嵌入式共固化穿孔阻尼层复合材料结构动力学性能分析

建立嵌入式共固化穿孔阻尼层复合材料结构（ECPDLCS）的有限元模型（FEM），提出用改进的应变能法分析该穿孔结构的阻尼损耗因子，模态分析实验验证了文中数值模拟模型和方法的有效性。用验证的模型和方法分别研究了阻尼层厚度、穿孔孔径和孔距对整体结构模态损耗因子和频率的影响，以及在阻尼层面积比相同的情况下，孔径和孔距的分布与复合材料整体结构动力学性能的关系。结果表明：增加阻尼层厚度、减小阻尼层穿孔孔径和孔距，均有利于增大模态损耗因子，但结构固有频率则会有不同程度地降低；在相同面积比的情况下，损耗因子随着孔距和孔径的增加而增加，而固有频率则随之降低。文中的模型和方法对ECPDLCS的动力学性能理论预估具有重要的指导意义。

Dynamic property analysis of the embedded co-cured perforated damping layer composite structure

Finite element model(FEM) of the embedded co-cured perforated damping layer composite structure (ECPDLCS)was developed, and the improved mode strain energy method to predict the mode loss factor was presented. The FEM simulation results were verified by experiment data, which indicates the method and model proposed by this paper was valid. The valid model and method was employed to investigate the effects of the damping layer thickness, punch diameter and spacing on the mode loss factor and natural frequency of the embedded co-cured perforated damping layer composite structure. The impact of punch diameter and spacing on dynamics characteristics in the same damping layer area ratio was also explored. The result shows that the increasing of damping layer thickness and reducing of diameter and/or spacing can enhance mode loss factor, however the mode frequency is decreased. Under the same damping layer area ratio, the mode loss factor is rose and the mode frequency is decreased with the increasing of diameter and spacing. The conclusion is very important for the theoretical prediction of the dynamics characteristics of the ECPDLCS.