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A wall-mounted source array for the excitation of incoherent broadband sound fields with prescribed modal distributions in ducts

Record type: Article

In the analysis of broadband sound fields in ducts, for example, turbofan engines, large exhaust stacks, and exhaust mufflers, the assumption of ‘Equal Energy per Mode’ (EEpM) is frequently made. The practical realization of such a sound fields is valuable as a means of, for example, allowing liner attenuation measurements obtained from measurements on different test rigs to be compared directly, or for allowing measurements results to be compared with computer predictions in which the assumption is made. This paper describes a technique in which arrays of sound sources at the wall of a duct are driven by white noise signals to generate a sound field of prescribed modal energy distribution and modal coherence. The number of sources required for effective mode synthesis and the source geometry are also discussed. An example is presented in which ‘EEpM’ broadband sound field is generated up to a maximum non-dimensional frequency of ka=20 using 152 sources.

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Citation

Jeong, W., Joseph, P. and Lee, S. (2006) A wall-mounted source array for the excitation of incoherent broadband sound fields with prescribed modal distributions in ducts Journal of Sound and Vibration, 290, (1-2), pp. 490-499. (doi:10.1016/j.jsv.2004.12.025).

More information

Published date: 2006

Identifiers

Local EPrints ID: 28370
URI: http://eprints.soton.ac.uk/id/eprint/28370
ISSN: 0022-460X
PURE UUID: 72a1de7b-e6db-4e39-b46d-0fca16bc9bef

Catalogue record

Date deposited: 28 Apr 2006
Last modified: 17 Jul 2017 16:01

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