The individual propeller sources of the Joby Aviation aircraft are separated using an order tracking filter on measurement data and computed using high- fidelity computational fluid dynamics (CFD) to quantify the relative contributions to the total noise. Computational results are verified against experimental data for hover and steady level flight at 60 knots and demonstrate very good agreement of both overall sound pressure level magnitude and directivity. The propeller source separation for hover shows good agreement between the methods except for the inboard propellers, and it is expected that the assumptions in the CFD model do not accurately capture the flight test condition. Both methods are able to separate the higher tonal levels generated by the tail propellers due to the aerodynamic interaction. Overall, considering the discrepancies between the CFD model and flight test, the agreement in Vold-Kalman-filtered results and prediction yields confidence that the separation method is successful.


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    Title :

    Identification and Computation of Individual Propeller Acoustics of the Joby Aviation Aircraft


    Contributors:
    A. D. Thai (author) / J. J. Bain (author) / K. A. Pascioni (author)

    Publication date :

    2024


    Size :

    14 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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