dr inż. Dominik Pisarski

Zakład Technologii Inteligentnych (ZTI)
Pracownia Sterowania i Dynamiki Układów (PSiDU)
stanowisko: adiunkt
telefon: (+48) 22 826 12 81 wew.: 267
pokój: 437
e-mail: dpisar

Doktorat
2012-04-26Semi-Active Control System for Trajectory Optimization of a Moving Load on an Elastic Continuum 
promotor -- prof. dr hab. inż. Czesław Bajer, IPPT PAN
656
 
2014-09-16Collaborative Ramp Metering Control: Application to Grenoble South Ring  (Université Grenoble)
promotor -- prof. dr inż. Carlos Canudas-de-Wit, Université Grenoble
1079
 
Ostatnie publikacje
1.Bajer C.I., Pisarski D., Szmidt T., Dyniewicz B., Intelligent damping layer under a plate subjected to a pair of masses moving in opposite directions, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2017.01.046, pp.1-15, 2017
Bajer C.I., Pisarski D., Szmidt T., Dyniewicz B., Intelligent damping layer under a plate subjected to a pair of masses moving in opposite directions, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2017.01.046, pp.1-15, 2017

Abstract:
Reducing displacements of a plate vibrating under a pair of masses traveling in opposite directions can be improved by adding a smart subsoil instead of a classical damping layer. We propose a material that acts according to the instantaneous state of the plate, i.e., its displacements and velocity. Such an intelligent damping layer reduces vertical displacements even by 40%–60%, depending on the type of load and the assumed objective function. Existing materials enable the application of the proposed layer in a semi-active mode. The passive mode can be applied with materials exhibiting direction-dependent viscosity.

Keywords:
Plate vibration, Moving load, Intelligent damping layer, Semi-active damping

35p.
2.Dyniewicz B., Pisarski D., Bajer C.I., Vibrations of a Mindlin plate subjected to a pair of inertial loads moving in opposite directions, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2016.09.027, Vol.386, pp.265-282, 2017
Dyniewicz B., Pisarski D., Bajer C.I., Vibrations of a Mindlin plate subjected to a pair of inertial loads moving in opposite directions, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2016.09.027, Vol.386, pp.265-282, 2017

Abstract:
A Mindlin plate subjected to a pair of inertial loads traveling at a constant high speed in opposite directions along arbitrary trajectory, straight or curved, is presented. The masses represent vehicles passing a bridge or track plates. A numerical solution is obtained using the space–time finite element method, since it allows a clear and simple derivation of the characteristic matrices of the time-stepping procedure. The transition from one spatial finite element to another must be energetically consistent. In the case of the moving inertial load the classical time-integration schemes are methodologically difficult, since we consider the Dirac delta term with a moving argument. The proposed numerical approach provides the correct definition of force equilibrium in the time interval. The given approach closes the problem of the numerical analysis of vibration of a structure subjected to inertial loads moving arbitrarily with acceleration. The results obtained for a massless and an inertial load traveling over a Mindlin plate at various speeds are compared with benchmark results obtained for a Kirchhoff plate. The pair of inertial forces traveling in opposite directions causes displacements and stresses more than twice as large as their corresponding quantities observed for the passage of a single mass.

Keywords:
Mindlin plate, Mass moving at varying speed, Arbitrary trajectory, Inertial load, Space–time finite element method

35p.
3.Pisarski D., Bajer C.I., Dyniewicz B., Bajkowski J.M., Vibration control in smart coupled beams subjected to pulse excitations, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2016.05.050, Vol.380, pp.37-50, 2016
Pisarski D., Bajer C.I., Dyniewicz B., Bajkowski J.M., Vibration control in smart coupled beams subjected to pulse excitations, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2016.05.050, Vol.380, pp.37-50, 2016

Abstract:
In this paper, a control method to stabilize the vibration of adjacent structures is presented. The control is realized by changes of the stiffness parameters of the structure׳s couplers. A pulse excitation applied to the coupled adjacent beams is imposed as the kinematic excitation. For such a representation, the designed control law provides the best rate of energy dissipation. By means of a stability analysis, the performance in different structural settings is studied. The efficiency of the proposed strategy is examined via numerical simulations. In terms of the assumed energy metric, the controlled structure outperforms its passively damped equivalent by over 50 percent. The functionality of the proposed control strategy should attract the attention of practising engineers who seek solutions to upgrade existing damping systems.

Keywords:
vibration, damping, smart materials, control, semi-active

35p.
4.Bajkowski J., Bajer C.I., Dyniewicz B., Pisarski D., Vibration control of adjacent beams with pneumatic granular coupler: an experimental study, Mechanics Research Communications, ISSN: 0093-6413, DOI: 10.1016/j.mechrescom.2016.10.005, Vol.78, pp.51-56, 2016
Bajkowski J., Bajer C.I., Dyniewicz B., Pisarski D., Vibration control of adjacent beams with pneumatic granular coupler: an experimental study, Mechanics Research Communications, ISSN: 0093-6413, DOI: 10.1016/j.mechrescom.2016.10.005, Vol.78, pp.51-56, 2016

Abstract:
A novel type of pneumatic device filled with granular material is proposed in the implementation of a switched control strategy to stabilize the vibration of slender structures. The analytically obtained control law for the airtight, elastic, granular coupler is implemented in a test structure with a relay-type control logic. In the experiment, the deformable granular coupler semi-actively damps an initially deflected pair of adjacent, aluminum beams. Two cases of initial excitation are considered, showing an improvement of up to 33 percent in vibration abatement efficiency compared to the passive case. Although this semi-active device is conceptually simple, its ease of operation and low cost should attract the attention of engineers who seek solutions that can be used to build new structures and upgrade existing ones.

30p.
5.Pisarski D., Szmidt T., Bajer C.I., Dyniewicz B., Bajkowski J., Vibration Control of Double-Beam System with Multiple Smart Damping Members, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.1155/2016/2438902, Vol.2016, pp.2438902-1-14, 2016
Pisarski D., Szmidt T., Bajer C.I., Dyniewicz B., Bajkowski J., Vibration Control of Double-Beam System with Multiple Smart Damping Members, SHOCK AND VIBRATION, ISSN: 1070-9622, DOI: 10.1155/2016/2438902, Vol.2016, pp.2438902-1-14, 2016

Abstract:
A control method to stabilize vibration of a double cantilever system with a set of smart damping blocks is designed and numerically evaluated. The externally controlled magnetorheological sheared elastomer damping block is considered, but other smart materials can be used as well. The robust bang-bang control law for stabilization the bilinear system is elaborated. The key feature of the closed loop controller is the efficiency for different types of initial excitement. By employing the finite element model, the performance of the controller is validated for strong wind blow load and concentrated impact excitement of the particular point of one of the beams. For each of the excitations, the closed loop control outperforms the optimal passive damping case by over 27% for the considered energy metric.

20p.
6.Wasilewski M., Pisarski D., Bajer C.I., Adaptive stabilization of partially damaged vibrating structures, Machine Dynamics Research, ISSN: 2080-9948, Vol.40, No.1, pp.65-82, 2016
Wasilewski M., Pisarski D., Bajer C.I., Adaptive stabilization of partially damaged vibrating structures, Machine Dynamics Research, ISSN: 2080-9948, Vol.40, No.1, pp.65-82, 2016

Abstract:
In this paper, an online adaptive continuous-time control algorithm will be studied in the vibration control problem. The examined algorithm is a Reinforcement Learning based scheme able to adapt to the changing system’s dynamics and providing control converging to the optimal control. Firstly, a brief description of the algorithm is provided. Then, the algorithm is studied by the numeric simulation. The controlled model is a simple conjugate oscillator with a sudden change of its rigidity. The effectiveness of the adaptation of the algorithm is compared to the simulation results of controlling the same object by the traditional Linear Quadratic Regulator. Because of the lack of constraints for a system size or its linearity, this algorithm is suitable for optimal stabilization of more complex vibrating structures.

Keywords:
Vibration control, Adaptive control, Optimal control, Policy iterations, Hamilton-Jacobi-Bellman equation

14p.
7.Pisarski D., Canudas-de-Wit C., Nash Game Based Distributed Control Design for Balancing of Traffic Density over Freeway Networks, IEEE Transactions on Control of Network Systems, ISSN: 2325-5870, DOI: 10.1109/TCNS.2015.2428332, Vol.3, No.2, pp.149-161, 2016
Pisarski D., Canudas-de-Wit C., Nash Game Based Distributed Control Design for Balancing of Traffic Density over Freeway Networks, IEEE Transactions on Control of Network Systems, ISSN: 2325-5870, DOI: 10.1109/TCNS.2015.2428332, Vol.3, No.2, pp.149-161, 2016

Abstract:
In this paper, we study the problem of optimal balancing of vehicle density in freeway traffic. The optimization is performed in a distributed manner by utilizing the controllability properties of the freeway network represented by the Cell Transmission Model. By using these properties, we identify the subsystems to be controlled by local ramp meters. The optimization problem is then formulated as a noncooperative Nash game that is solved by decomposing it into a set of two-players hierarchical and competitive games. The process of optimization employs the communication channels matching the switching structure of system interconnectivity. By defining the internal model for the boundary flows, local optimal control problems are efficiently solved by utilizing the method of linear quadratic regulator. The developed control strategy is tested via numerical simulations in two scenarios for uniformly congested and transient traffic.

8.Pisarski D., Optimal control of structures subjected to traveling load, JOURNAL OF VIBRATION AND CONTROL, ISSN: 1077-5463, DOI: 10.1177/1077546316657244, pp.1-17, 2016
Pisarski D., Optimal control of structures subjected to traveling load, JOURNAL OF VIBRATION AND CONTROL, ISSN: 1077-5463, DOI: 10.1177/1077546316657244, pp.1-17, 2016

Abstract:
The problem of the optimal semi-active control of a structure subjected to a moving load is studied. The control is realized by a change of damping of the structure’s supports. The objective is to provide a smooth passage for vehicles and extend the time needed for the safety service of the carrying structures. In contrast to the previous works of the author, in this paper, the model used takes into account time-varying passage speeds, which allows a broader application, in particular, to robotics. The study of the optimal control problem produces a practical condition that justifies whether, for a given set of parameters, the controlled system can outperform its passively damped equivalent. For the optimization, an efficient method of parametrized switching times is developed and tested via a numerical example. The designed optimal control is examined on a real test stand. The experiments are carried out for three different passage scenarios. In terms of the assumed metrics the proposed method outperforms the passive case by over 40%.

Keywords:
optimal control, structural control, semi-active control, vibration control, moving load

9.Pisarski D., Distributed Control Design for Structures Subjected to Traveling Loads, MATHEMATICAL PROBLEMS IN ENGINEERING, ISSN: 1024-123X, DOI: 10.1155/2015/206870, Vol.2015, pp.206870-1-12, 2015
Pisarski D., Distributed Control Design for Structures Subjected to Traveling Loads, MATHEMATICAL PROBLEMS IN ENGINEERING, ISSN: 1024-123X, DOI: 10.1155/2015/206870, Vol.2015, pp.206870-1-12, 2015

Abstract:
This paper presents a novel distributed control method that adapts the structures subjected to traveling loads. The adaptation is realized by changes of the damping of the structure’s supports. The control objective is to provide smooth passage of vehicles and to extend the safe life-time of the carrying structures. The results presented in the previous works of the author exhibited high performance of supports with an open-loop switching damping policy. In this paper, the goal is to develop a state feedback strategy that is significantly less sensitive to the system parameters and much simpler for practical implementation. Further efforts are put into designing a distributed controller architecture, where only the local and the relevant neighboring states are used to compute the control decisions. The proposed controller is validated experimentally. It exhibits high performance in a wide range of travel speeds. The practicality of the proposed solution should attract the attention of practicing engineers.

20p.
10.Dyniewicz B., Pisarski D., Konowrocki R., Semi-active control of track subjected to an inertial moving load, VIBRATIONS IN PHYSICAL SYSTEMS, ISSN: 0860-6897, Vol.25, pp.147-152, 2012
Dyniewicz B., Pisarski D., Konowrocki R., Semi-active control of track subjected to an inertial moving load, VIBRATIONS IN PHYSICAL SYSTEMS, ISSN: 0860-6897, Vol.25, pp.147-152, 2012

Abstract:
The paper deals with the problem of stabilization of vibrations of the load carrying structure via adaptive damping performed with a smart material. The properties of such a material must ensure reduction of vibrations, especially accelerations and displacements of selected stationary or follower points in a higher range than in the case of the material with homogeneous bilateral characteristics. Analytical calculations and numerical simulations proved the efficiency of the approach. Results obtained with the testing system equipped with magnetorheological controlled dampers will allow us to prove experimentally assumed control strategies and rheological properties of the filling material.

Keywords:
control, moving inertial load, vibrations, smart materials

11.Pisarski D., Bajer C.I., Smart suspension system for linear guideways, JOURNAL OF INTELLIGENT AND ROBOTIC SYSTEMS, ISSN: 0921-0296, DOI: 10.1007/s10846-010-9450-7, Vol.62, pp.451-466, 2011
Pisarski D., Bajer C.I., Smart suspension system for linear guideways, JOURNAL OF INTELLIGENT AND ROBOTIC SYSTEMS, ISSN: 0921-0296, DOI: 10.1007/s10846-010-9450-7, Vol.62, pp.451-466, 2011

Abstract:
This paper presents a new method for the semi-active control of the span system of linear guideways subjected to a travelling load. Two elastic beams are coupled by a set of controlled dampers. The relative velocity of the spans provides an opportunity for efficient control via semi-active suspension. The magnitude of the moving force is assumed to be constant by neglecting inertial forces. The response of the system is solved in modal space. The full analytical solution is based on the power series method and can be given over an arbitrary time interval. The control strategy is formulated by using bilinear optimal control theory. As a result, bang-bang controls are taken into account. The final solution is obtained as a numerical mean value. Several examples demonstrate the efficiency of the proposed method. The controlled system outperforms passive solutions over a wide range. Due to the simplicity of its design, the presented solution should be interesting to engineers.

Keywords:
Semi-active control, Smart suspension system, Vibration control, Linear guideway, Moving load

20p.
12.Pisarski D., Bajer C.I., Semi-active control of 1D continuum vibrations under a travelling load, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2009.09.006, Vol.329, pp.140-149, 2010
Pisarski D., Bajer C.I., Semi-active control of 1D continuum vibrations under a travelling load, JOURNAL OF SOUND AND VIBRATION, ISSN: 0022-460X, DOI: 10.1016/j.jsv.2009.09.006, Vol.329, pp.140-149, 2010

Abstract:
The paper presents a method for computing the response of a 1D elastic continuum supported by a set of semi-active viscous dampers and induced by a load travelling over it. The magnitude of the moving force has been assumed to be constant by neglect of the inertia forces. Full analytical solution is based on the power series method and is given in an arbitrary time interval. The time-marching scheme allows us to continue a solution in successive layers with initial conditions taken from the end of previous stages. The semi-active open loop control strategy is proposed. Shapes of damping functions are defined as a form of piecewise constant function. The control strategy is suboptimal and it outperforms the passive case. Numerical results are presented for the cases of a string and a Bernoulli–Euler beam.

32p.
13.Pisarski D., Bajer C.I., On the semi-active control of carrying structures under moving a load, VIBRATIONS IN PHYSICAL SYSTEMS, ISSN: 0860-6897, Vol.24, pp.325-330, 2010
Pisarski D., Bajer C.I., On the semi-active control of carrying structures under moving a load, VIBRATIONS IN PHYSICAL SYSTEMS, ISSN: 0860-6897, Vol.24, pp.325-330, 2010

Abstract:
In this paper we address a group of recent research focused on the semi active control problems in carrying structures systems subjected to a travelling load. The magnitude of the moving force is assumed to be constant by neglecting inertial forces. The response of the system is solved in modal space. The optimal control problem is stated and it is solved by using of Pontryagin Maximum Principle. Switching control method is verified by numerical examples. The controlled system widely outperforms passive solutions. Due to its simplicity in practical design, the presented solution should be interesting to engineers.

Keywords:
Semi-active control, structural control, optimization, moving load

6p.
14.Pisarski D., Bajer C.I., Aktywne tłumienie drgań struny i belki pod obciążeniem ruchomym, DROGI I MOSTY, ISSN: 1643-1618, Vol.8, No.4, pp.71-87, 20096p.

Lista ostatnich monografii
1.
372
Bajer C.I., Dyniewicz B., Pisarski D., Bajkowski J.M., Vibration control with smart materials, IPPT PAN, pp.1-240, 2015
Lista rozdziałów w ostatnich monografiach
1.
300
Bajer C., Myśliński A., Żochowski A., Dyniewicz B., Pisarski D., Interactive computer environment for solving optimal problems-IDOS, rozdział: Solving optimal control problems described by PDEs, Ed. R. Pytlak, pp.347-394, 2012
2.
486
Pisarski D., Bajer C.I., Theoretical Foundations of Civil Engineering: XVII Polish-Ukraïnian-Lithuanian Transactions, rozdział: Active Suspension Control of 1D Continuum under a Travelling Load, Oficyna Wydawnicza Politechniki Warszawskiej, red. nauk.: Wacław Szcześniak, Artur Zbiciak, pp.273-278, 2009

Prace konferencyjne
1.Pisarski D., Collaborative Control for Structures Subjected to Traveling Loads, MSC 2015, IEEE Multi-Conference on Systems and Control, 2015-09-21/09-23, Sydney (AU), DOI: 10.1109/CCA.2015.7320688, pp.557-562, 2015
Pisarski D., Collaborative Control for Structures Subjected to Traveling Loads, MSC 2015, IEEE Multi-Conference on Systems and Control, 2015-09-21/09-23, Sydney (AU), DOI: 10.1109/CCA.2015.7320688, pp.557-562, 2015

Abstract:
The paper presents a novel collaborative control method that adapts the structures subjected to traveling loads. The adaptation is realized by changes of the damping of the structure's supports. The control objective is to provide smooth passage of vehicles and to extend the safe life-time of the carrying structures. The control method utilizes a distributed architecture where the local controllers communicate along the circular graph. The proposed controller is validated experimentally. It is simple for practical realization and exhibits the performance comparable to that provided by the optimal centralized strategies presented in [1] and [2].

2.Pisarski D., Canudas-de-Wit C., Optimal balancing of freeway traffic density: Application to the Grenoble South Ring, ECC 2013, 12th biannual European Control Conference, 2013-07-17/07-19, Zurich (CH), pp.4021-4026, 2013
Pisarski D., Canudas-de-Wit C., Optimal balancing of freeway traffic density: Application to the Grenoble South Ring, ECC 2013, 12th biannual European Control Conference, 2013-07-17/07-19, Zurich (CH), pp.4021-4026, 2013

Abstract:
This paper presents the application of the idea of optimal balancing of traffic density distribution. The idea was previously studied in the papers [1], [2], and here it is implemented to the Grenoble South Ring in the context of the Grenoble Traffic Lab. The traffic on the ring is represented by the Cell Transmission Model that was tuned by using real data and Aimsun micro-simulator. A special attention is paid to the calibration of a flow merging model. A large-scale optimization problem is solved by using decomposition methods and it is implemented by introducing combinatorial procedures. The main difficulties in the implementation as well as the limitations of the designed software are highlighted. Finally, the results of different traffic scenarios on the Grenoble South Ring are presented.

3.Pisarski D., Canudas-de-Wit C., Analysis and Design of Equilibrium Points for the Cell-Transmission Traffic Model, ACC, American Control Conference, 2012-06-27/06-29, Montréal (CA), DOI: 10.1109/ACC.2012.6315050, pp.5763-5768, 2012
Pisarski D., Canudas-de-Wit C., Analysis and Design of Equilibrium Points for the Cell-Transmission Traffic Model, ACC, American Control Conference, 2012-06-27/06-29, Montréal (CA), DOI: 10.1109/ACC.2012.6315050, pp.5763-5768, 2012

Abstract:
The problem of equilibrium points for the Cell Transmission Model is studied. The structure of equilibrium sets is analyzed in terms of model parameters and boundary conditions. The goal is to determine constant input flows, so that the resultant steady state of vehicle density is uniformly distributed along a freeway. The necessary and sufficient conditions for the existence of one-to-one relation between input flow and density are derived. The equilibrium sets are described by formulas that allow to design a desired balanced density. A numerical example for the case of a two-cell system is presented.

Keywords:
Traffic control, Vectors, Vehicles, Equations, Boundary conditions, Steady-state

4.Pisarski D., Canudas-de-Wit C., Optimal Balancing of Road Traffic Density Distributions for the Cell Transmission Model, CDC, 51st IEEE Annual Conference on Decision and Control, 2012-12-10/12-13, Maui (US), DOI: 10.1109/CDC.2012.6426749, pp.6969-6974, 2012
Pisarski D., Canudas-de-Wit C., Optimal Balancing of Road Traffic Density Distributions for the Cell Transmission Model, CDC, 51st IEEE Annual Conference on Decision and Control, 2012-12-10/12-13, Maui (US), DOI: 10.1109/CDC.2012.6426749, pp.6969-6974, 2012

Abstract:
In this paper, we study the problem of optimal balancing of traffic density distributions. The optimization is carried out over the sets of equilibrium points for the Cell Transmission Traffic Model. The goal is to find the optimal balanced density distribution that maximizes the Total Travel Distance. The optimization is executed in two steps. At the first step, we consider a nonlinear problem to find a uniform density distribution that maximizes the Total Travel Distance. The second step is to solve the constrained quadratic problem to find the near balanced optimal equilibrium point. At both steps, we use decomposition methods. The quadratic optimization problem is solved by using the Dual Problem. The computational algorithms associated to such a problem are given.

Keywords:
Traffic control, Optimization, Vectors, Vehicles, Equations, Boundary conditions

5.Dyniewicz B., Pisarski D., Konowrocki R., Semi-active control of track subjected to an inertial moving load, XXV Symposium Vibrations in Physical Systems, 2012-05-15/05-19, Poznań-Będlewo (PL), pp.1-6, 2012
Dyniewicz B., Pisarski D., Konowrocki R., Semi-active control of track subjected to an inertial moving load, XXV Symposium Vibrations in Physical Systems, 2012-05-15/05-19, Poznań-Będlewo (PL), pp.1-6, 2012

Abstract:
The paper deals with the problem of stabilization of vibrations of the load carrying structure via adaptive damping performed with a smart material. The properties of such a material must ensure reduction of vibrations, especially accelerations and displacements of selected stationary or follower points in a higher range than in the case of the material with homogeneous bilateral characteristics. Analytical calculations and numerical simulations proved the efficiency of the approach. Results obtained with the testing system equipped with magnetorheological controlled dampers will allow us to prove experimentally assumed control strategies and rheological properties of the filling material.

Keywords:
control, moving inertial load, vibrations, smart materials

6.Pisarski D., Bajer C.I., Active Suspension Control of 1D Continuum under a Travelling Load, Theoretical foundations of civil engineering : 17 Polish-Ukraïnian-Lithuanian transactions, 2009-09/09, Warszawa (PL), Vol.17, pp.273-278, 2009

Abstrakty konferencyjne
1.Pisarski D., Bajer C.I., Dyniewicz B., Szmidt T., Distributed control of smart cantilever structure, ETAMM, Emerging Trends in Applied Mathematics and Mechanics, 2016-05-30/06-03, Perpignan (FR), pp.1, 2016
Pisarski D., Bajer C.I., Dyniewicz B., Szmidt T., Distributed control of smart cantilever structure, ETAMM, Emerging Trends in Applied Mathematics and Mechanics, 2016-05-30/06-03, Perpignan (FR), pp.1, 2016

Abstract:
The work presents a novel distributed vibration control method of twin cantilever beams system coupled by a set of magnetorheological elastomers. The control is realized by a change of magnetic field influencing elastomers’ mechanical properties. The objective is to stabilize the system with the optimal rates of decrease of the energy. The control is based on an easy for practical implementation distributed state-feedback structure. It employs a set of communication channels to exchange the state information between the neighboring controllers. The performance of the designed method is validated by means of the numerical experiments. In terms of the assumed metrics, the proposed distributed method significantly outperforms the passive case and is competitive to standard centralized control.

2.Pisarski D., Decentralized stabilization of vibrating structures, XXIV Francusko-Polskie Seminarium Mechaniki, 2016-10-17/10-18, Warszawa (PL), pp.1, 2016
Pisarski D., Decentralized stabilization of vibrating structures, XXIV Francusko-Polskie Seminarium Mechaniki, 2016-10-17/10-18, Warszawa (PL), pp.1, 2016

Abstract:
The work presents novel concepts of decentralized structural vibration control. The control is assumed to be realized by a semi-active device. The objective is to stabilize a vibrating system with the optimal rates of decrease of the energy. Two types of controllers, heuristic and optimal, are considered. Both controllers employ easy for implementation decentralized state-feedback structures. They utilize a set of communication channels to exchange the state information between the neighboring controllers. The performance of the designed controllers is validated by means of the numerical experiments performed for double cantilever system equipped with a set of elastomers with controlled viscoelastic properties. In terms of the assumed objectives, the proposed distributed method significantly outperforms the passive damping cases and is competitive to standard centralized control.

3.Pisarski D., Bajer C.I., Dyniewicz B., Semi-Active Stabilization of Smart Structures Subjected to Impact Exctitation, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.805-806, 2015
Pisarski D., Bajer C.I., Dyniewicz B., Semi-Active Stabilization of Smart Structures Subjected to Impact Exctitation, PCM-CMM 2015, 3rd Polish Congress of Mechanics and 21st Computer Methods in Mechanics, 2015-09-08/09-11, Gdańsk (PL), pp.805-806, 2015

Abstract:
In the work, a novel control method to stabilize vibrations of high structures is presented. The control is realized by changes of the stiffness parameters of the structural couplers. A seismic pulse excitation applied to the structure is submitted as a kinematic excitation. For such a representation the designed control law provides the best rate of the energy dissipation. Performance in different structural settings is studied by means of the stability analysis. Then, the efficiency of the proposed strategy is examined via numerical simulations. In terms of the assumed energy metric, the controlled structure outperforms its passively damped equivalent by over 50 percent.

Keywords:
Structural control, semi-active control, smart materials, smart buildings, stabilization

4.Pisarski D., On real-time distributed adaptation of structures subjected to travelling loads, SolMech 2014, 39th Solid Mechanics Conference, 2014-09-01/09-05, Zakopane (PL), pp.107-108, 2014
5.Pisarski D., Bajer C., Moving load passage optimization via semi-active control system, CMM 2011, 19th International Conference on Computer Methods in Mechanics, 2011-05-09/05-12, Warszawa (PL), pp.188-1-2, 2011
Pisarski D., Bajer C., Moving load passage optimization via semi-active control system, CMM 2011, 19th International Conference on Computer Methods in Mechanics, 2011-05-09/05-12, Warszawa (PL), pp.188-1-2, 2011

Abstract:
In this paper the optimal control system for straight passage of moving load is considered. The magnitude of the moving force is assumed to be constant by neglecting inertial forces. The response of the system is solved in modal space. The idea of semi-active control manner for 1D continuum subjected to travelling load was first based on the numerical investigations. Then, the switching control strategy was formulated. The methods of computing the optimal switching times was developed by means of adjoint state. We present the efficient way of calculating such a switching times. The effect of pre-deflected guideway is also considered. Several examples demonstrate the efficiency of the proposed techniques. The controlled system widely outperforms passive solutions.

Keywords:
optimization, beams, sandwich structures, vibrations, industrial problems