粘弹性夹层板结构声传入的理论分析

基金项目:

国家自然科学基金和声学所所长基金资助项目

详细信息

Theoretical analysis of sound transmission through viscoelastic sandwich panel backed by a cavity

摘要: 应用有阻尼的简正模态概念,推导出夹层板与腔耦合条件下的声波基本方程,并通过数值计算研究了粘弹性层的特性参数对板结构振动及其辐射噪声的影响。结果表明,利用粘弹性层的剪切效应,可以有效地抑制结构的振动和由此所建立的闭空间声压。

Abstract: The coupled structural sound equation of a sandwich panel backed by a cavity is derived by using the concept of forced damped normal modes, and the effects of the sandwich core parameter on the panel vibration and internal sound field are investigated through the numerical calculation. The results show that the panel vibration and induced sound transmission can be suppressed by the shear effect of the viscoelastic layer.