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1

Dynamics control of an autoparametric system with the spherical pendulum using mr damper

Sado D., Freundlich J.

Vibrations in Physical Systems

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2018

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Vol. 29

art. no. 2018016

EN

Dynamic properties of the three degrees of freedom autoparametric system with spherical pendulum including the magnetorheological (MR) damper are investigated. It was assumed that the spherical pendulum is suspended to the oscillator excited harmonically in the vertical direction. The influence of damping force described by Bingham’s model on the energy transfer can be modified by magnetic field. The equation of motion have been solved numerically. In this type system one mode of vibration may excite or damp another one, and for except different kinds of periodic vibrations there may also appear chaotic vibration. Results show that MR damper can be used to change the dynamic behavior of the autoparametric system with spherical pendulum giving semiactive control possibilities.

2

Adaptacyjno-pasywne tłumienie w syntezie dyskretnych mechatronicznych układów drgających

Buchacz A., Gałęziowski D.

Modelowanie Inżynierskie

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2013

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T. 16, nr 47

48--52

PL

W pracy przedstawiono problem realizacji tłumienia adaptacyjno-pasywnego w dyskretnych mechatronicznych układach drgających. Ze względu na dobór odpowiednich parametrów, liczbę stopni swobody oraz wybraną metodę syntezy możliwe jest tworzenie zróżnicowanych układów mechatronicznych, w których element piezoelektryczny, połączony z odpowiednią konfiguracją obwodu elektrycznego, pełni funkcję tłumika adaptacyjno-pasywnego. Zbadano wybrane typy układów mechatronicznych w kontekście ujemnych parametrów: sztywności i pojemności elektrycznej, stosując znane zagadnienie syntezy mechatronicznych układów dyskretnych. Wyniki odniesiono do układów z tłumieniem pasywnym.

EN

In this paper the problem of adaptive-passive damping function in mechatronic discrete vibrating systems has been presented. In relation to selection of various parameters, the number of degrees of freedom and chosen method of synthesis it’s possible to create different mechatronic systems, in which piezo actuator connected is to external electric network configuration that perform adaptive-passive damping function. Basing on the known issue of solving the reverse task of discrete mechatronic systems selected structures have been investigated, paying attention to negative parameters: stiffness and electric capacitance. The results have been compared with the example system with passive vibration isolation method.

3

Semi-active suboptimal control strategy applied to periodically vibrating mechanical systems

Miachajłow M., Szolc T.

IPPT Reports on Fundamental Technological Research

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2013

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nr 4

31--36

EN

The aim of this paper is to present the new method for obtaining the semi-active suboptimal control strategy, used for the purpose of vibration reduction in mechanical systems. The method is dedicated to systems where vibrations are of a periodic type. Generally, many semi-active control strategies have been developed up to date, but it seems that none of them are applied directly to the problem of mechanical systems suffering from disadvantageous, periodical vibrations. Probably, the reason why there were no such attempts in the past is that the semi-active vibration damping methods most often were used in situations where systems experience a finite time transient excitation, like for example seismic activity. In a case of systems experiencing repeatable (periodic), steady-state vibrations, such as machines or vehicles working at their nominal conditions, the common approach was to use the passive methods rather than the semi-active ones. This situation is changing nowadays and attempts of using semi-active methods to attenuate the disadvantageous steady state vibrations in machines and vehicles are becoming more common and successful. Therefore, there has been observed a surge in developing of the general purpose methods for determination of the optimal control strategies for such applications. The described method aspires to be the one of possible alternatives.