An improved method for the design of expansion-chamber mufflers is described and applied to the task of reducing exhaust noise generated by a helicopter. The method is an improvement of standard transmission-line theory in that it accounts for the effect of the mean exhaust-gas flow on the acoustic-transmission properties of a muffler system, including the termination boundary condition. The method has been computerized, and the computer program includes an optimization procedure that adjusts muffler component lengths to achieve a minimum specified desired transmission loss over a specified frequency range. A printout of the program is included together with a user-oriented description. (Author)


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    Titel :

    An Improved Method for Design of Expansion-Chamber Mufflers with Application to an Operational Helicopter


    Beteiligte:
    T. L. Parrott (Autor:in)

    Erscheinungsdatum :

    1973


    Format / Umfang :

    73 pages


    Medientyp :

    Report


    Format :

    Keine Angabe


    Sprache :

    Englisch