Transmission loss characteristics of an annular cavity with arbitrary port locations using Green's function method

Keskar, Harshad and B, Venkatesham (2017) Transmission loss characteristics of an annular cavity with arbitrary port locations using Green's function method. The Journal of the Acoustical Society of America, 142 (3). pp. 1350-1361. ISSN 0001-4966

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Abstract

The prediction of transmission loss characteristics of a short chamber requires the study of both longitudinal as well as transverse modes. This prompts the development of a three-dimensional (3D) transfer matrix, which can address the wave propagation in all three directions. Accordingly, an analytical methodology for transmission loss characteristics of an annular cavity using Green's function method is presented in this paper. The 3D wave equation is used to derive the mode shape functions for the cavity. The average pressure on the inlet and outlet ports is predicted using the Green's function derived from the mode shapes. Three different port location configurations of the annular cavity are considered for establishing the analytical methodology, viz., face-inlet-face-outlet (FIFO), side-inlet-side-outlet (SISO), and face-inlet-side-outlet (FISO). Numerical model results are used to corroborate the analytical results. The effects of geometrical parameters on the transmission loss are studied.

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IITH Creators:

IITH Creators	ORCiD
B, Venkatesham	http://orcid.org/0000-0003-3651-513X

Item Type:

Article

Uncontrolled Keywords:

CIRCULAR EXPANSION CHAMBER; ACOUSTIC ATTENUATION PERFORMANCE; 4 POLE PARAMETERS; 3-DIMENSIONAL CAVITIES; SPECIAL ATTENTION; MODAL EXPANSION; SIDE INLET; OUTLET; FORMULATION

Subjects:

Physics > Mechanical and aerospace

Divisions:

Department of Mechanical & Aerospace Engineering

Depositing User:

Team Library

Date Deposited:

21 Sep 2017 05:46

Last Modified:

24 Oct 2017 09:54

URI:

http://raiithold.iith.ac.in/id/eprint/3568