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Monday, July 8 • 16:50 - 17:10
FULL SCALE ACOUSTIC SOURCE IDENTIFICATION ON VEGA LAUNCH PAD AT LIFT-OFF

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During lift-off, space launchers are submitted to high acoustic levels which can be dramatic for the payload inside the fairing. The present study aimed at improving the acoustic environment of VEGA (Vettore Europeo di Generazione Avanzata) launcher thanks to microphone array analysis. Two years ago, in 2015, a first analysis of this type has provided recommendations for launch pad evolutions in order to reduce the acoustic loads on the fairing. Based on these results, openings on the launch table were covered. We present here new measurement and analysis performed after this change. In Kourou, French Guyana, the time signals measured on a circular array during launcher lift-off are used to identify the acoustic sources on the launch pad, in terms of location and magnitude, thanks to deconvolution method. As for the first campaign, three source scanning plans are defined: two horizontal ones (at the level of the jet deflector and on the table) and a vertical one including the launcher. The overall results provide the evolution with time of acoustic sources on VEGA launch pad for all frequencies of interest. These are then used to extrapolate the acoustic levels to the fairing. Thanks to launch pad change, the acoustic levels are shown to be reduced by 2 dB, for the frequencies of interest and the source localization confirms strong reduction of the sources radiated from the table.

Moderators
KH

Kaveh Habibi

Sr. Aeroacoustics Engineer, Siemens Gamesa Renewable Energy
LM

Luc Mongeau

Prof., McGill University
MR

Michel Roger

Professeur, Ecole Centrale de Lyon

Authors

Monday July 8, 2019 16:50 - 17:10 EDT
St-Laurent 6
  T03 Aero… aircrft noise & vibr., RS01 Aeroacoustics