DEVELOPMENT OF A SIMULATION PROCESS OF THE BEHAVIOUR OF SPACEEQUIPMENT SUBJECTED TO PYROTECHNIC SHOCKS, BASED ONCHARACTERIZATION AND ENVIRONMENTAL TESTS

摘要

Pyrotechnic devices are largely used during satellitelaunch or transfer into final orbit. With the newgeneration of launchers (ex ARIANE 5) and theincrease in the complexity of satellites, the pyrotechnicshock severity increases with the on-board number ofequipment concerned. Although it is very violent, apyrotechnic shock rarely deteriorates structures, buteasily causes dysfunctions or cuts on the electroniccomponents which are sensitive to this propagation ofenergy at high frequencies. For lack of simple andreliable tools for dimensioning, few mechanicalanalyses concerning shocks are carried out beforequalification, and the validation of equipment subjectedto pyrotechnic shocks passes by systematicenvironmental test campaigns. The Mecano-ID testdepartment has developed a shock test facility withmetal-to-metal impact, enabling reproduction of theflight environments of the launcher and thus to applythem to equipment or models of equipment. Severalmodels of shock generator machine have been built toreproduce the various specified shock response spectra.The applicable field is 'far field' shocks with afrequency range going from 100 Hz to 10 KHz. In orderto improve the traditional mechanical analyses of thespace industry (modal analysis, static, sine and randomresponse), Mecano-ID is currently developing asimulation process of the response of a space equipmentsubjected to a shock environment. The proposal for thisprocess is based on estimated calculations by fastdynamic finite element method (MSC.Dytran LS-DYNA)and environmental tests done on a test vehiclewith a metal-to-metal shock machine. The test facilityand a correlation between simulations and tests will bepresented.