Compliance and vegetated-barrier acoustical testing in a purpose-built sound-transmission suite
Random-incidence transmission losses and absorption coefficients of a vegetated noise barrier of Criblock{trade mark, serif} construction were measured without and with plants in a sound-transmission suite built specifically for the purpose, constructed from concrete noise barriers, with the vegetat...
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creator | Hodgson, Murray Daltrop, Shira Peterson, Rick Benedict, Paul |
description | Random-incidence transmission losses and absorption coefficients of a vegetated noise barrier of Criblock{trade mark, serif} construction were measured without and with plants in a sound-transmission suite built specifically for the purpose, constructed from concrete noise barriers, with the vegetated barrier separating source and receiver rooms. The suite was tested for compliance with ASTM E90-09, and found to be substantially but not completely in compliance with respect to uniformity of steady-state levels and surface absorption. It was found that the transmission loss of the vegetated barrier ranged from 42 dB at low frequencies to 66 dB at 1000 Hz; above 1000 Hz only a lower limit of the TL could be determined -- values of 57-62 dB were found. These values are at least 25 dB higher than recommended by BC Ministry of Transportation guidelines. The absorption coefficients of the unplanted and planted barriers were measured; the plants decreased the absorption slightly, from NRC 0.42 to 0.37. |
doi_str_mv | 10.1121/1.4800475 |
format | Conference Proceeding |
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The suite was tested for compliance with ASTM E90-09, and found to be substantially but not completely in compliance with respect to uniformity of steady-state levels and surface absorption. It was found that the transmission loss of the vegetated barrier ranged from 42 dB at low frequencies to 66 dB at 1000 Hz; above 1000 Hz only a lower limit of the TL could be determined -- values of 57-62 dB were found. These values are at least 25 dB higher than recommended by BC Ministry of Transportation guidelines. The absorption coefficients of the unplanted and planted barriers were measured; the plants decreased the absorption slightly, from NRC 0.42 to 0.37.</description><identifier>EISSN: 1939-800X</identifier><identifier>DOI: 10.1121/1.4800475</identifier><identifier>CODEN: PMARCW</identifier><language>eng</language><ispartof>Proceedings of Meetings on Acoustics, 2013, Vol.19 (1)</ispartof><rights>Acoustical Society of America</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://pubs.aip.org/poma/article-lookup/doi/10.1121/1.4800475$$EHTML$$P50$$Gscitation$$H</linktohtml><link.rule.ids>208,310,311,782,786,791,792,796,4514,23937,23938,25147,27932,76392</link.rule.ids></links><search><creatorcontrib>Hodgson, Murray</creatorcontrib><creatorcontrib>Daltrop, Shira</creatorcontrib><creatorcontrib>Peterson, Rick</creatorcontrib><creatorcontrib>Benedict, Paul</creatorcontrib><title>Compliance and vegetated-barrier acoustical testing in a purpose-built sound-transmission suite</title><title>Proceedings of Meetings on Acoustics</title><description>Random-incidence transmission losses and absorption coefficients of a vegetated noise barrier of Criblock{trade mark, serif} construction were measured without and with plants in a sound-transmission suite built specifically for the purpose, constructed from concrete noise barriers, with the vegetated barrier separating source and receiver rooms. The suite was tested for compliance with ASTM E90-09, and found to be substantially but not completely in compliance with respect to uniformity of steady-state levels and surface absorption. It was found that the transmission loss of the vegetated barrier ranged from 42 dB at low frequencies to 66 dB at 1000 Hz; above 1000 Hz only a lower limit of the TL could be determined -- values of 57-62 dB were found. These values are at least 25 dB higher than recommended by BC Ministry of Transportation guidelines. 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The suite was tested for compliance with ASTM E90-09, and found to be substantially but not completely in compliance with respect to uniformity of steady-state levels and surface absorption. It was found that the transmission loss of the vegetated barrier ranged from 42 dB at low frequencies to 66 dB at 1000 Hz; above 1000 Hz only a lower limit of the TL could be determined -- values of 57-62 dB were found. These values are at least 25 dB higher than recommended by BC Ministry of Transportation guidelines. The absorption coefficients of the unplanted and planted barriers were measured; the plants decreased the absorption slightly, from NRC 0.42 to 0.37.</abstract><doi>10.1121/1.4800475</doi><tpages>7</tpages></addata></record> |
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identifier | EISSN: 1939-800X |
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issn | 1939-800X |
language | eng |
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source | AIP Journals Complete; Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals |
title | Compliance and vegetated-barrier acoustical testing in a purpose-built sound-transmission suite |
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