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针对一种碳纤维复合材料双Ω薄壳结构中折叠展开变形以及局部损伤对动态特性的影响问题,基于Rayleigh方程,引入了纤维复合材料结构中铺层相关因子,讨论卷曲展开程度及薄壁结构局部损伤对结构动态特性的影响程度;建立了双Ω薄壳结构的动态测试系统,采用了单点激励多点响应的动态测试方法,得到了双Ω薄壳结构分别在展开、卷曲收拢和局部屈曲破坏后的一阶、二阶固有频率。测试结果验证了数值仿真结果的正确性,并表明卷曲后双Ω薄壳结构基频增大,局部屈曲破坏后的双Ω薄壳结构基频减小。
Aiming at the problem of the dynamic deformation caused by the folding deformation and the local damage in a double-walled carbon fiber (CFRP) double-walled carbon fiber composite structure, the related factors of the ply in the fiber composite structure are introduced based on the Rayleigh equation. The dynamic test system with double-Ω thin shell structure was established. The dynamic test system with single-point excitation and multi-point response was used. The double-Ω thin shell structure was obtained by unfolding, curling and local buckling After the destruction of the first order, the second natural frequency. The test results verify the correctness of the numerical simulation results and show that the fundamental frequency of the double-Ω thin-shell structure increases after curling, and the fundamental frequency of the double-Ω thin-shell structure decreases after the local buckling failure.