中厚粘弹性阻尼芯层夹层板间的耦合损耗因子研究(英文)

Coupling Loss Factor Analysis of Two L-Shaped Sandwich Plates with Thick Viscoelastic Core

耦合损耗因子是统计能量分析中表征结构子系统间耦合程度的一个重要参数。本文提供了一种由夹层板自由振动模态结果描述的夹层板耦合损耗因子计算方法,建立了芯板垂向可压缩变形(研究考虑芯层的横向正应变和正应力)的夹层板四节点有限元动力模型,用有限元方法求解得到夹层板的振动模态结果,继而代入文中计算方法求得两L型边耦合的粘弹性阻尼夹芯夹层板的耦合损耗因子。通过与商业软件AUTOSEA计算结果相比较并分析表明,文中计算方法是正确有效的,为快速准确地确定夹层板耦合损耗因子提供了一种新的思路。

Coupling loss factor （CLF） is the most crucial parameter of Statistical Energy Analysis （SEA）.Traditionally, CLF can only be calculated in high frequency band because of the need of high model density and modal overlap. In this paper, a theoretical study of CLF for two L-shaped sandwich plates which can make accurate results in low frequency band is presented using finite element method （FEM） model characteristics. The first part of this paper deals with the derivation of CLF. In the second part, a finite element of sandwich plate is created which takes into account the transverse compressible deformation of core,then the dynamical differential formulation is built up based on it. Finally, the CLF of two L-shaped edge-coupled sandwich plates are calculated with the method presented in partl by using the information obtained from part 2.The numerical results are compared with those of the commercial software AUTOSEA,and it exhibits a good agreement between them.