Methodology of Uniaxial Transient Vibration Test for Satellites

摘要

Realistic data for thrust transient, launch vehicle, and satellite characteristics are defined. Dynamic response analysis is performed based on a survey of current methods. For most of the low frequency dynamic flight environment of a satellite, transient testing minimizes the risk of under or overtesting inherent to conventional sine testing. As feasibility of such tests on uniaxial electrodynamic shakers was recently proved, the problem is now the dependance of the test specification on possible variations of launch vehicle and satellite dynamic characteristics. Possible variations of parameters are discussed and a sensitivity analysis is performed. It is found that frequency variations have the greatest influence and must be considered simultaneously. A numerical procedure is developed to compute a worst shock spectrum envelope. Alternatives for transient testing are recommended, including an improved shock synthesis technique, compared to sine testing.