ANALYSIS OF A VIBRATION OVERTEST PROBLEM AND A FORCE-LIMITED CONTROL VIBRATION TEST

The traditional vibration test methodology is to measure and control the interface-enviromment of a testing article to a specification.This method is too conservative,it may induce excessive vibration responses at the hardware resonant frequencies,and harm the testing structure.A force-limited vibration test is to measure and control the interface force between the testing article and the shaker to a specification,it can effectively reduce the over-test problem caused by traditional vibration test.The reason for the over-test problem of the traditional vibration test and the principle of over-test compensation of the force-limited vibration test are analyzed.A double control vibration test is put forward,it is to measure and control the interface force and the acceleration of the shacker simultaneously.This method can better simulate the real dynamic environment of the test item.The effect of the force-limited vibration test on the over-test problem is verified by means of numerical calculation.It is also verified that the double control vibration test is the better ideal method to simulate the interface dynamic environment of satellites and rockets.This study provides a theory for application of the force-limited vibration test and the double control vibration test is the better ideal method to simulate the interface dynamic environment of satellites and rockets.This study provides a theory for application of the force-limited vibration test and the double control vibration test in satellite dynamic vibration tests.