摘要
针对主动光学系统中的φ620mm弯月薄镜设计了双向柔性侧支撑结构,从理论上分析了薄镜切向侧支撑方式的工作原理和支撑力的分布情况,并采用有限元法计算出望远镜指向水平时薄镜所受侧支撑力的大小和方向,验证了受力分析的正确性。通过有限元计算出不同俯仰角下,切向侧支撑方式和轴向主动支撑共同作用时薄镜校正前后的镜面面形的变化情况。当望远镜指向水平时,薄镜镜面变形最大,经过主动校正后的镜面面形误差RMS值为14.1nm,满足设计指标要求。
A double-direction flexure lateral support system was developed for the 620mm thin meniscus mirror of an active optics telescope.（Axial tensile stiffness and two-direction flexibility of the flexure lateral support system were estimated by finite element analysis）.The action principle of the tangent lateral support mode was described,and the tangent support force was analyzed in theory.With application of finite element method,the support force values and directions were calculated when the telescope pointing to horizon,and the result verified the validity of stress analysis.With tangent lateral supports and axial active supports,the thin mirror deformations at different pitch angles were calculated.The surface figure deformation reaches maximum at the 90°itch angle,and the root-mean-square（RMS） value is 14.1nm after active correcting with axial force actuators.It satisfies the design requirement.
出处
《长春理工大学学报（自然科学版）》
2011年第1期53-56,共4页
Journal of Changchun University of Science and Technology(Natural Science Edition)
基金
中国科学院长春光学精密机械与物理研究所三期创新工程资助项目
关键词
主动光学
弯月薄镜
切向侧支撑
有限元法
主动校正
active optics
thin meniscus mirror
tangent lateral support
finite element method
active correction
