What is it about?
This study simulated spacecraft ground vibration tests and its flight cases, and the acceleration responses of the spacecraft vertex were compared based on same translational motion along the spacecraft/launch vehicle (S/LV) interface. For the flight simulations, the frequencies that correspond to the spacecraft vertex acceleration peak response were the modal frequencies of the spacecraft/launch vehicle combination. While for the ground vibration test simulations, the spacecraft resonated at the modal frequency with the S/LV interface held constant. The two simulation results were quite different, which indicates that the present lateral vibration test for spacecraft cannot simulate the flight dynamic environment the NASA-HDBK-7008 requires.
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Why is it important?
The present spacecraft ground lateral vibration test is wrong. 当前航天器地面横向振动试验是错误的。
Perspectives
This article is important because it puts forward and then presents results validating the proposition that coupling between rotation and lateral translation at the base of a satellite is the important parameter when discussing the difference between response of a structure from a shake table test and response of a structure on a launch vehicle. This proposition is much more compelling and understandable than the two degree of freedom model used to explain the validity of force-limited vibration testing.
Zhu Liwen
Read the Original
This page is a summary of: Role of Base Rotation in Spacecraft Vibration Tests of Dynamic Flight Environments, Journal of Spacecraft and Rockets, July 2017, American Institute of Aeronautics and Astronautics (AIAA),
DOI: 10.2514/1.a33667.
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