首先，概述有限元接触理论及求解非线性方程的方法。
Firstly, the contact theory and the method of solving nonlinear equations are summarized.
介绍了产生结构非线性的主要来源，并在接触理论的基础上对主反射镜组件进行了合理的有限元建模。
The main source for structural nonlinearity is summarized, and a FE model for the primary mirror subassembly of a collimator is established on the basis of contact theory.
轮轨相互作用遵从赫兹非线性弹性接触理论。
The interaction between wheel and rail conforms to the Hertzian nonlinear elastic contact theory.
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