Structure optimization design of small-sized integrated support bracket of secondary mirror
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摘要: 为了提高结构刚度，利用ANSYS的APDL语言对外径椎95mm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14.7g，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。Abstract: To enhance the structure stiffness, parametric model of small-sized integrated tri-vane support bracket of secondary mirror with a 95-mm outside diameter was built by APDL language of ANSYS, and vane section parameters of the beam and the connecting pole were optimized considering fundamental frequency as the objective function. Optimized result indicated that the angle of the beam and the connecting pole evidently influenced fundamental frequency and their juncture location was near the base seat but not just at the root at the highest fundamental frequency. Based on primitive structure, new type of support bracket of secondary mirror with 6 spiral surrounded supporting ribs was designed, and supporting ribs greatly improved total structure stiffness. After optimization design, this new structure with only a 14.7 g mass increase had excellent performance that fundamental frequency was increased by 33% and mounting interface deformation of secondary mirror was reduced by 37.5% under transverse acceleration, and thus it can be a good structure adapted to mechanics environment. Parametric optimization method may improve the efficiency of modeling and simulation with multiple design variables and also the design level. Optimized result can provide powerful support for structure design with limited weight, volume and obscuration area.
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[1] Zhang Lei, Jin Guang. Structure design and modes analysis for the truss of light high resolution space camera [J]. Chin J Space Sci, 2008, 28(3): 260-263. (in Chinese) 张雷, 金光. 轻型空间相机桁架结构设计与模态分析[J]. 空间科学学报, 2008, 28(3): 260-263. [2] [3] [4] Xin Hongwei, Yang Jinsong, Gao Minghui, et al. Support design for secondary mirror of high resolution space telescope [J]. Infrared and Laser Engineering, 2011, 40(9): 1724-1729. (in Chinese) 辛宏伟, 杨近松, 高明辉, 等. 高分辨力空间遥感器次镜支 撑设计[J]. 红外与激光工程, 2011, 40(9): 1724-1729. [5] [6] Yang Liwei, Li Zhilai, Bao He. Design for structure of space camera based on the theory of statically determinate spatial frameworks [J]. Opto-Electronic Engineering, 2010, 37(11): 73-77. (in Chinese) 杨利伟, 李志来, 鲍赫. 基于静定桁架原理的相机结构设 计[J]. 光电工程, 2010, 37(11): 73-77. [7] Trent Newswander, Blake Crowther. Optical system materials selection using performance indices in a simultaneous optimization approach [C]//Proceedings of SPIE, Optical Materials and Structures Technologies IV, 2009, 7425: 0201-0214. [8] [9] [10] Ge Zhiliang, Zhu Nenghong. The optimization design of 1 meter primary mirror support system [J]. Annals of Shanghai Observatory Academia Sinica, 2008, 29: 132-138. (in Chinese) 葛志梁, 朱能鸿. 用ANSYS 优化一米望远镜主镜18 点底 支承位置[J].中国科学院上海天文台年刊, 2008, 29: 132-138. [11] Shan Baozhong, Wu Keyong, Lu E. Optimum design of space cameras based on finite element method [J]. Optics and Precision Engineering, 2002, 10 (1): 116-120. (in Chinese) 单宝忠, 武克用, 卢锷. 结合有限元法的空间相机优化设 计.[J]. 光学精密工程, 2002, 10(1): 116-120. [12] [13] [14] Geng Qixian, Yang Hongbo, Li Yanwei. Optimum method of backside support position for large-aperture primary mirror with flat rear surface [J]. Optical Technique, 2007, 33 (6): 889-891. (in Chinese) 耿麒先, 杨洪波, 李延伟. 大口径平背形主镜背部支撑位 置优化计算方法[J]. 光学技术, 2007, 33(6): 889-891. [15] Zhang Linbo, Ren Ge, Chen Hongbin. Dynamic analysis for supporting structure of crossed-plate type [J]. Optics and Precision Engineering, 2003, 11(5): 472-476. (in Chinese) 张林波, 任戈, 陈洪斌. 四翼十字形中心支撑结构的动力 学分析[J]. 光学精密工程, 2003, 11(5): 472-476. [16] [17] Chen Rongli, Zhang Yukang, Fan Xuewu, et al. Design of bracket structure for the second mirror of space high resolution CCD camera [J]. Acta Photonica Sinica, 2004, 33 (10): 1251-1254. (in Chinese) 陈荣利, 张禹康, 樊学武, 等. 高分辨率CCD 相机次镜支 架最佳结构设计[J]. 光子学报, 2004, 33(10): 1251-1254. -
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