CAJ | 학술논문

根据某空间光学系统的SiC反射镜的设计指标要求,对比分析了各种轻量化结构(包括三角形、正方形、六边形和各种扇形轻量化结构)的力学(自重变形)、热学性能(温度应力变形).综合比较这些轻量化结构的轻量化率,比刚度和热稳定性能,最终确定采用一种扇形轻量化结构.在轻量化率达到75%的情况下,镜体的自重变形和热变形均满足要求:采用Zemike多项式拟合去除刚体位移后得出,在周边支撑情况下镜面由于自重引起的表面畸变量的RMS值为0.010 μm,约为2/60(2=0.632 8μm).
근거모공간광학계통적SiC반사경적설계지표요구,대비분석료각충경양화결구(포괄삼각형、정방형、륙변형화각충선형경양화결구)적역학(자중변형)、열학성능(온도응력변형).종합비교저사경양화결구적경양화솔,비강도화열은정성능,최종학정채용일충선형경양화결구.재경양화솔체도75%적정황하,경체적자중변형화열변형균만족요구:채용Zemike다항식의합거제강체위이후득출,재주변지탱정황하경면유우자중인기적표면기변량적RMS치위0.010 μm,약위2/60(2=0.632 8μm).
According to the design targets of a mirror which is made with the material SiC in a certain space optical system, analyze and contrast the calorific capability (which is figured by the deformation caused by the different temperature) and the mechanical capability (which is figured by the deformation caused by the gravity) of many different light-weighted structures (such as triangle, square, hexagon and various sectors). Then, decide to use one of the sector light-weighted structures after contrasting and balancing the light-weighted percent, rigidity ratio (which is the ratio of the elastic model-E and the density of the material) and the calorific stability. With the sector light-weighted structure, the light-weighted ratio reaches 75 percent, and the deformation brought by the gravity and the calorific deformation are both enough small for use. The RMS of aberration-deformation of the mirror surface with surrounding support is 0.0101 μm which is about λ /60 (λ=0.632 8 μm). The aberration-deformation does not contain the rigid displacement of the mirror surface which is removed by using the Zernike polynomial to fit the deformation of the mirror surface calculated by the MSC software.