Master Thesis - OUFTI-1

Next year, several tests will have to be performed to validate this model and to verify
the exact fulllment of the ESA requirements.
Now, the last analysis which must be performed on OUFTI-1, concerns random vibrations.
5.5 Random vibration
This analysis is based on the characteristics of the LV which is selected. Indeed, this
study needs several information about the vibration environment that the satellite has to
withstand during launch, and these information are specic to each launcher.
For CubeSats, this analysis is generally limited to random vibration. These vibrations
are generated by the propulsion system of the launcher and by the vibration-acoustic
response of adjacent structures. Maximum excitation levels occured during the principal
stage ignition. To characterize these vibrations, each launcher possesses its own PSD. The
typical PSDs of several LVs, at qualication level, are given in Figure 5.14. The last version
of the Vega PSD is given in Figure 5.15.
Figure 5.14: PSD of several LVs at qualication level [60]
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