mgr inż. Arkadiusz Mróz


Doktorat
2013-04-28Adaptacyjna absorpcja obciążeń od ekstremalnych podmuchów wiatru w turbinach wiatrowych 
promotor -- dr hab. inż. Janusz Grzędziński, IPPT PAN
658
 
Ostatnie publikacje
1.Popławski B., Mikułowski G., Mróz A., Jankowski Ł., Decentralized semi-active damping of free structural vibrations by means of structural nodes with an on/off ability to transmit moments, MECHANICAL SYSTEMS AND SIGNAL PROCESSING, ISSN: 0888-3270, DOI: 10.1016/j.ymssp.2017.08.012, Vol.100, pp.926-939, 2018

Streszczenie:

This paper proposes, tests numerically and verifies experimentally a decentralized control algorithm with local feedback for semi-active mitigation of free vibrations in frame structures. The algorithm aims at transferring the vibration energy of low-order, lightly-damped structural modes into high-frequency modes of vibration, where it is quickly damped by natural mechanisms of material damping. Such an approach to mitigation of vibrations, known as the prestress-accumulation release (PAR) strategy, has been earlier applied only in global control schemes to the fundamental vibration mode of a cantilever beam. In contrast, the decentralization and local feedback allows the approach proposed here to be applied to more complex frame structures and vibration patterns, where the global control ceases to be intuitively obvious. The actuators (truss–frame nodes with controllable ability to transmit moments) are essentially unblockable hinges that become unblocked only for very short time periods in order to trigger local modal transfer of energy. The paper proposes a computationally simple model of the controllable nodes, specifies the control performance measure, yields basic characteristics of the optimum control, proposes the control algorithm and then tests it in numerical and experimental examples.

Słowa kluczowe:

Damping of vibrations, Smart structures, Semi-active control, Decentralized control, Truss-frame nodes

Afiliacje autorów:

Popławski B.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Jankowski Ł.-IPPT PAN
2.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

Streszczenie:

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.

Afiliacje autorów:

Mróz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Biczyk J.-Adaptronica Sp. z o. o. (PL)
20p.
3.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

Streszczenie:

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.

Słowa kluczowe:

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

Afiliacje autorów:

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
4.Kołakowski P., Mróz A., Sala D, Pawłowski P., Sekuła K., Świercz A., Investigation of dynamic response of a railway bridge equipped with a tailored SHM system, KEY ENGINEERING MATERIALS, ISSN: 1662-9795, DOI: 10.4028/www.scientific.net/KEM.569-570.1068, Vol.569-570, pp.1068-1075, 2013

Streszczenie:

A railway bridge has been the object of investigation in the context of structural health monitoring (SHM). The current work is focused on utilization of experimental data for refining a numerical model of the structure as well as on tests of dynamic excitations using a controlled hydraulic shaker and passing trains. The numerical model has been matched to experimental measurements using experimental modal analysis - classical and operational. The tailored SHM system for monitoring of the bridge consists of 15 piezoelectric strain sensors taking advantage of wireless communication for data transfer. Experimental responses of the bridge collected by the SHM system are confronted with the ones produced by the FE numerical model of the bridge. The long-term objective of the investigation is to elaborate a method for assessment of structural condition and prediction of remaining lifetime of the bridge.

Słowa kluczowe:

Bridge Monitoring, Experimental Measurements, Modal Analysis, Wireless SHM

Afiliacje autorów:

Kołakowski P.-IPPT PAN
Mróz A.-IPPT PAN
Sala D-IPPT PAN
Pawłowski P.-IPPT PAN
Sekuła K.-other affiliation
Świercz A.-IPPT PAN
8p.
5.Grzędziński J., Mróz A., Gust load reduction concept in wind turbines, WIND ENERGY, ISSN: 1095-4244, DOI: 10.1002/we.384, Vol.13, pp.267-274, 2010

Streszczenie:

A concept is presented of gust alleviation in wind turbines by using the blade aerodynamic torsional moment as an actuator for forcing the blade to feather in order to reduce aerodynamic loads. The pitching to feather is implemented through a temporary release of the blade-hub torsional connection after that the blade rotates freely until it reaches the assumed pitch angle. To describe this process, a simple wind turbine model with three elastic blades is formulated and some numerical simulations are performed. The results of the simulations include, among others, the time-history of the out-of-plane blade bending moment in response to the uniform gust, showing that, in this way, it is possible—at least theoretically—to reduce this moment by approximately 2/3 of its peak value. Moreover, the blade pitch angle changes faster than increased by a regular control actuator.

Słowa kluczowe:

wind turbine, gust alleviation, load reduction

Afiliacje autorów:

Grzędziński J.-IPPT PAN
Mróz A.-IPPT PAN
27p.
6.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

Streszczenie:

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.

Afiliacje autorów:

Mróz A.-IPPT PAN
Orłowska A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
20p.
7.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

Streszczenie:

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.

Słowa kluczowe:

Adaptive Impact Absorption, Adaptive Structure, Optimal Control

Afiliacje autorów:

Holnicki-Szulc J.-IPPT PAN
Graczykowski C.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Pawłowski P.K.-IPPT PAN
20p.
8.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

Streszczenie:

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.

Słowa kluczowe:

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

Afiliacje autorów:

Mróz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Karna T.-other affiliation

Lista rozdziałów w ostatnich monografiach
1.
362
Kołakowski P., Mróz A., Orłowska A., Pawłowski P., Sala D., Sekuła K., Świercz A., Wiącek D., Wójcicki P., Monitorowanie obciążeń i stanu technicznego konstrukcji mostowych, rozdział: System monitorowania stalowego mostu kolejowego, IPPT Reports on Fundamental Technological Research, pp.85-108, 2014
2.
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

Prace konferencyjne
1.Popławski B., Mikułowski G., Mróz A., Jankowski Ł., Decentralized damping of vibrations in 2D frame structures using controllable nodes, SMART 2017, 8th Conference on Smart Structures and Materials, 2017-06-05/06-08, Madrid (ES), pp.94-103, 2017

Streszczenie:

Extensive research efforts have been recently devoted to semi-active structural control with its paradigms of smart self-adaptivity and low consumption of energy, which is used for local adaptation rather than to generate external control forces. Considered application areas include adaptive landing gears, seismic isolation systems, vehicle-track/span systems, power train electro-mechanical systems, damping of flexible space structures, vehicle crashworthiness, arctic engineering, wind turbines, etc. A part of the research concerns semi-active management of strain energy for damping of structural vibrations. Early works considered truss structures with stiffness-switched bars. They later evolved into either standalone one degree of freedom stiffness-switched dampers and isolators or investigations in triggering modal energy transfer to highly-damped high-order modes. The latter researches seem all to study the fundamental vibration mode of a cantilever beam with two detachable layers and differ mainly in the actuator technologies; the main idea is to employ actuators for a quick release of the vibration-related strain energy. This research extends the problem to general 2D frames. Controllable truss-frame nodes are incorporated into the structure. Thanks to their controllable ability to transmit moments, they allow for a quick transition between truss and frame modes. We propose a new, decentralized, closed-loop control strategy based on local energy measures. Vibration damping is more effective than in the previously studied control scheme based on a global energy measure, especially for higher vibration modes. Mitigation of vibrations will be presented in representative numerical examples, including a comparison to the global energy-based control strategy. Finally, results of experimental study, conducted on a structure analogous to the one from numerical simulations, will be demonstrated.

Słowa kluczowe:

Vibration damping, Smart structures, Semi-active control, PAR strategy, Decentralized damping strategy

Afiliacje autorów:

Popławski B.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Jankowski Ł.-IPPT PAN
2.Popławski B., Mikułowski G., Mróz A., Sekuła K., Jankowski Ł., A decentralized strategy of structural reconfiguration in mitigation of vibrations, Procedia Engineering, ISSN: 1877-7058, DOI: 10.1016/j.proeng.2017.09.363, No.199, pp.1683-1688, 2017

Streszczenie:

This contribution proposes a decentralized closed-loop control algorithm for semi-active mitigation of free vibrations in frame structures. The control uses dedicated dissipative devices, which consist of two controllable structural nodes placed pairwise in both ends of selected structural beams. The nodes are capable of a controlled transition between the standard frame mode of operation (full moment-bearing ability) and the truss mode in which they do not bear any moments and constitute in fact structural hinges. Synchronous switching is equivalent to reconfiguration of the global structure by (dis)allowing the involved beams to transmit moments and to accumulate vibration energy in the form of their bending strain. Upon switching to the truss mode, the accumulated energy is released into high-frequency local vibrations, which undergo quick dissipation by standard mechanisms of material damping. The approach is illustrated in a numerical example and verified in a preliminary experimental test.

Słowa kluczowe:

Mitigation of vibrations, Semi-active control, Decentralized control, Structural reconfiguration

Afiliacje autorów:

Popławski B.-IPPT PAN
Mikułowski G.-IPPT PAN
Mróz A.-IPPT PAN
Sekuła K.-IPPT PAN
Jankowski Ł.-IPPT PAN
3.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

Streszczenie:

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.

Słowa kluczowe:

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

Afiliacje autorów:

Jankowski Ł.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Mróz A.-IPPT PAN
4.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

Streszczenie:

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.

Afiliacje autorów:

Mróz A.-IPPT PAN
Holnicki-Szulc J.-IPPT PAN
Biczyk J.-Adaptronica Sp. z o. o. (PL)
5.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

Streszczenie:

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.

Słowa kluczowe:

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

Afiliacje autorów:

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
6.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

Streszczenie:

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.

Słowa kluczowe:

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

Afiliacje autorów:

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

Abstrakty konferencyjne
1.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
2.Pawłowski P., Graczykowski C., Ostrowski M., Sekuła K., Mróz A., Controllable high performance valves for improved crashworthiness of inflatable structures, PETER 2015, Annual International Workshop on Dynamic Behaviour of Structures and Materials, Interaction and Friction Across the Strain Rates, 2015-08-26/08-28, London (GB), pp.52-53, 2015

Słowa kluczowe:

adaptive inflathigh performance valves, adaptive inflatable structures

Afiliacje autorów:

Pawłowski P.-IPPT PAN
Graczykowski C.-IPPT PAN
Ostrowski M.-IPPT PAN
Sekuła K.-other affiliation
Mróz A.-IPPT PAN
3.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

Słowa kluczowe:

Smart And Adaptive Structures, Adaptive Impact Absorption, Safety Engineering

Afiliacje autorów:

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

Patenty
Numer/data zgłoszenia patentowego
Ogłoszenie o zgłoszeniu patentowym
Twórca / twórcy
Tytuł
Kraj i Nazwa uprawnionego z patentu
Numer patentu
Ogłoszenie o udzieleniu patentu
pdf
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.
-
-
-
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.
-
-
-
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.
-
-
-
398448
2012-03-14
BUP 19/13
2013-09-16
Mróz A., Grzędziński J.
Sposób zabezpieczenia mechanizmów turbiny wiatrowej przed skutkami nagłych, nadmiernych obciążeń i układ do zabezpieczenia łopat turbiny wiatrowej.
PL, Adaptronica sp z o.o., Instytut Podstawowych Problemów Techniki PAN
221129
WUP 02/16
2016-02-29
387534
2009-03-18
BUP 20/10
2010-09-27
Graczykowski C., Mikułowski G., Mróz A., Sekuła K.
Sposób dyssypacji energii uderzenia obiektu i absorber pneumatyczny
PL, Adaptronica Sp z o.o.
214845
WUP 09/13
2013-09-30