Eugeniusz Świtoński

Silesian University of Technology, Gleiwitz, Silesian Voivodeship, Poland

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Publications (6)0 Total impact

  • Source
    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. 01/2008;
  • Source
    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.
    Journal of Achievements in Materials and Manufacturing Engineering. 01/2007;
  • Source
    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.
    Journal of Achievements in Materials and Manufacturing Engineering. 01/2007;
  • Eugeniusz Red. naukowa Świtoński
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    ABSTRACT: 123, [5] s. : il., wykr. ; 24 cm.
  • Eugeniusz Świtoński
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    ABSTRACT: 203 s. : il. ; 24 cm.
  • Source
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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.