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Proceedings Paper

Finite element modeling of active noise control with optimal placement of multiple actuators
Author(s): Jae-Wan Kim; Vasundara V. Varadan; Vijay K. Varadan
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Paper Abstract

Active noise control of a plate structure with multiple disk shaped piezoelectric actuators is studied. The plate is excited by an acoustic pressure field produced by a noise source located below the plate. Finite element modeling is used for the plate structure which is modeled by a combination of 3D solid, flat shell and transition elements. In the optimization procedure, the sound energy radiated onto a hemispherical surface of given radius, defined as the objective function, is minimized. The design parameters are the locations and sizes of the piezoelectric actuators are well as the amplitudes of the voltages applied to them. Automatic mesh generation is addressed as part of the modeling procedure. Numerical results for both resonance and off resonance frequencies show remarkable noise reduction and the optimal locations of the actuators are found to be close to the edges of the plate structure. The optimized result is robust such that when the acoustic pressure pattern is changed, reduction of radiated sound is still maintained. The robustness of an optimally designed structure is also tested by changing the frequency of the noise source using only the actuator voltages as design parameters.

Paper Details

Date Published: 31 May 1996
PDF: 10 pages
Proc. SPIE 2715, Smart Structures and Materials 1996: Mathematics and Control in Smart Structures, (31 May 1996); doi: 10.1117/12.240800
Show Author Affiliations
Jae-Wan Kim, The Pennsylvania State Univ. (United States)
Vasundara V. Varadan, The Pennsylvania State Univ. (United States)
Vijay K. Varadan, The Pennsylvania State Univ. (United States)

Published in SPIE Proceedings Vol. 2715:
Smart Structures and Materials 1996: Mathematics and Control in Smart Structures
Vasundara V. Varadan; Jagdish Chandra, Editor(s)

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