双层阻尼薄膜夹嵌复合材料梁的动力学性能

Dynamic performance of composite beam embedded by a double-layer damping film

为了研究共固化双层阻尼薄膜夹嵌复合材料梁在固支边界条件下的动力学性能,本文依据一阶剪切变形理论(FSDT)、变分原理和Hamilton原理,建立了共固化双层阻尼膜夹嵌复合材料梁的自由振动理论模型,使用伽辽金加权余值法求解了固支边界条件下的自由振动理论解。搭建实验平台,得到实验数据和模态振型。通过将理论计算结果与模态实验和ANSYS有限元分析结果进行对比验证,验证了理论模型的有效性。进一步探究了复合材料层和阻尼层的分布及结构几何参数对共固化双层阻尼薄膜夹嵌复合材料梁动力学性能影响的规律,为双层阻尼薄膜复合材料梁结构的优化设计提供理论依据。

In order to study the dynamic performance of a co-cured double-layer damping film sandwiched composite beam under fixed-support boundary conditions,based on the first-order shear deformation theory(FSDT),the variational principle and the Hamilton principle,a free vibration theoretical model of a co-cured double-layer damping film embedded composite beam was established in this paper.The Galerkin weighted residual value method is used to solve the free vibration theoretical solution under fixed-support boundary conditions.An experimental platform is constructed to obtain experimental data and modal shapes.The validity of the theoretical model is verified by comparing the theoretical calculation results with the modal experiment and ANSYS finite element analysis results.The influence of the distribution and structural geometric parameters of the composite material layer and the damping layer on the dynamic performance of the co-cured double-layer damping film embedded composite beam is further explored,which provides a theoretical basis for the optimal design of the double-layer damping film composite beam structure.