presents the concept of smart structures dedicated to improving structural safety in case of unpredictable impact loadings. The concept is developed by bringing together two different ideas: adaptive impact absorption (AIA) and structural health monitoring (SHM). The potential for safe energy dissipation is maximized by optimum structural adaptation to impact loading parameters, for which the AIA subsystem is responsible. The SHM subsystem is used for on-line identification of impact type loadings, which is necessary in order to trigger optimum adaptation, as well as for post-impact damage assessment. Both subsystems depend on smart material technologies: optimum adaptation can be implemented through a small number of optimally distributed structural fuses, that is elements with controllable yield stresses, which can be implemented using magneto-rheological fluids, while the health and loading monitoring require a reliable sensing system, e.g. based on piezo-materials. The paper presents the general concept, provides a literature review and discusses in detail the challenges related to the SHM part.

Keywords:

adaptivity, crashworthiness, inverse problems, structural monitoring, smart materials

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Jankowski Ł.-IPPT PAN
21.Graczykowski C., Mikułowski G., Holnicki-Szulc J., Adaptive impact absorption – a benchmark and an example absorber, SMART2011, 5th ECCOMAS Thematic Conference on Smart Structures and Materials, 2011-07-06/07-08, Saarbrücken (DE), pp.663-668, 2011
Abstract:

This paper proposes a benchmark for conceptual devices dedicated to adaptive impact absorption (AIA) and protection against shock excitations. The problem of the exploitation impacts is present in a wide class of applications, and particularly where direction of the object’s movement is well-defined, for example: precise docking systems, rail car buffers or landing gear shock absorbers. In those applications the objective is to equalize the values of velocities of the bodies in order to minimize the deceleration peak. The proposed benchmark establishes a comparing procedure for materials or devices in the field of AIA in a simplified regime in order to improve the comparability of the solutions. A drop test device is proposed to be used for testing the proposed devices in the predefined experimental regime. Besides, an example of the adaptive absorber is presented.

Affiliations:
Graczykowski C.-IPPT PAN
Mikułowski G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
22.Graczykowski C., Sekuła K., Holnicki-Szulc J., Real-time identification of impact load parameters, SMART2011, 5th ECCOMAS Thematic Conference on Smart Structures and Materials, 2011-07-06/07-08, Saarbrücken (DE), pp.544-551, 2011
23.Świercz A., Kołakowski P., Holnicki-Szulc J., Damage identification in structural joints using the Virtual Distortion Method, SMART2011, 5th ECCOMAS Thematic Conference on Smart Structures and Materials, 2011-07-06/07-08, Saarbrücken (DE), pp.1-6, 2011
24.Knor G., Holnicki-Szulc J., Identify heat of hardening and transient thermal properties in concrete structures, SMART2011, 5th ECCOMAS Thematic Conference on Smart Structures and Materials, 2011-07-06/07-08, Saarbrücken (DE), pp.87-94, 2011
25.Świercz A., Kołakowski P., Holnicki-Szulc J., Sensitivity-based Structural Health Monitoring of Skeletal Structures, 11th Workshop on Smart Diagnostics of Structures, 2010-10-18/10-20, Kraków (PL), pp.1-8, 2010
26.Świercz A., Kołakowski P., Holnicki-Szulc J., Monitorowanie postępującego rozwoju stref plastycznych w konstrukcjach szkieletowych, 56 Konferencja Naukowa KILiW PAN i KN PZITB, 2010-09-19/09-24, Kielce-Krynica (PL), pp.1-11, 2010
27.Mróz M., Jankowski Ł., Holnicki-Szulc J., VDM-based identification of localized, damage induced damping, EWSHM 2010, 5th European workshop on Structural Health Monitoring, 2010-06-29/07-02, Sorrento (IT), pp.988-993, 2010
Abstract:

This paper presents and experimentally verifies a method for identification of structural damage. The work is focused on such damage types as cracks, delamination or excessive allowances, which may not cause significant stiffness degradation but induce noticeable additional damping. Damaged elements are located and the damage is assessed in terms of the damage-induced damping and also the stiffness degradation. The Virtual Distortion Method (VDM) is used for modeling of the modifications.

Affiliations:
Mróz M.-other affiliation
Jankowski Ł.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
28.Pawłowski P., Holnicki-Szulc J., Struktury mechaniczne typu harmonijkowego (multifolding) w adaptacyjnych układach dyssypacji energii, XXXVII Ogólnopolskie Sympozjum Diagnostyka Maszyn, 2010-03-08/03-13, Wisła (PL), pp.1-8, 2010
29.Mikułowski G., Pawłowski P., Graczykowski C., Wiszowaty R., Holnicki-Szulc J., On a pneumatic adaptive landing gear system for a small aerial vehicle, SMART 2009, 4th ECCOMAS Thematic Conference on Smart Structures and Materials, 2009-07-13/07-15, Porto (PT), pp.1-9, 2009
Abstract:

The class of ultra-light aircraft becomes more and more popular among the enthusiasts of aviation due to low formal requirements of getting the pilot license and low costs of the equipment. Therefore, the training of the pilots starts to be a large-scale task. One of the most difficult operation for the inexperienced pilots is touch-down and it often happens to strike the ground with a high sink speed. In consequence the training machines are endangered of fast structural damage. A potential solution would be to mount a system of adaptive landing gear for light aircraft with a capability of recognition of the actual landing impact and tuning the landing struts in order to conduct the smoothest landing operation possible. In the case of the ultra-light aircraft class the weight of the components is the crucial task and therefore the low-weight pneumatic system is proposed for these application.
The paper presents a concept of an adaptive landing system and adequate control strategy for a small aerial vehicle. The objective of the work was to develop a fully functional model of the landing system and experimental verification of it. The system is based on the new pneumatic impact absorbers actuated via piezo-stacks. The concept assumes designing of the system with the capability of adaptation to actual energy of impact scenario identified by a dedicated sensing system for impact energy recognition.
The designed control system was dedicated to process the data from the system of impact energy recognition in order to perform the optimal landing scenario. The objective of the control strategy was minimization of the structure’s deceleration peaks during the touchdown.
The presented results consist of numerical analysis of the adopted strategy of control and experimental verification of the concept on the dedicated experimental device. The results proved that the proposed method allowed minimization of the maximal deceleration level acting on the demonstrator.

Affiliations:
Mikułowski G.-IPPT PAN
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Wiszowaty R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
30.Mróz M., Jankowski Ł., Holnicki-Szulc J., A VDM-based method for fast reanalysis and identification of structural damping, WCSMO-8, 8th World Congress on Structural and Multidisciplinary Optimization, 2009-06-01/06-05, Lisbon (PT), pp.1-9, 2009
Abstract:

This paper proposes a new approach for modeling and identification of damping in linear structures. The approach is based on the Virtual Distortion Method (VDM), which is a reanalysis methodology for fast modeling and identification of structural parameters. The VDM is extended in the sense of considering structural damping in frequency domain. The assumed damping model is a modified version of the proportional damping, which allows to distinguish between and to modify independently the damping properties of each element and in each degree of freedom. In this way, a precise formulation of the task of remodeling of damping is possible. Moreover, the proposed approach is used to state and solve the (basically nonlinear) inverse problem of identification of material damping by decomposing it into two linear subproblems.

Keywords:

damping identification, structural reanalysis, Virtual Distortion Method (VDM)

Affiliations:
Mróz M.-other affiliation
Jankowski Ł.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
31.Flont P., Holnicki-Szulc J., Adaptive railway track with improved dynamic response, WCSMO-2, 2nd World Congress of Structural and Multidisciplinary Optimization, 1997-05-26/05-30, Zakopane (PL), Vol.4, pp.339-344, 1997

Conference abstracts
1.Chikahiro Y., Ario I., Adachi K., Shimizu S., Zenzai S., Pawłowski P., Graczykowski C., Holnicki-Szulc J., FUNDAMENTAL STUDY ON DYNAMIC PROPERTY OF SCISSORING BRIDGE FOR DISASTER RELIEF, ENOC 2017, 9th European Nonlinear Dynamics Conference, 2017-06-25/06-30, Budapest (HU), pp.1-2, 2017
Abstract:

The world has seen many kinds of natural disasters, which have critically influenced the residents’ lives by causing damage to infrastructure. To realize rapid rescue efforts in an emergency situation,we propose a deployable emergency bridge, called Mobile Bridge TM [1], based on the theory of foldable structures[2]and the concept of Multi-Folding Microstructures (MFM)[3]. The current research presents the fundamental,numerical and experimental results obtained for the pedestrian and vehicle Mobile Bridges. In this paper, it is considered the localized linearization problem with the fixed an angle although this bridge contains a geometrical nonlinearity of scissors structure.Additionally, a seismic response analysis is conducted for the case where the Mobile Bridge is used in the disaster area as an emergency bridge. This allows for a better and safer structural design of the Mobile Bridge, which is patented in [4],[5].

Affiliations:
Chikahiro Y.-Shinshu University (JP)
Ario I.-Hiroshima University (JP)
Adachi K.-Hiroshima University (JP)
Shimizu S.-Shinshu University (JP)
Zenzai S.-Shinshu University (JP)
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
2.Faraj R., Graczykowski C., Holnicki-Szulc J., Investigations on adaptable and adaptive impact absorption, ICAST2017, The 28th International Conference on Adaptive Structures and Technologies, 2017-10-08/10-11, Kraków (PL), pp.1, 2017
3.Faraj R., Graczykowski C., Holnicki-Szulc J., Knap L., Seńko J., Adaptable pneumatic shock-absorber, SMART 2017, 8th Conference on Smart Structures and Materials, 2017-06-05/06-08, Madrid (ES), pp.1, 2017
4.Faraj R., Holnicki-Szulc J., Knap L., Seńko J., Mitigation of the structure response based on inertial shock-absorber, EACS2016, 6th European Conference on Structural Control, 2016-07-11/07-13, Sheffield (GB), pp.1, 2016
Abstract:

The goal of this paper is to present further development of the inertial shock-absorber called SPINMAN. Application of the device in mitigation of structures response is investigated and selected case study is discussed. The specific construction and operation of the device is introduced and explained. In reference to the impact absorption problems, the SPIN-MAN is a concept of adaptive inerter device with two phases of operation. The first of them includes energy absorption and accumulation. External energy of the load is converted to kinetic energy of rotational motion of the mass. During the second phase, accumulated energy is dissipated by inverse spinning of the second mass powered by the remaining part of the impact energy. To obtain this type of operation, special switchable actuators are used. Applicability of the device in mitigation of impact-born structure response, especially in case of space systems, is investigated. General concept of the device construction and operation is adjusted to meet the requirements for space systems. This results in a fluidless, passive-like solution but adaptable to the load conditions. Tuning of the shock-absorber may be realized by manual or easily automated mechanical adjustments. Effectiveness of the solution is based on the specific on/off type of control, which is responsible for the optimal energy flow in the system and efficient dissipation of impact energy inside the SPIN-MAN. Results of numerical simulations confirmed quick and effective operation of this device.

Keywords:

structure response mitigation, adaptive impact absorption, adaptive inerter, semi-active control, shock-absorber

Affiliations:
Faraj R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Knap L.-Warsaw University of Technology (PL)
Seńko J.-Warsaw University of Technology (PL)
5.Chikahiro Y., Ario I., Holnicki-Szulc J., Pawłowski P., Graczykowski C., A Study on Optimal Reinforcement of Scissor Type of Bridge with Additional Strut Members, ICCEE 2016, International Conference on Civil and Environmental Engineering, 2016-10-17/10-19, Hiroshima (JP), pp.1-2, 2016
Keywords:

scissor type of bridge, emergency bridge, strut reinforcement, sectional optimization

Affiliations:
Chikahiro Y.-Shinshu University (JP)
Ario I.-Hiroshima University (JP)
Holnicki-Szulc J.-IPPT PAN
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
6.Holnicki-Szulc J., Jankowski Ł., Mróz A., Mitigation of impact-born vibrations, Euromech Colloquium [562] – Stability and Control of Nonlinear Vibrating Systems, 2015-05-24/05-28, Sperlonga (IT), pp.28-29, 2015
7.Faraj R., Holnicki-Szulc J., Adaptive inertial shock-absorber for vibration damping, ICoEV-2015, ICoEV 2015 : IFTOMM International Conference on Engineering Vibration 2015, 2015-09-07/09-10, Ljubljana (SI), pp.1, 2015
Keywords:

Adaptive Impact Absorption, shock-absorber, vibration damping

Affiliations:
Faraj R.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
8.Holnicki-Szulc J., Faraj R., Graczykowski C., Jankowski Ł., Mikułowski G., Mróz A., Ostrowski M., Pawłowski P., Wiszowaty R., Adaptive impact absorption - potential applications for safety engineering, SMART 2015, 7th ECCOMAS Thematic Conference on Smart Structures and Materials, 2015-06-03/06-05, Ponta Delgada (PT), pp.1-2, 2015
Keywords:

Smart And Adaptive Structures, Adaptive Impact Absorption, Safety Engineering

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Faraj R.-IPPT PAN
Graczykowski C.-IPPT PAN
Jankowski Ł.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Ostrowski M.-IPPT PAN
Pawłowski P.-IPPT PAN
Wiszowaty R.-IPPT PAN
9.Pawłowski P., Graczykowski C., Holnicki-Szulc J., Bistable Elements for Application in Controllable High Performance Valves, 6WCSCM, 6th World Conference on Structural Control and Monitoring, 2014-07-15/07-17, Barcelona (ES), pp.1, 2014
Keywords:

high performance valve, bistable elements, snap-through, adaptive impact absorption

Affiliations:
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
10.Chikahiro Y., Ario I., Nakazawa M., Ono S., Holnicki-Szulc J., Pawłowski P., Graczykowski C., Structural Analysis and Experimental Study for realsized MB Travelable Vehicles, ENOC 2014, 8th European Nonlinear Dynamics Conference, 2014-07-06/07-11, Wiedeń (AT), pp.1-2, 2014
Abstract:

Many natural disasters such as earthquakes, floods, torrential rains occur around the world, and we to undertake quick rescue actions. However, there are many recovery problems because of the occurrence of secondary disasters at each rescue worksite.So, from the previous study of optimal structures and control regulation of MFM[1]-[2], we propose a new type of foldable bridge with scissors structure called Mobile Bridge[3]. Applying scissors mechanism to bridge form, Mobile Bridge provides not only mobility but also good structural performance, because the whole bridge can be expand or fold quickly. In this paper, we discuss the vehicles passing test on the real scale Mobile Bridge in order to evaluate the design method and application limits.

Keywords:

Mobile Bridge, deployable structures, temporary bridges, scissors-type structures

Affiliations:
Chikahiro Y.-Shinshu University (JP)
Ario I.-Hiroshima University (JP)
Nakazawa M.-Tohoku Gakuin University (JP)
Ono S.-Japan Construction Method and Machinery Research Institute (JP)
Holnicki-Szulc J.-IPPT PAN
Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
11.Knor G., Holnicki-Szulc J., Modelling Propagation of Lamb Waves in CFRP Plates for Damage Detection, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.229-230, 2014
12.Flaszyński P., Doerffer P., Mikułowski G., Holnicki-Szulc J., Numerical Simulations for Transonic Flow in Control Valve, 11th International Symposium on Experimental and Computational Aerothermodynamics of Internal Flows, 2013-05-06/06-11, Shenzhen (CN), pp.1-6, 2013
Abstract:

Results of numerical simulations for transonic flow in control valve are presented. The valve is the main part of an adaptive pneumatic shock absorber. Flow structure in the valve domain and the influence of the flow non-uniformity in the valve on a mass flow rate is investigated. Numerical simulation results are compared with experimental data.

Keywords:

pneumatic valve, transonic flow, numerical simulations

Affiliations:
Flaszyński P.-Institute of Fluid Flow Machinery, Polish Academy of Sciences (PL)
Doerffer P.-Institute of Fluid Flow Machinery, Polish Academy of Sciences (PL)
Mikułowski G.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
13.Holnicki-Szulc J., Jankowski Ł., VDM in inverse problems of safety engineering, IPM 2013, ECCOMAS Thematic Conference: International Conference IPM 2013 on Inverse Problems in Mechanics of Structures and Materials, 2013-04-24/04-27, Baranów Sandomierski (PL), pp.21-22, 2013
Abstract:

The virtual distortion method (VDM) [1] is a quick reanalysis method developed in the Institute of Fundamental Technological Research (IPPT PAN). Earlier related work includes the research of professors Nowacki, Eshelby, Kroener, Argyris, Maier, Majid and Celik, and others; for references see [1, 2]. The term virtual distrotion has been coined in 1989 [3], and the concept of the influence matrix has been proposed, which is the distinguishing factor of the VDM that provides for its effectiveness. This contribution presents the background and formulation of the method and reviews its applications in safety engineering.

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Jankowski Ł.-IPPT PAN
14.Holnicki-Szulc J., Graczykowski C, Pawłowski P., Ario I., High Performance Valve for Adaptive Pneumatic Impact Absorbers, SolMech 2012, 38th Solid Mechanics Conference, 2012-08-27/08-31, Warszawa (PL), pp.1-2, 2012
Abstract:

Dissipation of the energy in mechanical systems is a vitally important engineering and scientific problem. Current stringent safety requirements enforce substantial change of methods of structural design and application of new solutions and technologies which ensure structural integrity.
Currently applied passive safety systems are typically not equipped with control devices. Their dynamic characteristics remains unaltered and thus it is well adjusted to a narrow range of actual loadings. In case of impact loading, it is highly advantageous to apply systems of Adaptive Impact Absorption (AIA), which are capable of fast change of the dynamic characteristics. Recent fast development of the material technologies and, in particular, development in the field of functional (smart) materials and electronic measurement and control systems had created new possibilities of practical applications of the AIA systems.
During the adaptation process the choice of optimal control strategy is followed by adjustment of the dynamic characteristics of adaptive elements of the absorber. These elements can entirely made of functional materials (as e.g. shape memory alloys) or, alternatively, they can be equipped with controllable devices, so-called structural fuses, which provide controlled response of the element. Depending on type of applied control, the changes of structural parameters occur only once (usually before impact) or they are controlled in real time during the impact process.
The systems of Adaptive Impact Absorption can be effectively used to increase the level of safety during the action of the impact loading. In particular, very promising results are obtained with the use of adaptive inflatable structures. However, the possibilities of their practical applications are limited due to the lack methods allowing for the efficient and fast control of the gas flow during impact.
The presented work focuses on the pneumatic adaptive impact absorbing system equipped with a novel, high performance valve, which utilizes bistable snap-through effect. Snap-through effects are mainly the subject of theoretical analysis and they do not find many practical engineering applications.

Keywords:

smart structures, high performance valves, adaptive pneumatic systems, adaptive impact absorption

Affiliations:
Holnicki-Szulc J.-IPPT PAN
Graczykowski C-IPPT PAN
Pawłowski P.-IPPT PAN
Ario I.-Hiroshima University (JP)

Patents
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
419786
2016-12-13
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Holnicki-Szulc J., Faraj R., Pawłowski P., Wołejsza Z., Kaźmierczak K., Hinc K.
Rozkładana konstrukcja sterowca stratosferycznego i sposób zmiany objętości, zwłaszcza rozkładanej konstrukcji sterowca stratosferycznego
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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666285
2016-10-28
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Faraj R., Graczykowski C., Holnicki-Szulc J.
Absorber pneumatyczny o adaptowalnej charakterystyce odpowiedzi, wypełniony powietrzem atmosferycznym, zwłaszcza do łagodzenia przyziemienia zrzucanych ładunków
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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415443
2015-12-21
BUP 14/2017
2017-07-03
Doerffer P., Flaszyński P., Mikułowski G., Holnicki-Szulc J.
Zespół płyt zaworowych
PL, Instytut Maszyn Przepływowych im. Roberta Szewalskiego PAN, Instytut Podstawowych Problemów Techniki PAN
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415131
2015-12-04
BUP 12/2017
2017-06-05
Holnicki-Szulc J., Knap L., Faraj R., Seńko J.
Amortyzator śrubowy z krótkimi łopatkami i amortyzator śrubowy z długimi łopatkami
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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414970
2015-11-26
BUP 12/2017
2017-06-05
Holnicki-Szulc J., Knap L., Faraj R., Seńko J.
Amortyzator śrubowo-rotacyjny z jednym wejściem i amortyzator śrubowo-rotacyjny z dwoma wejściami
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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414367
2015-10-14
BUP 9/2017
2017-04-24
Holnicki-Szulc J., Knap L., Seńko J., Faraj R.
Urządzenie do tłumienia udaru i sposób tłumienia udaru
PL, Instytut Podstawowych Problemów techniki PAN, Adaptronica Sp z o.o.
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414374
2015-10-14
BUP 9/2017
2017-04-24
Mróz A., Biczyk J., Holnicki-Szulc J.
Sterowalne sprzęgło oraz jego zastosowanie
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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411237
2015-02-11
BUP 17/2016
2016-08-16
Holnicki-Szulc J., Mróz A., Faraj R.
Sposób tłumienia drgań wywołanych udarem mechanicznym, oraz tłumik bezwładnościowy
PL, Instytut Podstawowych Problemów techniki PAN, Adaptronica Sp z o.o.
227058
WUP 10/2017
2017-10-31
410275
2014-11-27
BUP 12/16
2016-06-06
Holnicki-Szulc J., Faraj R., Mróz A.
Opakowanie amortyzujące uderzenia
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
225398
WUP 04/17
2016-10-21
409600
2014-09-25
BUP 7/2016
2016-03-29
Holnicki-Szulc J., Mróz A., Faraj R.
Lądownik do bezpiecznych zrzutów z powietrza
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
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407763
2014-04-01
BUP 21/2015
2015-10-12
Holnicki-Szulc J., Mróz A., Biczyk J.
Półaktywny węzeł zwłaszcza do tłumienia drgań.
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica sp z o.o.
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407160
2014-02-12
BUP 17/2015
2015-08-17
Graczykowski C., Pawłowski P., Holnicki-Szulc J.
Sterowalny zawór bistabilny zwłaszcza do gazowego absorbera energii
PL, Instytut Podstawowych Problemów Techniki PAN
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397310
2011-12-09
BUP 12/13
2013-06-10
Świercz A., Holnicki-Szulc J., Kołakowski P.
Sposób wyznaczania obciążeń w górotworze
PL, Instytut Podstawowych Problemów Techniki PAN, Adaptronica Sp. z o.o.
222132
WUP 07/16
2016-07-29
397312
2011-12-09
BUP 12/13
2013-06-10
Świercz A., Mikułowski G., Wiszowaty R., Holnicki-Szulc J., Kołakowski P., Graczykowski C.
Sposób generowania wstępnie zaprojektowanego udarowego obciażania konstrukcji oraz urzadzenie do generowania wstępnie zaprojektowanego obciążania konstrukcji
PL, Adaptronica Sp z o.o., Instytut Podstawowych Problemów Techniki PAN
221709
WUP 05/16
2016-05-31
391633
2010-06-26
BUP 01/12
2012-01-02
Orłowska A., Kołakowski P., Holnicki-Szulc J.
Sposób wykrywania pęknięć i rozwarstwień w elementach konstrukcji i układ elektryczny do wykrywania pęknięć i rozwarstwień w elementach konstrukcji
PL, Adaptronika Sp z o.o.
219986
WUP 08/15
2015-08-31
391629
2010-06-25
BUP 01/12
2012-01-02
Kołakowski P., Sala D., Holnicki-Szulc J.
Sposób wykrywania wycieków w sieci dystrybucji do transportu cieczy
PL, Adaptronica Sp. z o.o.
218470
WUP 12/14
2014-12-31
390194
2010-01-28
BUP 16/11
2011-08-01
Wiszowaty R., Graczykowski C., Sekuła K., Holnicki-Szulc J.
Sposób identyfikacji prędkości zderzenia, masy oraz energii kinetycznej obiektu uderzającego w przeszkodę i urządzenie do identyfikacji prędkości zderzenia, masy oraz energii kinetycznej obiektu uderzającego w przeszkodę
PL, Adaptronica Sp z o.o.
219996
WUP 08/15
2015-08-31
387685
2009-04-02
BUP 21/10
2010-10-11
Orłowska A., Kołakowski P., Holnicki-Szulc J.
Sposób wykrywania delaminacji struktur kompozytowych i układ do wykrywania delaminacji struktur kompozytowych
PL, Adaptronica Sp. z o.o., Contec A. Holnicki W. Szała Spółka Jawna
214723
WUP 09/13
2013-09-30
357761
2002-12-13
BUP 12/04
2004-06-14
Holnicki-Szulc J., Chmielewski R.
Sposób i układ sterowania sztywnością i zdolnością do dyssypacji energii cienkościennej belki wielomodułowej oraz cienkościenna belka wielomodułowa
PL, Instytut Podstawowych Problemów Techniki PAN
210382
WUP 01/12
2012-01-31
316888
1996-11-07
BUP 10/98
1998-05-11
Holnicki-Szulc J.
Układ do aktywnego korygowania deformacji toru kolejowego na mostach
PL, Instytut Podstawowych Problemów Techniki PAN
182393
WUP 12/01
2001-12-31