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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。
A finite element model (FEM) of embedded co-cured perforated damping layer composite structure (ECPDLCS) was proposed, and the damping loss factor of the perforated structure was proposed by using the improved strain energy method. The modal analysis experiment verified the numerical simulation models and methods Effectiveness. The effects of damping layer thickness, perforation aperture and hole pitch on the modal dissipation factor and frequency of the monolithic structure were studied respectively by using the validated models and methods. And with the same damping layer area ratio, Relationship between overall structural dynamics performance. The results show that increasing the thickness of the damping layer and reducing the perforation and pitch of the damping layer are beneficial to increasing the modal dissipation factor, but the natural frequencies of the structure will be reduced to some extent. In the same area ratio, the loss factor As the pitch and aperture increase, the natural frequency decreases. The models and methods in this paper are of great guiding significance for the theoretical prediction of dynamic properties of ECPDLCS.