Finite element modeling of active noise control with optimal placement of multiple actuators

Jae-Wan Kim; Vasundara V. Varadan; Vijay K. Varadan

doi:10.1117/12.240800

31 May 1996 Finite element modeling of active noise control with optimal placement of multiple actuators

Jae-Wan Kim, Vasundara V. Varadan, Vijay K. Varadan

Proceedings Volume 2715, Smart Structures and Materials 1996: Mathematics and Control in Smart Structures; (1996) https://doi.org/10.1117/12.240800
Event: 1996 Symposium on Smart Structures and Materials, 1996, San Diego, CA, United States

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.

Citation Download Citation

Jae-Wan Kim, Vasundara V. Varadan, and Vijay K. Varadan "Finite element modeling of active noise control with optimal placement of multiple actuators", Proc. SPIE 2715, Smart Structures and Materials 1996: Mathematics and Control in Smart Structures, (31 May 1996); https://doi.org/10.1117/12.240800

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