This paper investigates the methods used for rotor rotational noise, impulsive noise from blade/vortex interaction, high speed noise, rotor broadband noise, the various types of fenestron noise, and noise from the turboshaft engines. From the helicopter manufacturer's standpoint i.e. with respect to the prediction capability of the full chain of codes, including unsteady airloads calculation, an analysis of strengths and deficiencies is made and illustrated with experimental correlations. From this point of view, the fenestron is hovering flight and the rotational noise of rotors are both satisfactorily predicted, but in the event of interactions, the load calculation does not offer the full desired accuracy. Research regarding high speed noise is in progress and the research on broadband noise must be resumed. As regards turboengines, there is no alternative to the experimental approach for the helicopter manufacturer.


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    Title :

    Prevision du Bruit Externe des Helicopteres: Les Methodes Numeriques Vues Par UN Industriel (Predicting Helicopter External Noise: Numerical Methods as Conceived by an Industrialist)


    Contributors:
    F. Toulmay (author) / D. Falchero (author) / G. Arnaud (author)

    Publication date :

    1995


    Size :

    17 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English




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