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27 April 2007 On semi-active enhancement of the dissipation provided by piezoelectric films
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Light weight flexible structures designed for space application may be well served by an ability locally to tune the dissipation and stiffness of the structural element. The method investigated here is based on a combination of a piezoelectric strip and an operational amplifier based active circuit which enables control of the effective impedance over a wide range. In this paper, we discuss an analytical model substantially reformulated from our previous work to capture the direct link between membrane tension and voltage across the circuit. It is observed that when tuned for negative impedance, the circuit enables significantly enhanced dissipation of vibrations due to external loads. Theoretical and experimental results are discussed here for the response non-laminated films to line-impact loads. The analytical results presented here account for dissipation and added mass effects of air. A laser doppler vibrometer is used to provide a comparison for the voltage measurements across the piezoelectric strip electrodes.
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Umesh A. Korde, Miles A. Wickersham, Travis J. Zelfer, Lidvin Kjerengtroen, and Christopher H. M. Jenkins "On semi-active enhancement of the dissipation provided by piezoelectric films", Proc. SPIE 6525, Active and Passive Smart Structures and Integrated Systems 2007, 65250Z (27 April 2007);

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