Active tuning and coupling enhancement of piezoelectric vibration absorbers for variable-frequency harmonic excitations in multiple-degrees-of-freedom mechanical systems

Ronald A. Morgan; Kon-Well Wang; Jiong Tang

doi:10.1117/12.388852

22 June 2000 Active tuning and coupling enhancement of piezoelectric vibration absorbers for variable-frequency harmonic excitations in multiple-degrees-of-freedom mechanical systems

Ronald A. Morgan, Kon-Well Wang, Jiong Tang

Author Affiliations +

Proceedings Volume 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems; (2000) https://doi.org/10.1117/12.388852
Event: SPIE's 7th Annual International Symposium on Smart Structures and Materials, 2000, Newport Beach, CA, United States

Abstract

It has been shown that piezoelectric materials can be used as electromechanical vibration absorbers when they are shunted by an electrical network. Semi-active piezoelectric absorbers have also been proposed for the purpose of suppressing harmonic excitations with varying frequencies. These semi- active devices can be constructed using a variable inductance or variable capacitance element in the shunt circuit, however both of these implementations have several limitations that restrict their practical use. The design presented here is a high performance alternative to semi-active absorbers that uses a combination of a passive RL circuit and an adaptive feedback law to suppress harmonic excitations with varying frequency. The adaptive tuning is accomplished by simulating a variable inductor using feedback. An equation for the optimal tuning of the piezoelectric absorber on a general MDOF structure is derived. Next, it is illustrated that the performance and robustness of the piezoelectric absorber can be increased by using additional active actions to reduce the circuit resistance and enhance the coupling of the piezoelectric. Two methods for increasing the effective coupling of the absorber are examined -- a negative capacitance shunt and active coupling feedback. Finally, the effectiveness of the proposed algorithm is demonstrated experimentally.

Citation Download Citation

Ronald A. Morgan, Kon-Well Wang, and Jiong Tang "Active tuning and coupling enhancement of piezoelectric vibration absorbers for variable-frequency harmonic excitations in multiple-degrees-of-freedom mechanical systems", Proc. SPIE 3985, Smart Structures and Materials 2000: Smart Structures and Integrated Systems, (22 June 2000); https://doi.org/10.1117/12.388852

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