This paper presents a theoretical and experimental study of the in-plane and out-of-plane coupling of a matched piezoelectric sensor/actuator pair bonded on a beam. Both the sensor and actuator are triangularly shaped polyvinylidene fluoride (PVDF) transducers and are intended to provide a compact sensor/actuator system for beam vibration control. The measured sensor–actuator frequency response function has shown an unpredicted increase in magnitude with frequency, which was found, to be due to in-plane vibration coupling. An analytical model has been developed to decompose the sensor–actuator response function into an in-plane contribution and an out-of-plane contribution. This in-plane coupling can limit the feedback control gains when a direct velocity feedback control is applied. A method called the jωs compensation method is proposed to identify the effect of the in-plane vibration coupling at low frequencies. Even after this compensation, however, there was unexpected strong out-of-plane coupling at even modes, which may have been caused by a lack of accuracy in the shaping of the PVDF sensor and actuator. Numerical simulations have confirmed the sensitivity of the matched sensor/actuator pair with shaping errors.
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June 2002
June 04 2002
Coupling analysis of a matched piezoelectric sensor and actuator pair for vibration control of a smart beam
Young-Sup Lee;
Young-Sup Lee
Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, England
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Paolo Gardonio;
Paolo Gardonio
Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, England
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Stephen J. Elliott
Stephen J. Elliott
Institute of Sound and Vibration Research, University of Southampton, Southampton SO17 1BJ, England
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J. Acoust. Soc. Am. 111, 2715–2726 (2002)
Article history
Received:
July 30 2001
Accepted:
March 19 2002
Citation
Young-Sup Lee, Paolo Gardonio, Stephen J. Elliott; Coupling analysis of a matched piezoelectric sensor and actuator pair for vibration control of a smart beam. J. Acoust. Soc. Am. 1 June 2002; 111 (6): 2715–2726. https://doi.org/10.1121/1.1476921
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