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2 July 2001 Multifrequency piezoelectric vibration absorber for variable frequency harmonic excitations
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It has been shown that piezoelectric materials can be used as passive electromechanical vibration absorbers by shunting them with electrical networks. Semi-active piezoelectric absorbers have also been proposed for suppressing harmonic excitations with varying frequency. However, these semi- active devices have limitations that restrict their applications. In a previous study, the authors have developed a high performance active-passive alternative to the semi-active absorber that uses a combination of passive electrical circuit and active control actions. The active control consists of three parts: an adaptive inductor tuning action, a negative resistance action, and a coupling enhancement action. This new device has been shown, both analytically and experimentally, to be very effective for the suppression of harmonic disturbances with time-varying frequency. In the present paper, the adaptive active-passive piezoelectric absorber configuration is modified so that it can track and suppress multiple harmonic excitations. The effectiveness of this new multi-frequency absorber design is demonstrated by comparing its performance and control power requirement to a start-of-the-art adaptive feedforward control law.
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Ronald A. Morgan and Kon-Well Wang "Multifrequency piezoelectric vibration absorber for variable frequency harmonic excitations", Proc. SPIE 4331, Smart Structures and Materials 2001: Damping and Isolation, (2 July 2001);

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