空间二维转台模型参数响应面选调优化  

Response-surface selection optimization of FEA parameter for two-dimensional space turntable

作　　者：张昊苏[1] 王振宇 曹钰 上官爱红 谢友金[1,3] 王熹 苏盛明 姜泳帆 ZHANG Haosu;WANG Zhenyu;CAO Yu;SHANGGUAN Aihong;XIE Youjin;WANG Xi;SU Shengming;JIANG Yongfan(Xi'an Institute of Optics and Precision Mechanics,Chinese Academy of Sciences,Xi'an 710119,China;Innovation Academy for Microsatellites of Chinese Academy of Sciences,Shanghai 201203,China;Key Laboratory of Space Precision Measurement Technology,Chinese Academy of Sciences,Xi'an 710119,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西安光学精密机械研究所,陕西西安710119 [2]中国科学院微小卫星创新研究院,上海201203 [3]中国科学院空间精密测量技术重点实验室,陕西西安710119 [4]中国科学院大学,北京100049

出　　处：《光学精密工程》2024年第23期3446-3456,共11页Optics and Precision Engineering

基　　金：国家自然科学基金资助项目(No.62301558);中国科学院青年创新促进会资助项目(No.2022405)。

摘　　要：为提高空间光学系统的侦察和监视效能,降低星上产品质量及功耗,优化星上资源配置,针对空间二维转台进行轻量化设计以提高其负载比。提出了一种适用于空间二维转台的模型参数响应面选调优化方法,通过有限元仿真与力学试验结合的手段提升力学仿真的计算精度。首先,建立结构的有限元力学网格模型,通过显著性分析选取合适的仿真参数作为匹配对象,通过最小二乘法得到二次项响应面系数矩阵,并对响应面的有效性进行评价;最后,通过优化算法得到修正后的模型参数。采用匹配后的有限元模型对二维转台进行力学分析,得到了100 Hz内结构的模态频率、特征点低频正弦振动加速度响应、特征点随机振动应力响应等三类结构响应的分析结果,该结果与力学试验的最大误差相比匹配前分别由8%降至3%,17%降至4.9%,8.5%降至2.2%。该方法有效提升了力学仿真的计算精度,并成功应用于某型号的二维转台研制,使其负载比由上一代型号的0.6提升到1.6。To enhance the efficiency of reconnaissance and surveillance in space optical systems,reduce the mass and power consumption of onboard payloads,and optimize onboard resource allocation,a lightweight design for a two-dimensional turntable is developed to improve its payload ratio.This paper presents an optimization method for selecting FEA parameter response surfaces tailored to two-dimensional turntables,enhancing mechanical simulation accuracy through the integration of FEA simulations and mechanical tests.First,an FE mechanical mesh model of the structure is established.Significant simulation parameters are identified as matching targets through significance analysis.The quadratic response surface coefficient matrix is then derived using the least square method,and the response surface's effectiveness is evaluated.Finally,the optimized model parameters are determined using an optimization algorithm.Utilizing the matched FE model,mechanical analysis of the two-dimensional turntable is conducted,and results for three structural responses below 100 Hz-modal frequency,low-frequency sinusoidal vibration acceleration response at characteristic nodes,and random vibration stress response at characteristic nodes-are obtained.Compared to dynamic tests,the maximum error in results decreased from 8%to 3%,17%to 4.9%,and 8.5%to 2.2%,respectively.This approach significantly improves mechanical simulation accuracy,fulfilling engineering application requirements.It has been successfully applied to the development of a two-dimensional turntable,increasing its payload ratio from 0.6 in the previous generation to 1.6.

关 键 词：空间二维转台 力学仿真 计算精度 负载比 

分 类 号：TH133[机械工程—机械制造及自动化] V11[航空宇航科学与技术—人机与环境工程] V476