A new, phased array of microphones, suitable for the harsh environment of a rocket launch, was built and tested during a static firing of a RS-25 engine. It uses 70 piezo-resistive, dynamic pressure sensors, optimally distributed on a 10.5ft diameter open frame dome structure, and has a 200-ft long cable bundle to carry the signals to a weather-protected cabinet containing the data systems. The test stand was imaged using an infra-red camera and a visible wavelength camera, and the beamformed noise maps were superimposed on the photographs. The first-time data from a full-scale engine test stand showed that the plume deflector at the bottom of the engine to be the primary noise source. The openings of the test stand around the nozzle exit were also found to be noise sources particularly at higher frequencies. The final goal is to use the array during NASA’s Artemis-II launch at Kennedy Space Center.


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    Title :

    Identification of Noise Sources in a Rocket Engine Test Stand using Microphone Phased Array


    Contributors:
    J. Panda (author) / E. D. Crowe (author) / L. A. Langford (author) / E. T. Daley (author) / J. K. R. Hamm (author) / J. W. S. Jr. (author)

    Publication date :

    2014


    Size :

    20 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English







    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