Computer Science – Sound
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.558..471m&link_type=abstract
Proceedings of the 5th International Symposium on Environmental Testing for Space Programmes Noordwijk, The Netherlands (ESA SP-
Computer Science
Sound
Scientific paper
The European project manned module Columbus, as part of the International Space Station has been conceived to allow scientific experiments on micro- gravity environment. In order to face against this challenging Design goal, Alenia Spazio developed a dedicated control approach, based on budget allocation of the mechanical power, covering the design, the Analysis and the Verification aspects from system level down to the equipment one. This Control method covers both the evaluations by analysis and/or by testing of the Columbus Structural and Vibro-acoustic transmission paths and the characterization of the disturbers (as Environment Control Life System fans, Thermal Control System pumps and valves, etc.) in terms of force at the equipment interfaces and Sound power Level emitted by the disturbers in the surrounding volume. A dedicated methodology on how to derive the induced disturber's interface forcing functions has been developed in the frame of this project.This paper reports the most significant outcomes during the whole verification and test process at equipment and system level for the derivation of the disturber forcing function. The originality of the method is based on the fact that in the frame of the Columbus Design/Verification cycle, testing has been done at equipment and at system level for the : a) derivation of the equipment Forcing Function when installed on a reference base-plate b) derivation of the disturbers Forcing function when installed o Columbus in the frame of the complete Micro-gravity System Test that allowed both the characterization of : - the structural and the vibro-acoustic system transmissibility by the use of artificial exciters (as shakers and sound source) - the micro-gravity Environment by the Columbus disturbers activation c) Definition of a combination method of forcing function in order to get similar results coming function in order to get similar results coming from both the equipment characterization standing- alone and from the equipment characterization when installed on Columbus. Samples of the comparison between the forcing functions derived from the equipment tests and from system test will confirm the robustness and the correctness of the combination method and control approach from system level down to equipment one.By this industrial experience developed on ESA-Columbus project, Alenia Spazio got the needed skill and sound database for the Design of the next generation of Space laboratories and Payloads for scientific research on Micro-gravity field.
Martini Manuele
Marucchi-Chierro P.
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