Active vibration damping using a self-sensing electrodynamic actuator

Paulitsch, Christoph K., Gardonio, Paolo and Elliott, Stephen J. (2004) Active vibration damping using a self-sensing electrodynamic actuator. Wang, Kon-Well (ed.) In Smart Structures and Materials 2004: Damping and Isolation. vol. 5386, SPIE - The International Society for Optical Engineering. pp. 282-293 . (doi:10.1117/12.539737).

Abstract

Shunt damping for piezoelectric actuators has been extensively studied using passive, tuned or negative capacitance components. Recently it has been noted that a capacitor together with a negative resistance amplifier can also be used for shunt damping using electrodynamic actuators with a low cut-off frequency. However simulations presented in this study indicate that this method is not appropriate for electrodynamic actuators with a high electrical cut-off frequency. This study compares experimental and simulation results of three control approaches obtained with a simple electrodynamic shaker that has a high electrical cut-off frequency: first, proportional current feedback; second, induced voltage feedback estimated with a Wheatstone bridge and third, induced voltage feedback estimated with an Owens bridge which compensates for the inductance of the shaker. The study shows that induced voltage feedback using an Owens bridge results in a negative inductance component that is an appropriate means to obtain vibration damping of a single degree of freedom system. Imperfect tuning to the magnetic parameters and interaction with power amplifier dynamics limit the bandwidth.

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