A 70-microphone phased array, protected to withstand the harsh environment of a rocket test facility, was used to identify noise sources in the Ares I Scale Model Acoustics Test. In the unobstructed burn of a single solid rocket motor, the free-flowing plume itself was found to make a long noise source. The scenario changed completely in launch configurations where a 5%-scale model of the Ares I vehicle was tested in static firings. It was found that the impingement by the plume on various regions of the launch pad constituted the primary noise sources. The scenario is very different from current models, which assume that the plume itself is the noise source and do not account for impingement sources. As expected, the addition of water in the trench and the hole for the plume passage attenuated the associated noise sources. Water injection on the top of the pad (“rainbird”) was found to attenuate only the peripheral sources around the primary plume impingement zone. The noise maps suggest that the minimization of impingement by reducing vehicle drift, reducing plume spillage via increasing the size of the hole, and covering-up leakage paths for the sound waves from the trench will attenuate the liftoff acoustics level.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Microphone Phased Array to Identify Liftoff Noise Sources in Model-Scale Tests


    Beteiligte:
    Panda, J. (Autor:in) / Mosher, R. (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2013-07-29


    Format / Umfang :

    11 pages




    Medientyp :

    Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch






    Identification of Noise Sources in a Model Scale Lift-off Test Using a Microphone Phased Array

    Panda, J. / Mosher, R. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2012



    USE OF A MICROPHONE PHASED ARRAY TO DETERMINE NOISE SOURCES IN ROCKET PLUMES

    Panda, J. / Mosher, R. / American Institute of Aeronautics and Astronautics | British Library Conference Proceedings | 2011