A new wall-mounted phased microphone array was designed, built, and calibrated for testing in closed or open test section wind tunnels. Two configurations were evaluated - one with microphone plate flush with the tunnel surface and the other with microphone plate recessed behind a porous screen. The arrays were successfully operated to Mach number of 0.4 and were calibrated using an in-flow speaker source during a recent study at the AEDC NFAC 40- by 80-Ft Wind Tunnel at NASA Ames.


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    Title :

    Low-Cost Phased Microphone Array Design for Moderate-Scale Aeroacoustics Tests


    Contributors:

    Conference:

    2014 Seedling Seminar ; 2014 ; Moffett Field, CA, United States


    Publication date :

    2014-02-19


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English






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