C/SiC盖板式热防护结构动力学建模方法

Structure Dynamic Modeling Method of C/SiC Shingle Thermal Protection System

为分析C/SiC盖板式热防护结构的动力学特性,分别建立了盖板式热防护结构的理论模型和有限元模型。首先,利用经典的拉格朗日函数能量法推导了C/SiC盖板式热防护结构理论模型的运动方程;其次,研究了C/SiC盖板式热防护结构的有限元模型采用不同的单元类型建模对其模态基频计算结果的影响;最后,基于线性假设研究了共节点和线性接触这两种装配建模方法对模态基频计算结果的影响,为建立C/SiC盖板式热防护结构合理的有限元模型提供参考。

In order to analyze the structure dynamic characteristics of C/SiC shingle thermal protection system,its theoretical model and finite element model are established respectively.Firstly,the equations of motion for the theoretical model is derived with the classical Lagrangian energy approach.Secondly,the modal analysis results of two models are compared to discuss the differences between shell and solid elements.Finally,based on the linear hypothesis,structure dynamic models of C/SiC shingle thermal protection system are built with two assembly modeling methods to provide a reference for establishing reasonable finite element model of the C/SiC shingle thermal protection system structure.