有限元分析技术在空间太阳望远镜结构设计中的应用

有限元分析技术是现代工程领域中进行结构分析的一种数值方法，已经广泛应用于天文仪器设计。它可使设计者了解被设计对象相应的特性，发现强度或刚度等方面的薄弱点，从而改进和优化设计。以空间太阳望远镜主桁架和主镜室的设计为例，从几何建模、单元划分入手，对静力学分析、模态分析、动态响应和热分析等各方面在空间太阳望远镜设计中的应用进行了阐述；分析了有限元分析存在的误差、产生的原因以及如何减少误差；叙述了有限元分析技术应用于天文仪器尤其是空间天文仪器的发展趋势。

Application of Finite Element Method to the Structure Design of the Space Solar Telescope

Finite Element Method (FEM), the primary numerical means to process structure analysis in the modern engineering field, is adopted widely in the design of astronomical instruments at present. It can help designers to find out various characteristics of the object, to discover the weakness in stiffness and strength, and to improve and optimize the design as well. It is also used widely in many processes during the designing of the Space Solar Telescope (SST), such as in the main truss and the primary cell. From the beginning of the geometry modeling and the finite element creating, many aspects such as linear static, modal analysis, transient response and thermal analysis are demonstrated in SST. The error existing in the FEM, why it exists, and how to reduce it are discussed. Finally, the development trend of FEM in the astronomical instruments especially the space astronomical instruments is presented.