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为了减轻空间光学遥感器反射镜的镜体质量,并降低反射镜在恶劣空间环境下的面形误差,利用有限元技术对某长圆形反射镜组件进行了优化设计。首先在反射镜进行轻量化后,对其进行支撑点位置优化和结构拓扑优化;其次对柔性支撑进行优化设计,引入了一种新型柔性铰链,解决了因背板热变形导致反射镜径向变形的问题,改善了反射镜面形精度。优化后的反射镜面形RMS最大值为14.6 nm,小于λ/30(λ=632.8 nm),一阶固有频率大于100 Hz,满足了设计要求,证明了该优化设计方法合理可行。
In order to reduce the mirror body quality of the space optical remote sensing mirror and reduce the shape error of the mirror in the harsh space environment, an oblong mirror assembly is optimized by the finite element method. First of all, after the mirror is lightened, the support point position optimization and structural topology optimization are carried out. Secondly, the flexible support is optimized and a new type of flexible hinge is introduced to solve the problem that the radial deformation of the reflector The problem of improving the mirror surface accuracy. The maximum RMS value of optimized mirror surface is 14.6 nm, less than λ / 30 (λ = 632.8 nm) and the first-order natural frequency is greater than 100 Hz, which meets the design requirements and proves that the optimized design method is reasonable and feasible.