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The measurement and prediction of sound waves of arbitrary amplitude in practical flow ducts

The measurement and prediction of sound waves of arbitrary amplitude in practical flow ducts
The measurement and prediction of sound waves of arbitrary amplitude in practical flow ducts
A study is presented that explores the influence of the peak to mean pressure ratio on the wave action occurring in highly acoustically reactive ducts with significant flow present. Particular practical applications concern predictions of orifice noise emissions from piston engine or compressor intake and exhaust systems, with the effect of acoustic resonances on both excitation and acoustic power transmission. The results indicate that any practical differences between linear and non-linear predictions remain negligibly small when the pressure ratio remains below 1.1, corresponding to 170 dB spl, provided that the influence of all frequency-dependent physical features is included. Above this level of excitation in any lengths of uniform pipe connecting other system components, some new observations demonstrate the extent to which compression wave steepening may be of practical significance in the spectral distribution of the power propagated.
0022-460X
849-861
Davies, P.O.A.L.
e2de24e0-483d-49fb-ad50-703548232c61
Holland, K.R.
90dd842b-e3c8-45bb-865e-3e7da77ec703
Davies, P.O.A.L.
e2de24e0-483d-49fb-ad50-703548232c61
Holland, K.R.
90dd842b-e3c8-45bb-865e-3e7da77ec703

Davies, P.O.A.L. and Holland, K.R. (2004) The measurement and prediction of sound waves of arbitrary amplitude in practical flow ducts. Journal of Sound and Vibration, 271 (3-5), 849-861. (doi:10.1016/S0022-460X(03)00756-9).

Record type: Article

Abstract

A study is presented that explores the influence of the peak to mean pressure ratio on the wave action occurring in highly acoustically reactive ducts with significant flow present. Particular practical applications concern predictions of orifice noise emissions from piston engine or compressor intake and exhaust systems, with the effect of acoustic resonances on both excitation and acoustic power transmission. The results indicate that any practical differences between linear and non-linear predictions remain negligibly small when the pressure ratio remains below 1.1, corresponding to 170 dB spl, provided that the influence of all frequency-dependent physical features is included. Above this level of excitation in any lengths of uniform pipe connecting other system components, some new observations demonstrate the extent to which compression wave steepening may be of practical significance in the spectral distribution of the power propagated.

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Published date: 2004

Identifiers

Local EPrints ID: 10405
URI: http://eprints.soton.ac.uk/id/eprint/10405
ISSN: 0022-460X
PURE UUID: 066a26b1-be80-4fe1-b8c1-72179206a312
ORCID for K.R. Holland: ORCID iD orcid.org/0000-0001-7439-2375

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Date deposited: 13 May 2005
Last modified: 18 Feb 2021 16:39

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Contributors

Author: P.O.A.L. Davies
Author: K.R. Holland ORCID iD

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