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Engineering methods to predict noise levels at reference points with known source properties
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-9632-8398
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-7898-8643
2015 (English)In: Applied Acoustics, ISSN 0003-682X, E-ISSN 1872-910X, Vol. 96, 68-74 p.Article in journal (Refereed) Published
Abstract [en]

Two engineering methods are proposed to predict the sound pressure levels at a given point when the sound power level of a noise source is known and the transfer function between the source and the reference point can be obtained. The first method is applicable when the source is surrounded by many reflectors, or inside a box-like structure. A single monopole with average transfer function is suggested for this situation. For a source with a strong directivity placed in an essentially free space, the "box-source" method is recommended to take into account of the source directivity. The total sound power is in this case divided into five independent noise sources which are obtained via ordinary sound power measurement methods. Experimental verifications are made for several cases in laboratory. Satisfactory results are obtained for both methods.

Place, publisher, year, edition, pages
2015. Vol. 96, 68-74 p.
Keyword [en]
Railway noise, Equivalent monopole, Source directivity, Engineering method, Average transfer function, Directional source model
National Category
Other Engineering and Technologies
Identifiers
URN: urn:nbn:se:kth:diva-169235DOI: 10.1016/j.apacoust.2015.03.014ISI: 000355033900008Scopus ID: 2-s2.0-84926058967OAI: oai:DiVA.org:kth-169235DiVA: diva2:821288
Funder
EU, FP7, Seventh Framework Programme, FP7-284877
Note

QC 20150615

Available from: 2015-06-15 Created: 2015-06-12 Last updated: 2017-12-04Bibliographically approved

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Feng, LepingÅbom, Mats

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  • apa
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