基于试验的C/SiC典型结构热模态模型修正方法

Thermal Modal Modification Method of C/SiC Typical Structure Based on Modal-Test

基于有限元法的热模态理论,建立了合理的C/SiC典型结构件有限元模型。考虑到C/SiC复合材料性能参数分散性以及结构热应力附加刚度对固有频率的影响,采用弹簧单元模拟热应力的影响。根据模态试验数据,以优化的方法依次对自由边界、固支边界典型结构仿真模型进行了频率修正,对工程实际具有一定的参考意义。

The finite element model of typical hypersonic aircraft structure with C/SiC is constructed based on the thermal modal theory of finite element method. Considering the frequency factors including the dispersion of C/SiC high temperature performance and additional stiffness caused by thermal stress,the spring element is used to simulate the effect of thermal stress. The free boundary and fixed structure finite model is modified orderly using optimized method and model tested data which may be useful for practical engineering projects.