Analysis of vibration-acoustic coupling in cabin using a low dispersion meshless method

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (18) : 105-111.

Wang Hai-tao, Zeng Xiang-yang, Du Bo-kai, Chen Ke-an

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Abstract

Analyzing the acoustic-structural coupling in airplane cabin is an important problem in noise control and acoustic design. The wave-based methods, such as Finite Element Method and classical meshless method, are commonly used in simulations of the acoustic-structural coupling in cabins. However, these methods usually suffer the dispersion, which reduces the accuracy in mid-frequency range. For this problem, a low dispersion meshless model is developed. The model is capable of reducing the distortion of the stiffness matrix. Firstly, the model of acoustic-structural coupling under hybrid exciting source is derived. Then, a smoothing technique for sound pressure gradient is developed based on the supporting domain of meshless method. The technique can reduce the stiffness of the matrix. Lastly, the new stiffness matrix is reconstructed by combining the ones obtained using the classical meshless method and smoothing technique. The low dispersion meshless model is used to simulate the acoustic-structural couplings of a rectangular enclosure and a practical cabin structure. The results are compared with those obtained using finite element method, classical method and measurement. The comparisons demonstrated that the low dispersion meshless model has higher accuracy on simulating the system stiffness and gives closer results with real solutions in mid-frequency range.

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Wang Hai-tao, Zeng Xiang-yang, Du Bo-kai, Chen Ke-an. Analysis of vibration-acoustic coupling in cabin using a low dispersion meshless method[J]. Journal of Vibration and Shock, 2017, 36(18): 105-111

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