Research On The Capability Of Resisting The Launching Impact For The Single Gimbal Control Moment Gyroscope

As part of most spacecraft, the single gimbal control moment gyroscope(SGCMG for short) plays a primordial role in controlling the attitude of thespacecraft. So SGCMG is of critical importance for the stability of thespacecraft and is crucial to the whole mission of the flight. The impact from theexternal during the entire life of the SGCMG may cause damage to the structureof the SGCMG, so it necessary to have enough knowledge of the capability ofresisting the launching impact. Based on the real environment of impact that theSGCMG suffered, the study of simulation methods for the shock response of theSGCMG is as follows:First, based on the theory of impact dynamics and shock response spectrum，the time domain loads is generated with a series of sine wave which ismultiplied by a sine window and make the complex loads can produce the sameshock response spectrum as the actual impact environmental does.Secondly, With the help of Matlab, compile a software which integratedthe method of generating the time domain loads so that it can produce the timedomain loads which can be used for the shock response spectrum analysis ofspacecraft such as the SGCMG.Third, apply the classic half-sine wave shock load to the simple multiple-degree-of-freedom system as well as single degree of freedom system. Thencompare the response to the generated time domain load which applied to thesame structure as the classic loads does, it can be found that the latter cansimulate the real loads the structure suffered more accurately when using theprinciple of equivalent damage as criterion.At last, build the finite element mesh based on the actual structure ofSGCMG and check its validity. And then do a shock response spectrum analysiswith the SGCMG finite element model to see whether it can bear the shockenvironment it would be suffered and how much load it could be born. ResultsIndicate that the SGCMG would not be damaged when suffered the launchingimpact, and there is enough safe margin.