Effects of the top edge impedance on sound barrier diffraction

Huang, X; Zou, H; Qiu, X

Effects of the top edge impedance on sound barrier diffraction

Huang, X Zou, H Qiu, X

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Publisher:: MDPI AG
Publication Type:: Journal Article
Citation:: Applied Sciences (Switzerland), 2020, 10, (17), pp. 6042-6042
Issue Date:: 2020-09-01

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Field	Value	Language
dc.contributor.author	Huang, X
dc.contributor.author	Zou, H
dc.contributor.author	Qiu, X https://orcid.org/0000-0002-5181-1220
dc.date.accessioned	2021-06-21T01:06:21Z
dc.date.available	2021-06-21T01:06:21Z
dc.date.issued	2020-09-01
dc.identifier.citation	Applied Sciences (Switzerland), 2020, 10, (17), pp. 6042-6042
dc.identifier.issn	1454-5101
dc.identifier.issn	2076-3417
dc.identifier.uri	http://hdl.handle.net/10453/149668
dc.description.abstract	Sound barriers can be configured with different top edge impedance to improve their noise control performance. In this paper, the integral equation method was used to calculate the sound field of a barrier with various top edge impedance, and the effects of the barrier top edge impedance on sound barrier diffraction were investigated. The simulation results showed that the noise reduction performance of a sound barrier with a soft boundary on its top edge was larger than that with a hard boundary, but there were some impedance values which, if assigned to the top edge boundary, would give the sound barrier even better noise reduction performance. It was found that the sound barrier with a good top edge impedance formed a dipole-like radiation pattern above the barrier to expand the effective range of the shadow zone. The research discoveries reported in this paper point out the potentials of using acoustics metamaterials or active control methods to implement the desired good impedance on the top edge of a sound barrier for better noise reduction.
dc.language	en
dc.publisher	MDPI AG
dc.relation.ispartof	Applied Sciences (Switzerland)
dc.relation.isbasedon	10.3390/app10176042
dc.rights	info:eu-repo/semantics/openAccess
dc.title	Effects of the top edge impedance on sound barrier diffraction
dc.type	Journal Article
utslib.citation.volume	10
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Mechanical and Mechatronic Engineering
utslib.copyright.status	open_access	*
dc.date.updated	2021-06-21T01:06:16Z
pubs.issue	17
pubs.publication-status	Published
pubs.volume	10
utslib.citation.issue	17

Abstract:

Sound barriers can be configured with different top edge impedance to improve their noise control performance. In this paper, the integral equation method was used to calculate the sound field of a barrier with various top edge impedance, and the effects of the barrier top edge impedance on sound barrier diffraction were investigated. The simulation results showed that the noise reduction performance of a sound barrier with a soft boundary on its top edge was larger than that with a hard boundary, but there were some impedance values which, if assigned to the top edge boundary, would give the sound barrier even better noise reduction performance. It was found that the sound barrier with a good top edge impedance formed a dipole-like radiation pattern above the barrier to expand the effective range of the shadow zone. The research discoveries reported in this paper point out the potentials of using acoustics metamaterials or active control methods to implement the desired good impedance on the top edge of a sound barrier for better noise reduction.

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http://hdl.handle.net/10453/149668