金属基体复合材料圆锥壳的材料参数识别及动力学敏感性研究

目的 研究以金属作为基体的碳酚醛复合材料圆锥壳的动力学特性，基于模态实验建立复合材料参数优化识别方法。方法 通过建立金属基体复合材料圆锥壳结构的动力学模型，表征各层材料参数对结构动力学特性的影响。开展典型铝合金-环氧胶-碳酚醛圆锥壳自由模态实验，在模态实验结果基础上，采用数值仿真开展复合材料参数识别，并采用响应面优化法研究获得材料参数的全局最优解。最后，开展结构模态对复合材料参数的敏感性分析。结果 基于拉丁超立方抽样和多项式代理模型，建立了多层复合圆锥壳的高效代理模型。对于[0, 90]S铺层的复合材料圆锥壳结构，前5组模态频率参数对E11最敏感，对v23最不敏感，剪切模量的影响介于拉伸模量及泊松比之间。结论 建立了针对各向同性-正交各向异性材料组合的多层复合圆锥壳结构的动力学模型及参数识别方法，可为结构动力学设计提供参考。

Material Parameter Identification and Dynamic Sensitivity of Metal Substrate Composite Conical Shell

The work aims to study the dynamic characteristics of carbon phenolic composite conical shell with metal as the substrate, and establish the optimized parameter identification method of composite based on modal experiment. A dynamic model of metal substrate composite conical shell structure was established to characterize the effect of material parameters of each layer on the dynamic characteristics of the structure. The free modal experiment of typical aluminum alloy-adhesive layer-carbon phenolic conical shell was carried out. Based on the modal experimental results and numerical simulation, the parameter identification of composite materials was carried out. The global optimal solution of material parameters was obtained by response surface optimization method, and the sensitivity analysis of structural mode to composite material parameters was carried out. Based on Latin hypercube sampling and polynomial proxy model, an efficient proxy model for multi-layer composite conical shells was established. For [0, 90]S laminated composite conical shell structure, the first five groups of modal frequency parameters were most sensitive to E11 and least sensitive to v23. The effect of shear modulus was between tensile modulus and Poisson''s ratio. The dynamic model and parameter identification method for anisotropic isotropic-orthotropic multi-layer composite conical shell are established, which can provide reference for the design of such structures.