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2003-01-01 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Wattiaux David , Conti Calogero , Hadjit R., "Shock qualification facilities of spatial electronic devices using pyrotechnic excitation" in 6th National Congress on Theoretical and Applied Mechanics, Gand, Belgique, 2003

  • Codes CREF : Sciences de l'ingénieur (DI2000), Mécanique (DI1240), Mécanique appliquée générale (DI2100), Mécanique appliquée spéciale (DI2200), Mécanique analytique ou rationnelle (DI1242)
  • Unités de recherche UMONS : Mécanique rationnelle, Dynamique et Vibrations (F703)
Texte intégral :

Abstract(s) :

(Anglais) During space flights, pyrotechnic devices are used for various purposes as booster separation, unfolding solar panels or activation of propellant valves. The fir- ing of these pyrotechnic devices generates a severe shock wave, characterised by a high intensity and a wide frequency range, which can damage the surrounding electronic equip- ments. Test specifications imposed to embarked electronic devices are generally defined as a maximum limit imposed to the Shock Response Spectrum. Specific qualifications facilities have been developed in collaboration with Alcatel ETCA. They are based on sus- pended plate structures supporting the tested electronic de- vice, and submitted to a shock generated by an explosive cord. A trial and error experimental procedure is generally applied to tune the operating parameters in order to satisfy the launcher’s specifications. This paper presents a simulation of the testing procedure in order to predict the Shock Response Spectrum. Such a model facilitates the determination of the adequate operat- ing conditions. It is based on a finite elements model of the structure, which has been updated using an experimental modal anal- ysis. Different excitation models are tested, such as an equivalent mechanical shock located at a fixed point in the vicinity of the explosive charge, or the propagation along the plate of a wave shock. Vibration measurements on the testing device and air pressure measurements have been ex- perimentally obtained.