用子结构模态综合法求解光学反射镜组件结构动响应

Dynamic response analysis of optics speculum and its subassemblies by modal synthesis of substructures

在航天光学成像仪器中光学反射镜组件结构复杂,相应的有限元分析模型大,因此分析效率较低。针对此问题,引入子结构模态综合法作为光学反射镜组件结构动响应的求解方法。具体讨论了子结构模态综合法求解结构动响应的基本原理,说明了该法在工程上的实现方法。以某反射镜组件为例进行了计算,结果表明,子结构模态综合法与经典的整体FE分析法比较,求解的前10个固有频率误差小于7%,计算时间前者为后者的2/3;加速度响应曲线符合良好,计算时间前者为后者的2/5,子结构模态综合法的计算效率明显提高,工程适用性良好。

In space remote sensor optics speculum and its subassemblies have complicated structure and correspondingly large FE model. The method modal synthesis of substructures as dynamic responses solving approach was introduced. After concretely discussing the principle of modal synthesis of substructures and implementation approach in project, a concrete example was given. The results indicate, modal synthesis of substructure contrasting to the classical FE method, normal frequency errors are less than 7%, the calculate time is shorten to 2/3; acceleration response curves consistent well, the calculate time is shorten to 2/5, the analysis efficiency obviously improves; the modal synthesis of substructures is well suit for project application.