The effect of turbulent loading on the noise radiated by an advanced aircraft propeller is assessed using a spectral conditioning technique which allows the inclusion of the non-linear effects associated with source rotation. The rnethod allows the steady-source noise at a microphone to be estimated by removing the effect of measured on-blade unsteady loading. The operation of the method is demonstrated by using numerically simulated data, demonstrating the effectiveness of the technique in extracting the steady-source sound. Experimental results are presented showing the effect of random loading on the acoustic field of a propeller in an axial flow and at incidence. It is shown that, for the range of conditions and microphone positions considered, the effect of turbulent loading on the radiated noise can vary from about 2 dB - 8 dB, being stronger upstream than downstream.


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    Title :

    Spectral conditioning of propeller noise from broadband sources


    Additional title:

    Die Messung von Flugzeugpropellergeräuschen aus Breitbandquellen mit Spektralverfahren


    Contributors:

    Published in:

    Publication date :

    2000


    Size :

    19 Seiten, 10 Bilder, 21 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English





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