Eugeniusz Świtoński

Silesian University of Technology, Gleiwitz, Silesian Voivodeship, Poland

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Publications (7)1.82 Total impact

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    ABSTRACT: The paper addresses analytical, numerical and experimental aspects of the design of controlled fluid damper. The mathematical model served the development of a numerical model in MATLAB/Simulink environment. The selected important aspects of the tracked vehicles dynamic modelling process related to dynamics of the drive system and the suspension of selected tracked vehicles are presented. The main aim of the article was to present the investigation results of the experimental studies of a prototype rotary shock absorber at various magnitudes of control current was presented in this paper. Simulation and preliminary experimental results comprising resistance force values as a function of angular displacement and angular velocity are presented
    Innovative Control Systems for Tracked Vehicle Platforms, Studies in Systems, Decision and Control, Vol.2 edited by Aleksander. M Nawrat. M, 01/2014: chapter Tuning the Dynamic Characteristics of Tracked Vehicles Suspension Using Controllable Fluid Dampers: pages pp 243-258; Springer International Publishing., ISBN: 978-3-319-04623-5
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    Eugeniusz Świtoński, Arkadiusz Mężyk
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    ABSTRACT: The paper deals with a modelling of electromechanical drive systems incorporating vector control unit. The algorithms of sensitivity analysis and optimization of dynamic features have been elaborated and applied for selection of design features of the system with the aim to minimize dynamic forces in kinematic pairs. The assumed dynamic model takes into account electromechanical couplings and enables computer simulation of dynamic phenomena occurring in kinematic pairs of the drive system for various initial conditions. It is shown that the optimization process is more effective when both mechanical and electromagnetic parameters are used simultaneously. The application of optimization procedures in the design process is an effective aid and may be applied for determining design features of the drive systems considered here.
    Automation in Construction 03/2008; DOI:10.1016/j.autcon.2007.05.001 · 1.82 Impact Factor
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    Świtoński E, Mężyk A, Duda S, Kciuk S
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    ABSTRACT: Purpose: The paper presents a concept of a system for isolation from external vibration sources with use of a magnetorheological (MR) dampers.Design/methodology/approach: Results of experimental studies of a prototype magnetorheological damper at various magnitudes of control current and the manner of modelling electromagnetic phenomena occurring in the damper are presented in this paper. The effect of magnetic field on magnetorheological fluid is modelled by the finite element method. The mathematical model of the system as well as the damper model are outlined along with the relevant control facilities. Numerical simulations were carried out for an exemplary excitation.Findings: The elaborated damper and applied control algorithms substantially influences the values for velocities and accelerations. Incorporation of a controllable damper into the stabilization system significantly decreases displacements of the mass to be stabilized being the results of shocks and bumps caused by excitations w(t) as compared to similar displacement of the same mass when only a passive damper was used.Research limitations/implications: For the future research it is necessary to improve characteristics of elaborated damper in order to improve its efficiency.Practical implications: Many mechanical systems should separate from sources of vibrations. The active or semiactive vibration control systems offer a number of advantages as compared with passive systems so that better efficiency of vibration damping is assured.Originality/value: The paper presents new concept of vibration damper with magnetorheological fluids and way of its application in industrial practice.
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    Świtoński E, Mężyk A, Klein W
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    ABSTRACT: Purpose: The goal of this paper is to present application and method of numerical modelling smart materials in vibration control systems. Two methods of vibration control was presented in this work. First one is based on shape memory alloy absorber. Second method use magnetorheological bearing which was placed in revolute join of manipulator mechanism.Design/methodology/approach: The numerical models of presented mechanical systems were created in APDL language, which is internal ANSYS language. Dynamic characteristics of shape memory alloy absorber were determined by using algorithm which automatically changes absorber’s length. The manipulator mechanism with magnetorheological bearing was modelled by using multibody dynamics method connected with finite element method in ANSYS environment.Findings: Through this study it was determined shape memory alloy absorber’s length which eliminated specified resonance due to natural frequencies of mechanical system. The dynamic characteristics of mechanical system with magnetorheological bearing were also obtained.Research limitations/implications: The main disadvantage of presented methods is the necessity to calculate parameters for each iteration step. In the case of shape memory alloy absorber this process significantly extends the calculation time.Practical implications: Presented methods allowed to determine dynamic characteristics of vibration control systems using smart materials and enabled implementation of the method to commercial finite element method environment.Originality/value: This work contains new aspects, which are: determination of shape memory alloy absorber’s length, practical implementation of magnetorheological fluids in vibration control systems.
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    Arkadiusz Mężyk, Eugeniusz Świtoński
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    ABSTRACT: A methodology for shaping the dynamic characteristics of machines has been presented in the paper. The objective of the performed investigations was to minimize dynamic reactions in kinematic pairs of the system under analysis. In the formulated algorithm for selecting dynamic parameters of the systems, numerical methods of the sensitivity analysis and optimisation found application. Time-dependent objective functions, describing time courses of dynamic reactions of the systems in unsteady states, and frequency-dependent objective functions, describing resonance curves, are taken into account in the presented algorithm. The so formulated problems served for minimizing the peak values of time courses of the dynamic forces as well as for optimisation of resonance characteristics of the systems incorporating a dynamic vibration eliminator. The investigations were performed when making use of discrete models of dynamic electromechanical machinery systems. A method of sequential linear programming was applied to search for optimum dynamic parameters for all types of the objective function. The method was used to minimize electromechanical vibration amplitudes of drive systems in unsteady states (start-up, sudden change in load). The paper deals also with shaping of dynamic responses to the system with the aid of resonance curves in the frequency domain. In this case the optimisation was oriented at minimizing the peak values corresponding to selected natural frequencies. An optimisation of the objective function describing a coefficient of amplitude amplification was carried out on the example of a dynamic system with a vibration eliminator. The algorithm enables to optimise dynamic characteristics of machines for different objective functions and constraints. Calculations were made when taking the optimisation of dynamic characteristics of an electromechanical drive system of a working machine as an example.
    European Congress on Computational Methods in Applied Sciences and Engineering ECCOMAS 2000, Barcelona; 08/2000
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    ABSTRACT: Streszczenie. W artykule przedstawiono przykładowe wyniki pomiarów potencjałów czynnościowych mięśni dla dzieci zdrowych, z zaburzeniami neurologicznymi oraz po usunięciu guza tylnej jamy czaszki. Pomiary zostały przeprowadzone przy pomocy zestawu BTS Pocket EMG, który jest zintegrowany z systemem do trójwymiarowej analizy ruchu BTS Smart. 1. WSTĘP Od wielu lat elektromiografia zajmuje czołowe miejsce jako narzędzie diagnostyczne u pacjentów z zaburzeniami neurologicznymi. Jest także przydatna przy wyborze metody leczenia, rehabilitacji oraz ocenie postępów rehabilitacji. Elektromiografia zajmuje się badaniem zmian aktywności elektrycznej mięśni. Ocena sygnałów EMG dostarcza informacji o czasie aktywności mięśni, czyli kiedy dany mięsień albo grupa mięśniowa jest aktywna i jak długo trwa ta aktywność oraz o względnej intensywności aktywności mięśni, czyli czy mięsień jest mniej lub bardziej aktywny. Badania EMG mogą być prowadzone z użyciem elektrod powierzchniowych lub igłowych. Jednakże biorąc pod uwagę dużą inwazyjność elektrod igłowych, do badań wykorzystywane s ą g ł ównie elektrody powierzchniowe, w szczególności, gdy badaniu poddawane są dzieci. Elektromiografia powierzchniowa stała się, obok analizy parametrów czasowo-przestrzennych, wielkości kinematycznych, kinetycznych, a także reakcji podłoża, jednym z ważniejszych narzędzi oceny prawidłowego chodu [1,2,3,4,5,6]. 2. CEL PRACY Celem podjętych badań jest ocena aktywności elektrycznej mięśni w poszczególnych fazach chodu u dzieci z prawidłowym chodem, u dzieci z zaburzeniami neurologicznymi oraz u dzieci po usunięciu guza tylnej jamy czaszki.
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    Paweł Bachorz, Arkadiusz Mężyk, Eugeniusz Świtoński
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    ABSTRACT: Problems relating to modelling, sensitivity analysis and optimization of a high-power electromechanical drive system incorporating a control unit have been dealt with in the paper. A spatial model in which couplings between particular subsystems have been taken into account was employed here. The vibration level has been lowered and the energy consumption of the system has been reduced due to the optimization procedure carried out. Evolutionary algorithms have been used to perform the optimization.