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为了提高结构刚度,利用ANSYS的APDL语言对外径Φ95 mm的一体式3翼次镜支架进行了参数化建模,以基频为目标函数,对构成支架翼形的梁杆和接杆的截面参数进行了优化。优化结果表明:梁杆与接杆的夹角对基频影响显著,基频最高时梁杆与接杆的连接位置临近于基座,但并不在基座根部。在原结构基础上设计了带6螺旋环绕撑筋的新型次镜支架,撑筋显著提高了整体刚度。优化设计的新型次镜支架质量仅增加14.7 g,基频增加33%,横向加速度下次镜安装面变形减小37.5%,可作为适应于力学环境的一种较佳结构。参数优化方法可提高多设计变量条件下的建模、仿真效率和设计水平,优化结果可为质量、体积及遮拦受限的小型一体式次镜支架结构设计提供有力支撑。
In order to improve the structural rigidity, the APDL language of ANSYS was used to parameterize the integral three-wing secondary mirror holder with an outer diameter of Φ95 mm. Taking the fundamental frequency as the objective function, the parameters of the cross-section of the beam and post Optimized. The optimization results show that the angle between the beam and the post has a significant effect on the fundamental frequency. When the fundamental frequency is the highest, the connection position between the post and the post is close to the base, but not at the root of the base. On the basis of the original structure, a new secondary mirror holder with 6-spiral wrap is designed, which enhances the overall stiffness remarkably. The new design of the secondary mirror holder quality increased by only 14.7 g, the fundamental frequency increased by 33%, transverse acceleration next mirror installation surface deformation reduced by 37.5%, can be used as a better adaptation to the mechanical environment. The parameter optimization method can improve the modeling, simulation efficiency and design level under the condition of multiple design variables. The optimized results can provide strong support for the design of the small, integrated secondary mirror holder with limited quality, volume and obstruction.