Theoretical and experimental investigation of the insertion loss of a dissipative muffler

Christian Pommer, Viggo Tarnow

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    By using a global theory of sound propagation in a circular duct with a dissipative material, the equivalent acoustical impedance of the cross section of the duct was calculated at low frequencies. Plane wave theory was then used to calculate the four-pole parameters of the duct using empirical formulas of the propagation constant and specific impedance of a dissipative porous material. The insertion loss of a single chamber dissipative muffler was calculated for different geometries and dissipative materials, and the insertion loss was measured using two microphone probes and white noise. The measurements were performed with different geometries and with different porous materials. The acoustical properties of the porous materials were calculated on the basis of the measured flow resistance and the calculated acoustical properties were compared with results obtained by using a standing wave tube method. A good agreement was found between the calculated and measured insertion loss of the single chamber dissipative muffler in the frequency range below the cutoff frequency of the muffler.
    Original languageEnglish
    JournalAcoustical Society of America. Journal
    Issue numberS1
    Pages (from-to)S9-S9
    Publication statusPublished - 1986
    Event112th Meeting of the Acoustical Society of America - Anaheim, CA, United States
    Duration: 8 Dec 198612 Dec 1986
    Conference number: 112


    Conference112th Meeting of the Acoustical Society of America
    Country/TerritoryUnited States
    CityAnaheim, CA


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