为降低小口径反射镜在复杂环境下的面形误差, 满足其动静态刚度和热稳定性要求, 通过选用合适的空间载荷材料, 对反射镜进行轻量化设计, 合理设计可装调的反射镜挠性支撑组件, 采用ANSYS对反射镜组件进行有限元分析。分析结果表明: 组件一阶固有频率是3 168.5 Hz, 在1 g重力作用下反射镜面形误差RMS值可达8.06 nm, 在10℃温升载荷作用下RMS可达5.58 nm, 在1 g重力和10℃温升载荷耦合作用下RMS值可达11.05 nm, 组件在10 g加速度作用下最大应力是2.109 8 MPa, 简谐激励作用下最薄弱环节最大响应应力为1.284 6 MPa, 均完全满足反射镜组件设计指标要求, 验证了支撑结构设计的合理性。

In order to reduce the surface shape error of small caliber reflector in the complex environment and meet the requirements of the dynamic and static stiffness and the thermal stability, the appropriate space loading materials were selected and the lightweight design of the reflector was carried out. The flexible support component of the reflector which could be installed and adjusted was designed reasonably, and the finite element analysis of reflector component was obtained by using ANSYS. The results of analysis show that the first-order natural frequency of the component is 3 168.5 Hz;under the action of 1g gravity, the root-mean-square(RMS) value of the reflector surface shape error can reach 8.06 nm, and it can reach 5.58 nmunder the load of 10℃ temperature rise, . while under the coupled action of 1 g gravity and the load of 10℃ temperature rise, the RMS value can reach 11.05 nm.The maximum stress under the action of 10 g acceleration is 2.109 8 Mpa, and the maximum response stress of the weakest link under the action of simple harmonic excitation is 1.284 6 Mpa, all of which fully meet the design index requirements of the reflector component ,verifying the rationality of the suppor structure design.