Essais & Simulations n°133

mesures Résumé Pour

mesures Résumé Pour répondre au besoin croissant en termes de précision de positionnement et de pointage des satellites il est de plus en plus nécessaire de caractériser de manière extrêmement précise l’environnement vibratoire généré par certains équipements embarqués. Dans le cadre du projet METOP (satellite d’observation de la terre) deux gros instruments ont été développés nécessitant la mesure de mouvements largement en-dessous d’un Hertz. La bande de fréquence utilisable des bancs d’essais existants s’étant avérée trop limitée, Airbus Defence & Space avec l’aide du CNES a décidé de développer des solutions à la fois sur le plan théorique avec une méthode de post-traitements des données mais aussi un nouveau moyen d’essai qui tient compte des expériences acquises au cours des vingt dernières années. Abstract To take into account the increasing need in terms of positioning and pointing accuracy of spacecrafts, it is more and more necessary to characterize in a very accurate way the vibratory environment generated by some on-board equipment. In the frame of the METOP project (earth observation satellite) two big instruments have been developed which require vibrations measurement much below one Hertz. The useful frequency bandwidth of current microvibration test bench being too limited, Airbus Defence and Space with the support of CNES, has decided to develop solutions in two directions: one theoretical with the post-processing of measured data, the other one consisting in investing in a new test bench designed with the experience of more than twenty years of practice. BIBLIOGRAPHIE 1. Dupuis P-E., Bugeat L-P., Borrien A., Privat M., “Industrialisation of a Microdynamics Test Bench”, Int. Conference on Spacecraft Structures, Materials and Mechanical Testing, Noordwijk, The Netherlands, March 27-29, 1996. 2. Girard A., Chatelain J., Bugeat L-P., “Non Linear Connection Between Structures by Frequency Response Functions”, International Modal Analysis Conference IMAC-XV, Orlando, FL, 1997. 3. Girard A., Cavro E., “Estimation of the motion of a specimen on a shaker without parasitic motions”, 11th European Conference on Spacecraft Structures, Material and Mechanical Testing, Toulouse, France, September 15-17 2009. 4. Wagner M., Messing R., Veal D., Hughes B., Jarvis C., Decobert F., “Micro-vibration Measurement and Susceptibility Testing”, Aerospace testing Seminar, Los Angeles, CA, 2015. 5. Cavro E., Dupuis P-E., Wagner M., “Dynamic Mass Measurements to Improve Microdynamic Tests”, 14th European Conference on Spacecraft Structures, Materials and Environmental Testing (ECSSMET), Toulouse, 27-30 September, 2016. 6. Cavro E., Dupuis P-E., Vidal-Mata F., Privat M., “Recent Development in Micro Vibrations Measurements”, 15th European Conference on Spacecraft Structures, Materials and Environmental Testing (ECSSMET), Noordwijk, The Netherlands, 28 May-1 June, 2018. 7. Dupuis P-E., Cavro E., Vidal-Mata F., Privat M., “Micro Vibration Measurements and Post-processing at Very Low Frequency”, ASTELAB Conference, Paris, 5-6 July, 2018. 44I ESSAIS & SIMULATIONS • N°133 • mai-juin 2018