Design and tests for a space camera support structure under random vibration responses

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (7) : 208-212.

LI Lin1,2,WANG Dong1,3,KONG Lin1,3,TAN Luyang1,2,YANG Hongbo1

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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.

Key words

space camera / supporting structure / random vibration response / topology optimization / power spectral density

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LI Lin1,2,WANG Dong1,3,KONG Lin1,3,TAN Luyang1,2,YANG Hongbo1. Design and tests for a space camera support structure under random vibration responses[J]. Journal of Vibration and Shock, 2017, 36(7): 208-212

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