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采用球铰支撑可以极大地提高大孔径反射镜工作的可靠性,但必须对这种支撑方式进行合理的稳定性分析。球铰支撑方式的有限元分析必须围绕其支撑方式所具有的严格而又明显的接触特性、顶丝预紧力作用、具有相对滑动趋势而产生的摩擦这三大基本特征展开。应用传统的线性有限元分析手段对大孔径反射镜球铰方式支撑的尺寸稳定性分析具有较大的局限性。为提高分析精度,采用了非线性分析方法,最大程度地模拟实际结构,并将罚函数的摩擦形式引进到了摩擦接触对中,并对其进行了实际模型的解算,使得分析结果更加精确,并依据分析结果,对预紧力进行了合理地选取,使反射镜在一定的工作环境下能够稳定地工作,满足系统成像的需要。
The use of spherical hinge support can greatly enhance the reliability of the work of large aperture mirrors, but this support mode must be reasonable stability analysis. The finite element analysis of the spherical hinge support mode must focus on the three basic features of the strict and obvious contact characteristics of the support mode, the pre-tightening force of the top wire and the friction caused by the relative sliding tendency. The application of the traditional linear finite element analysis method has great limitations on the analysis of the dimensional stability of the ball-point support with large aperture mirrors. In order to improve the accuracy of analysis, a nonlinear analysis method is adopted to simulate the actual structure to the maximum extent. The frictional form of the penalty function is introduced into the frictional contact pair, and the actual model is solved. The result of the analysis is more accurate, According to the analysis results, the pre-tightening force is reasonably selected so that the mirror can work stably under a certain working environment to meet the needs of system imaging.