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Optimum Design for Inlet and Outlet Locations of Circular Expansion Chamber for Improving Acoustic Performance
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 Title & Authors
Optimum Design for Inlet and Outlet Locations of Circular Expansion Chamber for Improving Acoustic Performance
An, Se-Jin; Kim, Bong-Jun; Jeong, Ui-Bong;
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 Abstract
The acoustic characteristics of expansion chamber will be changed with the variation of inlet/outlet location due to the higher order acoustic mode in a high frequency in which the plane wave theory is not available. In this paper, the acoustic performance of reactive type expansion chamber with circular cross-section is analyzed by using the modified mode matching theory. The sensitivity analysis of four-pole parameters with respect to the location of inlet and outlet is also suggested to increase the acoustic performance. The acoustic power transmission coefficient is used as cost function, and the location of inlet and outlet is used as design variables. The steepest descent method and SUMT algorithm are used for optimization technique. Several results showed that the expansion chamber with optimally located inlet/outlet had better acoustic performance than concentric expansion chamber.
 Keywords
Optimum Design;Muffler;Higher Order Mode;Inlet/Outlet Location;Four Pole Parameter;Transmission Loss;
 Language
Korean
 Cited by
 References
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