Simulation of low-frequency effects of pyrotechnic shocks using an electrodynamic shaker

摘要

During the different flight phases of space launchers, pyrotechnic systems fpyrntechnic gates, explosive blots, detonating cords, . .1 produce very high intensity shock levels which may damage same devices or equipments.The Environmental Test Centre of "SNPE Propulsion et Preparotion du Futur" uses a high power electrodynamic shaker. Its specific design allows very high shack levels. With a suitable control system, this device can simulate "low frequencies" effects (from some Hertz to 5000 Hertz) of pyrotechnic shocks by a direct control of the Shock Response Spectrum (SRS).In this paper, we describe the shaker design, its maximum performances, the logic and the different steps of a qualification test in SRS and the advantages/restrictions of the method. We also describe a test example and especially the configuration of the shaker, the instrumentation, the control specifications and the results.