Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Single layer planar near-field acoustic holography for compact sources and a parallel reflector
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0001-5723-9571
KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.ORCID iD: 0000-0002-3609-3005
2016 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 380, 129-145 p.Article in journal (Refereed) Published
Abstract [en]

We consider the problem of planar near-field acoustic holography (PNAH) and introduce a new reconstruction method that can be used to process single layer pressure measurements performed in the presence of a reflective surface that is parallel to the measurement plane. The method is specially tailored for compact sources, or for problems in which the scattered field due to the source can be neglected. The approach consists in formulating a seismic model (WRW model) in wavenumber–space and employ it for sound source reconstructions. The proposed method is validated with numerical and experimental data, and, although the most accurate results are obtained when an estimate of the surface impedance is known beforehand, we show that it can substantially improve the reconstruction performance with respect to that of free-field PNAH.

Place, publisher, year, edition, pages
Elsevier, 2016. Vol. 380, 129-145 p.
Keyword [en]
NAH, Feld separation techniques, Reflective environments
National Category
Fluid Mechanics and Acoustics
Research subject
Vehicle and Maritime Engineering
Identifiers
URN: urn:nbn:se:kth:diva-189196DOI: 10.1016/j.jsv.2016.06.012ISI: 000380760300007Scopus ID: 2-s2.0-84977573561OAI: oai:DiVA.org:kth-189196DiVA: diva2:944082
Funder
Swedish Research Council, 621-2012-3723
Note

QC 20160629

Available from: 2016-06-28 Created: 2016-06-28 Last updated: 2017-11-28Bibliographically approved
In thesis
1. Sound field separation with microphone arrays
Open this publication in new window or tab >>Sound field separation with microphone arrays
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Sound field analysis is a fundamental tool in the design, manufacturing, testing and diagnosis of machines and transportation means, as well as the legislations that regulate noise levels in order to minimize environmental pollution. Customary solutions to the problem of sound field analysis are microphone array technologies such as near-field acoustic holography (NAH) and beamforming. One of the challenges of using these technologies often lies in the difficulty for separating disturbing sounds from the target source, specially when these are correlated. For example, NAH requires that no reflecting surfaces are found in the vicinity of the array, which is in theory only possible in an echo-free chamber. On the other hand, beamforming is most suitably used to separate uncorrelated sound sources, which is not the case of, for instance, the noise generated by the contact between the wheel of a train and a railway track. The present thesis examines the research problems of separating a sound source from its reflections, and separating the rail noise from the total noise radiated by a passing train. The overall goal of the thesis is to push the limits of microphone array technologies in the context of sound field separation, to the end of minimizing the cost and complexity of measurements and analyses. The proposed separation methods are formulated in the wavenumber domain, and the measurements are done with uniform single layer microphone arrays. The problem of separating reflections is addressed in three different papers: (i) compact sources and a parallel reflector, (ii) planar source and a parallel reflector, and (iii) a perpendicular reflector with respect to the microphone array, and the common requirement is the knowledge of the reflector impedance. The problem of separating rail noise is studied in a fourth paper, and the proposed method is formulated such that it does not require prior knowledge of the rail properties. Upon the findings obtained in the papers, a comprehensive description of areas for future work, as well as strategies to approach them, is given at the end of the thesis. 

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2017. 45 p.
Series
TRITA-AVE, ISSN 1651-7660 ; 2017:79
Keyword
Sound field separation, Microphone arrays, Near-field acoustic holography, Reflecting surfaces, Railway rolling noise
National Category
Fluid Mechanics and Acoustics Vehicle Engineering Signal Processing
Research subject
Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-217811 (URN)978-91-7729-602-7 (ISBN)
Public defence
2017-12-15, Kollegiesalen, Brinellvägen 8, KTH-huset (tr. 4), Stockholm, 09:15 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 621-2012-3723EU, Horizon 2020, 636032
Note

QC 20171117

Available from: 2017-11-17 Created: 2017-11-16 Last updated: 2017-11-17Bibliographically approved

Open Access in DiVA

Single layer planar near-field acoustic holography for compact sources and a parallel reflector(4370 kB)58 downloads
File information
File name FULLTEXT01.pdfFile size 4370 kBChecksum SHA-512
13931a0429c44f261b93f640f14a54eb9c1ebb7664f13b93ae7d0b4779953f1be41fd7844e1047d4b96c2c0215ef923113e67fa313e71cf094bdd799d09fc51e
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopusSingle layer planar near-field acoustic holography for compact sources and a parallel reflector

Authority records BETA

Zea, EliasLopez Arteaga, Ines

Search in DiVA

By author/editor
Zea, EliasLopez Arteaga, Ines
By organisation
Marcus Wallenberg Laboratory MWL
In the same journal
Journal of Sound and Vibration
Fluid Mechanics and Acoustics

Search outside of DiVA

GoogleGoogle Scholar
Total: 58 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 249 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf