Atmospheric sound propagation in a stratified moving media: Application of the semi analytic finite element method.

Kirby, R

Atmospheric sound propagation in a stratified moving media: Application of the semi analytic finite element method.

Kirby, R

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Publisher:: ACOUSTICAL SOC AMER AMER INST PHYSICS
Publication Type:: Journal Article
Citation:: J Acoust Soc Am, 2020, 148, (6), pp. 3737
Issue Date:: 2020-12

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Field	Value	Language
dc.contributor.author	Kirby, R https://orcid.org/0000-0002-3520-1377
dc.date.accessioned	2021-01-10T22:43:02Z
dc.date.available	2021-01-10T22:43:02Z
dc.date.issued	2020-12
dc.identifier.citation	J Acoust Soc Am, 2020, 148, (6), pp. 3737
dc.identifier.issn	0001-4966
dc.identifier.issn	1520-8524
dc.identifier.uri	http://hdl.handle.net/10453/145249
dc.description.abstract	This article presents a finite element based solution of the exact governing wave equation for a stratified inhomogeneous moving media. The model is applied to a two dimensional range independent problem in outdoor sound propagation in which the ground is treated as perfectly reflecting. The sound pressure field is expanded as a sum over eigenmodes propagating in the range direction, and the semi analytic finite element method is used to solve the governing eigenequation. This delivers faster solution times when compared to traditional finite element based methods while simultaneously accommodating continuous variations in fluid properties in the vertical direction. In principle, the method converges toward the exact solution and so delivers a benchmark method for range independent problems. The method is shown to provide excellent agreement with analytic solutions, and good convergence is demonstrated for more complex problems, including temperature inversions and logarithmic profiles for wind velocity. Finally, qualitative comparisons are made against infrasound predictions, including those obtained using wide angle parabolic equations. The method is shown to provide a focussed image of the sound pressure field over large distances, as well as to reproduce multiple turning points and ground interactions.
dc.language	eng
dc.publisher	ACOUSTICAL SOC AMER AMER INST PHYSICS
dc.relation.ispartof	J Acoust Soc Am
dc.relation.isbasedon	10.1121/10.0002912
dc.rights	info:eu-repo/semantics/closedAccess
dc.subject.classification	Acoustics
dc.title	Atmospheric sound propagation in a stratified moving media: Application of the semi analytic finite element method.
dc.type	Journal Article
utslib.citation.volume	148
utslib.location.activity	United States
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
dc.date.updated	2021-01-10T22:42:38Z
pubs.issue	6
pubs.publication-status	Published
pubs.volume	148
utslib.citation.issue	6

Abstract:

This article presents a finite element based solution of the exact governing wave equation for a stratified inhomogeneous moving media. The model is applied to a two dimensional range independent problem in outdoor sound propagation in which the ground is treated as perfectly reflecting. The sound pressure field is expanded as a sum over eigenmodes propagating in the range direction, and the semi analytic finite element method is used to solve the governing eigenequation. This delivers faster solution times when compared to traditional finite element based methods while simultaneously accommodating continuous variations in fluid properties in the vertical direction. In principle, the method converges toward the exact solution and so delivers a benchmark method for range independent problems. The method is shown to provide excellent agreement with analytic solutions, and good convergence is demonstrated for more complex problems, including temperature inversions and logarithmic profiles for wind velocity. Finally, qualitative comparisons are made against infrasound predictions, including those obtained using wide angle parabolic equations. The method is shown to provide a focussed image of the sound pressure field over large distances, as well as to reproduce multiple turning points and ground interactions.

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http://hdl.handle.net/10453/145249