Guided wave propagation in cylindrical ducts with elastic walls enclosing a fluid moving with a uniform velocity

Kirby, R; Duan, W

Guided wave propagation in cylindrical ducts with elastic walls enclosing a fluid moving with a uniform velocity

Kirby, R

Duan, W

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Publication Type:: Journal Article
Citation:: Wave Motion, 2019, 85 pp. 1 - 9
Issue Date:: 2019-01-01

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Field	Value	Language
dc.contributor.author	Kirby, R https://orcid.org/0000-0002-3520-1377	en_US
dc.contributor.author	Duan, W	en_US
dc.date.available	2021-01-01T18:04:11Z
dc.date.issued	2019-01-01	en_US
dc.identifier.citation	Wave Motion, 2019, 85 pp. 1 - 9	en_US
dc.identifier.issn	0165-2125	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128886
dc.description.abstract	© 2018 Elsevier B.V. Theoretical models for elastic wave propagation in fluid filled ducts normally neglects mean fluid flow. However, in many engineering applications the velocity of the fluid may influence the modal characteristics of the duct, for example in gas pipelines, turbomachinery applications and ventilation systems. Accordingly, the influence of a mean uniform fluid flow on acoustically driven duct wall vibration is analysed here for a cylindrical geometry. The semi-analytic finite element method is used to couple the elastodynamic wave equation for the duct wall to the convected wave equation for sound propagation in a uniform fluid flow. A one dimensional finite element approach is described and this is used to find the coupled eigenmodes for the duct. Under certain conditions, a uniform mean flow is seen to significantly affect the phase speed for different eigenmodes, and it is shown that this may cause energy to transfer from the fluid to the surrounding wall at frequencies much lower than those seen without mean flow. This behaviour has the potential to increase sound radiation from ducts at lower frequencies when mean flow is present.	en_US
dc.relation.ispartof	Wave Motion	en_US
dc.relation.isbasedon	10.1016/j.wavemoti.2018.10.008	en_US
dc.rights	info:eu-repo/semantics/openAccess
dc.subject.classification	Applied Mathematics	en_US
dc.title	Guided wave propagation in cylindrical ducts with elastic walls enclosing a fluid moving with a uniform velocity	en_US
dc.type	Journal Article
utslib.citation.volume	85	en_US
utslib.for	0102 Applied Mathematics	en_US
utslib.for	0203 Classical Physics	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
utslib.copyright.status	open_access	*
pubs.publication-status	Published	en_US
pubs.volume	85	en_US

Abstract:

© 2018 Elsevier B.V. Theoretical models for elastic wave propagation in fluid filled ducts normally neglects mean fluid flow. However, in many engineering applications the velocity of the fluid may influence the modal characteristics of the duct, for example in gas pipelines, turbomachinery applications and ventilation systems. Accordingly, the influence of a mean uniform fluid flow on acoustically driven duct wall vibration is analysed here for a cylindrical geometry. The semi-analytic finite element method is used to couple the elastodynamic wave equation for the duct wall to the convected wave equation for sound propagation in a uniform fluid flow. A one dimensional finite element approach is described and this is used to find the coupled eigenmodes for the duct. Under certain conditions, a uniform mean flow is seen to significantly affect the phase speed for different eigenmodes, and it is shown that this may cause energy to transfer from the fluid to the surrounding wall at frequencies much lower than those seen without mean flow. This behaviour has the potential to increase sound radiation from ducts at lower frequencies when mean flow is present.

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http://hdl.handle.net/10453/128886