Influence of anisotropic liners on the attenuation of sound in circular ducts | Zendy

John Sun | Zendy; Ali H. Nayfeh | Zendy

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Influence of anisotropic liners on the attenuation of sound in circular ducts

Author(s) -

John Sun,

Ali H. Nayfeh

Publication year - 1976

Publication title -

the journal of the acoustical society of america

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.619

H-Index - 187

eISSN - 1520-8524

pISSN - 0001-4966

DOI - 10.1121/1.380971

Subject(s) - duct (anatomy) , attenuation , anisotropy , mach number , acoustic attenuation , acoustics , mechanics , materials science , porous medium , mean flow , physics , porosity , optics , turbulence , composite material , anatomy , medicine

An analysis is presented of the sound propagation and attenuation in a circular duct carrying a uniform mean flow and lined with an anisotropic porous material backed by cellular cavities. A combination of a fourth‐order Runge–Kutta routine and a Newton–Raphson procedure is used to determine the effects of the liner properties, the flow Mach number, and the sound frequency on the attenuation of spinning and nonspinning modes. The results show that low‐frequency noise is better attenuated by anisotropic liners. The optimum liner is the one whose axial resistivity increases with increasing frequency.Subject Classification: [43]20.45, [43]20.35; [43]50.40.

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