Calculated engine core noise levels, based on NASA Lewis prediction procedures, for five representative helicopter engines are compared with measured total helicopter noise levels and ICAO helicopter noise certification requirements. Comparisons are made for level flyover and approach procedures. The measured noise levels are generally significantly greater than those predicted for the core noise levels, except for the Sikorsky S-61 and S-64 helicopters. However, the predicted engine core noise levels are generally at or within 3 dB of the ICAO noise rules. Consequently, helicopter engine core noise can be a significant contributor to the overall helicopter noise signature.


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    Title :

    Helicopter engine core noise


    Contributors:


    Publication date :

    1982-07-01


    Type of media :

    Miscellaneous


    Type of material :

    No indication


    Language :

    English


    Keywords :




    Helicopter noise

    Cox, C. M. | NTRS | 1983


    Core engine noise

    GEREND, R. / KUMASAKA, H. / ROUNDHILL, J. | AIAA | 1973


    Core Engine Noise

    Schwartz, Ira R. / Nagamatsu, Henry T. / O'Keefe, Jack V. | AIAA | 1975