针对某高分辨率空间相机结构随机振动加速度响应大的问题，对空间相机支撑结构进行了优化设计。首先，建立了基于随机振动响应分析的数学模型，推导了随机振动均方根响应表达式。然后，基于三点定位原理和双脚架柔性结构原理设计了相机支撑结构，以相机安装点RMS值最小为目标，基频作为约束，建立了相机支撑结构随机响应优化模型，对支撑结构柔性环节位置进行了尺寸优化设计。采用MSC.Patran&Nastran有限元分析软件对优化处理后的支撑结构进行了工程分析，相机安装点随机响应RMS值最大19.6grms。最后，对相机支撑结构进行了随机振动试试验，结果显示：有限元分析结果与试验测量数据符合的较好，最大相对误差为8.2%，所设计的空间相机支撑结构满足空间相机使用要求，验证了所采用优化方法的可行性。
Abstract
In order to solve the problem of too large random vibration acceleration response of a high resolution space camera,the main support structure of the space camera was designed optimally.Firstly,the mechanical model was established based on the random vibration response analysis,and the random vibration root-mean-square response expression was deduced.Then,the camera supporting structure was designed based on the principles of the three-point locationing and the bipod flexible structure.With an objective function of minimizing the acceleration response RMS of the installing point of the camera and the fundamental natural frequency of the structure as a constraint,the optimal model for the random vibration response fo the camera support structure was built.The position of its flexible link was optimized.Using the FE software MSC.Patran & Nastran,the engineering analysis was done for the optimized camera support structure.The results showed that the maximum camera installation point random acceleration response RMS value is 19.6 grms.Finally,the camera support structure was tested with random vibration tests.The results showed that the maximum relative error between analysis results and test results is 8.2%; the designed camera support structure can meet the service requirements of the space camera,the feasibility of the proposed optimization method is verified.
关键词
空间相机 /
支撑结构 /
随机振动响应 /
优化设计 /
功率谱密度
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Key words
space camera /
supporting structure /
random vibration response /
topology optimization /
power spectral density
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