大口径光学元件环境热稳定性的有限元分析
Finite element analysis on ambient thermal stability of large aperture optical element
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摘要: 讨论了靶场光学元件在环境热载荷作用下的变形分析理论和数学描述，采用有限元分析软件ANSYS建立了靶场反射镜的模型，用靶场实测环境温度变化作为载荷，计算得到了反射镜在靶场温度变化0.3 ℃时，垂直镜面方向的变形及其在平行于镜面平面内的转角漂移。结果表明：在当前的温控条件下，光学元件在环境热载荷作用下的变形满足稳定性设计要求。并计算了几种环境温度变化下反射镜的变形和转角漂移。初步的结果表明：环境温度变化与反射镜的转角漂移成正比。Abstract: This paper discusses the deformation theory of large aperture optical element under thermal loads, and builds the finite element model by the software ANSYS. High precision sensors are used to measure the temperature around the optical elements in the target building and temperature change curve are plotted. The biggest temperature margin is 0.3 ℃ in 2 h. The biggest temperature margin is loaded on the finite element model of the optical element and the deformation of the optical element is got. The results indicate that the deformation of the optical element satisfy the stability requirement under present temperature control situation. At the same time, the deformation of the optical element under various temperature margins is calculated. The results indicate that the deformation of the
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