To study the acoustic field of propelled light aircraft, a method of in-flight measurements was implemented. The separation of noise sources is achieved by examination of the influence on the acoustic field on the relative set-up of the propeller and the engine. This shows that at high rotational speed, the propeller is the dominant source. Evaluating then the field due to steady/unsteady loading on the blades, one concludes that the former ones are the most acoustically efficients. The analysis fly-over noise measurements, using an original signal processing (doppler effect compensation) makes the results obtained more complete. (Krautzig)


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    Title :

    Propeller light aircraft noise at discrete frequencies


    Additional title:

    Propellergeraeusch von Leichtflugzeugen bei diskreten Frequenzen


    Contributors:
    Dahan, C. (author) / Avezard, L. (author) / Guillien, G. (author) / Malarmey, L. (author) / Chombard, J. (author)

    Published in:

    Publication date :

    1980


    Size :

    10 Seiten, 21 Bilder, 8 Quellen


    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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