基于分支梁模型的飞行器动力学建模与分析

Modeling and analysis of spacecraft with branches

研究了分支结构动力学建模对全弹模态的影响,分别建立了单梁和分支梁有限元模型,通过数值计算与试验结果对比分析发现,考虑分支结构对全弹刚度的影响时,能有效的提高模态预示精度。以分支梁模型为标准,建立了共用结点、MPC多点约束和Spring三种分支梁连接模型,基于Spring连接模型,分析了不同连接刚度对飞行器结构模态的影响。

The influence of the models on the spacecraft’s modes with branches was investigated, the dynamic analyses of beam model and beam model with branches were performed, compared with the test result, it was found that the more precise can be got by beam model with branches. Three different finite element models of spacecraft with branches were established, including： the common nodes、MPC and Spring, based on the spring model, the influence of different spring stiffness for the modes of the spacecraft was analyzed.