基于接触方法与集成仿真技术的摆镜面形仿真

Surface simulation of tilt mirror based on contact and integrated simulation method

为考察所设计摆镜在外载作用下面形变化是否满足设计要求,研究了摆镜在螺钉预紧力和不同方向重力作用下的摆镜面形变化规律,使用接触非线性有限元方法对摆镜进行了仿真,采用基于Zernike多项式的数据处理算法对面形数据进行了处理,得到消除刚体位移后表征实际面形变化的参数和表示刚体位移系数的分布曲线。结果表明:螺钉预紧力和不同方向重力作用下摆镜刚体位移明显,镜面平移占据了刚体位移的主要方面,基于集成仿真技术的面形处理算法可以有效消除刚体位移;预紧力存在、不同方向重力作用下摆镜面形影响略有不同,与预紧力相比重力作用对面形影响较小。预紧力作用下摆镜面形仿真数据对于摆镜设计、装调具有一定指导意义,也说明了基于接触方法面形仿真的工程适用性。

To check whether the designed tilt mirror＇s surface satisfies the design requirement under the exterior loads, and to research the surface change rule of tilt mirror under the bolt pretightening force and gravity in different direction, the tilt mirror was analyzed using contact nonlinear finite element method. The surface displacement of tilt mirror was processed using data processing algorithm based on Zemike polynomials in order to eliminate the rigid displacement. The surface parameter after eliminating the rigid displacement and distributed curve of the rigid displacement factor were gained. The result demonstrates that the rigid displacement appeared is obvious under the exterior loads and the piston term occupies the chief aspect of the whole rigid displacement compared to the tilt term. The rigid displacement can be eliminated effectively using the surface processing algorithm based on integrated simulation method. The surface has the slight difference under the gravity in different direction. Compared to the bolt pretigtening force, the gravity has a small influence on the tilt mirror surface. The tilt mirror surface simulation under the bolt pretightening force makes sense for designing and assembling the tilt mirror and also shows engineering applicability of the surface simulation based on contact method.