The response of unconstrained damped vibro-acoustic system using wave based prediction technique

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (19) : 158-163.

Xia Xiaojun1, 2, Xu Zhongming1, 2, Lai shiyang3, Zhang Zhifei 1, 2, He Yansong1, 2

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Abstract

The global governing vibration equation of unconstrained damped plate is induced with analysis of the complex stiffness and Kirchhoff theory. The methodology for predicting the vibration of unconstrained damped plate and the acoustic of coupled 3D vibro-acoustic system is derived based on wave base method. With a four edges clamped rectangular plate and box liked coupled system as numerical example, the out-plane displacement of unconstrained damped plate is presented. The response of selected reference point is calculated in the 50-500Hz by WBM and FEM respectively. The result of the two method validates that WBM is capable for predicting the vibration and acoustic response of unconstrained damped system effectively, and WBM is more efficient to deal with vibroacoustic problems comparing with FEM.

Key words

unconstrained damping / wave based method / bending vibration / structural-acoustic coupling

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Xia Xiaojun1, 2, Xu Zhongming1, 2, Lai shiyang2, Zhang Zhifei 1, 2, He Yansong1, 2. The response of unconstrained damped vibro-acoustic system using wave based prediction technique[J]. Journal of Vibration and Shock, 2017, 36(19): 158-163

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