Sound radiation from damped thin plate based on finite element method

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (15) : 195-199.

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Sound radiation from damped thin plate based on finite element method

Yan Zhao-min, WEN Ji-hong, ZHAO Hong-gang, WEN Xi-sen

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Abstract

The finite element method based on Layerwise theory has been employed for modeling thin simple supported plates. The natural frequency, the sound radiation and the mean square velocity calculated by this method meet well with those by Comsol software. The Layerwise theory is then expanded to analyze the influence of single/multiple layer viscoelastic material on the vibro-acoustic properties of the thin plate. The influences of light/heavy fluid and the flow velocity on the characters of the fluid are investigated as well. The results show that the sound radiation is sensitive to the stacking sequence of damping layers and it is better to stack the layer with higher young’s modulus on the out board, which can increase the structural acoustic radiation loss factor and reduce the sound radiated power. In addition, the vibro-acoustic of the thin plate occurs a nonlinear change due to the flow velocity and it changes dramatically while the flow velocity is slow and then slightly with the increase of the flow velocity.

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finite element method / layerwise theory / sound radiate / damping / laminated plate / fluid structure inter-action

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Yan Zhao-min;WEN Ji-hong;ZHAO Hong-gang;WEN Xi-sen. Sound radiation from damped thin plate based on finite element method[J]. Journal of Vibration and Shock, 2014, 33(15): 195-199