Design of optimum acoustic power of composite laminates plate based on layer-wise FEM

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Journal of Vibration and Shock ›› 2015, Vol. 34 ›› Issue (16) : 85-89.

WU Jin-wu，PENG Wen-hui，ZHAO Fei

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Abstract

An optimization method to minimize sound power of laminated composite plate based on genetic algorithm is presented in this paper. The layerwise finite element model is imposed to determine the natural frequencies and velocity distributions of laminated composite plates. Based on the acoustic radiation mode, sound power is calculated based on the acoustic radiation mode theory. A four-layer and eight-layer laminated plate were used as examples, the fiber orientation angles are chosen as design variables and the design objective is to minimize sound power. And the optimal orientation angles with sound power minimization are discussed under different frequencies. The numerical simulations show that the first order sound power and total sound power are basically same under the same optimum orientation angle. Then according to the same laminated composite plate, the optimal amount of sound power is increased with the increase of vibrating frequency. And according to the same thickness of laminated composite plate, sound power optimization is smaller when the layer number of the plate is more.

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genetic algorithm / sound power / layerwise finite element / laminated composite plates

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WU Jin-wu，PENG Wen-hui，ZHAO Fei. Design of optimum acoustic power of composite laminates plate based on layer-wise FEM[J]. Journal of Vibration and Shock, 2015, 34(16): 85-89

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