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A TIME-DOMAIN METHOD FOR THE PREDICTION OF SOUND ATTENUATION IN LINED DUCTS

✍ Scribed by L. SBARDELLA; B.J. TESTER; M. IMREGUN

Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
470 KB
Volume
239
Category
Article
ISSN
0022-460X

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✦ Synopsis

This paper describes the development and application of a time-domain acoustic liner model which is suitable for the simulation of sound propagation and attenuation in lined ducts. The #uid #ow within the duct domain is represented by the non-linear, unsteady Euler equations while the liner model consists of a resistive frequency-independent part and a reactive part which is obtained by solving the one-dimensional Euler equations within the liner cavity. Specialized boundary conditions are used for matching the 1D cavity #ow and the 2D duct #ow. The liner model has been formulated in order to predict the sound attenuation with or without mean #ow, as well as for linear or non-linear sound propagation. The model has been validated in the case of linear pure-tone and N-wave signals by checking against analytical formulations obtained via eigensolutions of the linearized inviscid #ow equations. Very good agreement was obtained for both zero and subsonic mean #ows.

2001 Academic Press L. SBARDELLA EΒΉ AΒΈ.

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