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Impedance Losses in Negative Capacitance Circuits for Semi‐Passive Vibration Control with Piezo‐Ceramics
Author(s) -
Oleskiewicz Robert,
Neubauer Marcus,
Krzyzynski Tomasz
Publication year - 2006
Publication title -
pamm
Language(s) - English
Resource type - Journals
ISSN - 1617-7061
DOI - 10.1002/pamm.200610142
Subject(s) - gyrator , negative impedance converter , amplifier , damping factor , electrical impedance , shunt (medical) , operational amplifier , capacitance , electronic circuit , voltage , vibration , electrical engineering , engineering , electrical element , current feedback operational amplifier , inductance , electronic engineering , acoustics , input impedance , physics , voltage source , cmos , medicine , electrode , quantum mechanics , cardiology
Damping or absorbing effect in vibration control applications with piezo elements may be customized by an external impedance shunt branch connected to the plates of the piezo element. The negative capacitance present in the shunt significantly improves the damping and absorbing performance of such systems. The circuit is built up of an electronic gyrator realized by the operational amplifier, which is in reality not the ideal element. Therefore the performance of the proposed systems is limited, concerning the maximum voltages and currents at which the operational amplifiers can operate. In the paper, the finite gain of the operational amplifier, together with the loss impedances and the feedback gain factor is studied. The influence of the certain imperfections in the design of the electronic gyrator is based on 1DOF mechanical oscillator, with a piezo stack. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)