The Effect of Artificially Reducing the Size of lnductors in Piezoelectric Shunt Damping Circuits 1

Abstract Connecting a passive electrical network to a structurally attached piezoelectric transducer is referred to as passive shunt damping. Current shunt circuit designs, e.g. a single mode L — R network, typically require large inductance values of up to thousands of Henries. In practice, discrete inductors are limited in size to around 1 H. By placing an additional capacitance across the terminals of the piezoelectric transducer, shunt circuit inductance values can be greatly reduced. To justify our claims, we present a theoretical analysis of the damped system and identify the influence of the additional capacitance. Two modes of a simply supported beam are successfully damped using a capacitance modified shunt circuit.

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