一种基于敏感因子加权的机构动力学仿真方法  

A Simulation Method of the Dynamic Characteristics for Space Optical Mechanisms Based on Weighted Factors

作　　者：于婷婷 连华东[1] 杨柳 赵鑫[1] 梁凤超[1] 范建凯 林喆[1] YU Tingting;LIAN Huadong;YANG Liu;ZHAO Xin;LIANG Fengchao;FAN Jiankai;LIN Zhe(Beijing Institute of Space Mechanics&Electricity,Beijing 100094,China)

机构地区：[1]北京空间机电研究所,北京100094

出　　处：《航天返回与遥感》2023年第3期51-61,共11页Spacecraft Recovery & Remote Sensing

基　　金：国家自然科学基金(62227812)。

摘　　要：为了解决批产高精度调焦机构有限元分析与扫频试验结果存在偏差的问题,提高空间复杂机构设计能力,文章提出了一种基于敏感因子加权系数的机构动力学有限元分析法。该方法基于Hertzian接触理论建立了运动副连接的等效刚度模型,确定了敏感因子及其刚度贡献的关键方向,根据刚度与基频关系以及相关试验数据,为模型中敏感因子分配了加权系数,实现了机构的高精度仿真。利用该仿真方法对某空间相机高精度调焦机构进行仿真分析,并与扫频试验进行对比,结果表明前三阶基频振动特性一致且误差均小于2.8%,验证了该方法的有效性和计算效率,可为高精度空间机构的仿真分析提供一定参考。To reduce of the deviation between analysis and test results and improve the design performance for space complex mechanisms,a dynamic finite element analysis method for space focus adjustment mechanisms is proposed based on sensitive factor weighted coefficients.This method establishes an equivalent stiffness model of the motion pair joints based on the Hertzian contact theory,and clarifies the key direction of the sensitive factor and its stiffness contribution.According to the relationship between stiffness,the fundamental frequency and relevant test data,the weighted coefficients of the sensitive factors in the model are determined,thus achieving high-precision simulation.Using this simulation method,the performance of a high-precision focus adjuststment mechanism in a space camera is analyzed with and without weighted coefficients,and the results are compared with the sweep test ones.The comparisons show that for the first three fundamental frequencies,the vibration characteristics are consistent and the fundamental frequency error is less than 2.8%,verifying the effectiveness of the method and providing a reference for the simulation analysis of high-precision space mechanisms.

关 键 词：空间机构 刚度 加权 有限元分析 振动特性 空间相机 

分 类 号：V423.9[航空宇航科学与技术—飞行器设计]