Comparative Analyses of ESA, NASA and JAXA Signals of Acceleration During the SODI-IVIDIL Experiment
The present work aims to complete the analysis of the vibrational impact generated by the Influence of VIbrations on DIffusion of Liquids, IVIDIL, experiment in a global way. To do so, we have analysed all the episodes which, along the active period between September 2009 and January 2010, accounts for simultaneous accelerometric signals coming from the Columbus (ESA) module, the Destiny (NASA) module and the Pressurized module of the Kibo complex, PM-Kibo, (JAXA) respectively. Signals have been downloaded thanks to the NASA Principal Investigator Microgravity Services, PIMS, website. Vibrational analysis involved the consideration of second and higher order statistical techniques. In addition, a comparative study of the RMS acceleration integrated over one-third octave frequency bands enabled to check if the ISS vibratory limit requirements are everywhere accomplished. In summary it can be concluded that, in the vibratory regime, the experiment in the Columbus module is isolated enough of the Destiny and PM-Kibo ones. In addition, concerning only the Columbus data, the study also concluded that the peculiar energy exchange detected between the nominal frequency of the movement and its third harmonic is due to nonlinearities probably originated by the shaker, the module of translational arrangement mounted on the SODI instrument.
All these results introduce an interesting generic question: is it always correct to consider that the accelerometric data only coming from one module can offer to the Space Station customers a suitable global scenario of the ISS environment?, if not, what is the real extent of these data?
KeywordsAcceleration analysis Microgravity Bispectrum Trispectrum
The present work is part of our participation in the HSF-US/2010-042 and HSF-US/2010-041 ESA projects.
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