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Research Papers

Acoustic Response Synthesis Using Multiple Induced-Strain Actuators

[+] Author and Article Information
C. C. Lin

Department of Mechanical Engineering,  National Chung Cheng University, Chia-Yi, 621 Taiwan, R.O.C.

C. C. Cheng

Department of Mechanical Engineering,  National Chung Cheng University, Chia-Yi, 621 Taiwan, R.O.C.imeccc@ ccu.edu.tw

J. Vib. Acoust 130(1), 011011 (Jan 11, 2008) (8 pages) doi:10.1115/1.2345670 History: Received October 18, 2004; Revised June 06, 2006; Published January 11, 2008

A methodology to synthesize a predesignated acoustic response using a structure driven by multiple induced-strain actuators, e.g., piezoelectric (PZT) patches, is presented. The proposed approach of solving the inverse problem of structural acoustics, e.g., how to produce a known acoustic response from a given PZT-driven baffled plate, is accomplished using the impedance method. A dynamic model that assembles the PZT patch impedance, the host structure impedance, and the acoustic impedance is developed and then is utilized to synthesize a predesignated acoustic response. The proposed model includes the mass and stiffness of the actuator and thus provides a more accurate prediction when a structure is bonded with multiple actuators.

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Copyright © 2008 by American Society of Mechanical Engineers
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Figures

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Figure 1

A schematic representation of a PZT patch-driven structure

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Figure 2

A schematic representation of a structure bonded by multiple actuators as the voltage is applied to the kth actuator

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Figure 3

A schematic representation of a structure driven by a pair of PZT patches

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Figure 4

Schematic representations of a plate bonded with (a) two, (b) four, and (c) eight pairs of PZT patches

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Figure 5

Comparisons of sound pressure level spectra with and without including the PZT mass and stiffness effects

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