基于有限元法的贴敷阻尼薄板声辐射性能研究

PDF(1887 KB)

振动与冲击 ›› 2014, Vol. 33 ›› Issue (15) : 195-199.

论文

基于有限元法的贴敷阻尼薄板声辐射性能研究

闫兆敏，温激鸿，赵宏刚，温熙森

作者信息 +

Sound radiation from damped thin plate based on finite element method

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

Author information +

文章历史 +

摘要

基于分层理论，建立了四边简支约束条件下薄板声辐射特性有限元分析模型，计算了其固有频率、辐射声功率及振动均方速度，并与Comsol软件计算结果进行对比，证明了该方法的有效性。其次，将分层理论用于贴敷阻尼薄板的声辐射特性研究中，分析了单/多层阻尼对结构声辐射特性的影响。最后，通过分析贴敷阻尼薄板在轻/重流体、不同流速条件下的声辐射特性，研究了流体对贴敷阻尼薄板声辐射特性的影响。结果表明，贴敷多层阻尼的薄板结构声辐射特性对阻尼材料贴敷顺序较为敏感，将弹性模量较大的阻尼材料贴敷在靠外侧能够增大约束阻尼层的剪切变形，有利于提高结构整体的损耗因子，降低结构的振动和声辐射；流体流动时，结构声振特性将发生非线性变化，当流速较低时，结构声振特性变化明显，随着流速增大，变化趋势趋于平稳。

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.

导出引用

闫兆敏;温激鸿;赵宏刚;温熙森. 基于有限元法的贴敷阻尼薄板声辐射性能研究[J]. 振动与冲击, 2014, 33(15): 195-199

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