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TECHNICAL PAPERS

Optimal Implementation of Miniature Piezoelectric Panel Speakers Using the Taguchi Method and Genetic Algorithm

[+] Author and Article Information
Mingsian R. Bai

Department of Mechanical Engineering, National Chiao-Tung University, 1001 Ta-Hsueh Road, Hsin-Chu 300, Taiwan, Republic of China

J. Vib. Acoust 126(3), 359-369 (Jul 30, 2004) (11 pages) doi:10.1115/1.1759695 History: Received August 01, 2003; Revised January 01, 2004; Online July 30, 2004
Copyright © 2004 by ASME
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Figures

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FEM mesh structure for modeling the piezoelectric panel speaker (a) a 12-dof plate element, with dofs indicated at node 3 (b) complete mesh with 144 elements for the piezoelectric speaker
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Pictorial descriptions for optimization of panel speaker design (a) frequency response. f0 is the first resonance frequency greater than 40 dB. pavg is average sound pressure above the frequency f0 (b) the reproduction probabilities of four chromosomes, c1∼c4, with fitness functions, 30, 9, 68, and 52, respectively, concatenated in a real line.
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Optimization of panel speaker design using GA (a) the learning curve of the position of PZT. The result has converged within about 5 iterations. (b) The optimal position of PZT found by GA.
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The learning curve of the optimal Young’s modulus of panel. The result has converged within about 6 iterations.
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Experimental arrangement of the piezoelectric panel speaker (a) physical construction of the piezoelectric panel speaker (b) the experimental setup for the performance measurement.
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Photos of piezoelectric panel speakers (a) a baffled piezoelectric panel speaker. The panel material is transparent PC. (b) A piezoelectric panel speaker implemented on a mobile phone.
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Comparison of the on-axis pressure response of the FEM simulation and the measurement
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On-axis pressure response responses of the piezoelectric panel speaker are compared for an optimal design obtained using GA and a non-optimal position
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Frequency responses of the piezoelectric panel speaker. The effect of Young’s modulus of panel is investigated. The Young’s modulus of the PC panel is close to the optimal value obtained from the GA procedure
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Results of the subjective listening test for the music input. Five configurations of piezoelectric panel speakers are compared. The average and spread of test result are indicated on the figure
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Results of the subjective listening test for the speech input. Five configurations of piezoelectric panel speakers are compared. The average and spread of test result are indicated on the figure.
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Schematic diagram of the piezoelectric panel speaker

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