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Analysis of initial decay rate in relation to estimates of loss factor and equivalent mass in experimental SEA
Luleå tekniska universitet.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0001-5435-2069
1996 (English)In: Proceedings of ISMA 21: 1996 international conference on noise and vibration engineering, Leuven: Katholieke Univ. Leuven , 1996, p. 187-198Conference paper, Published paper (Refereed)
Abstract [en]

The initial decay rate for single and coupled plates is studied in relation to the consistency of the loss factors between the energy and decay methods. It is confirmed that a shorter decay range of the first 10 dB decay, rather than two larger decay intervals from 0 to -30 dB or from -5 to -35 dB, gives a much better agreement between the methods. Mean free path time is introduced to facilitate the selection of the initial decay interval and the initial point of reverberation decay. It is found, in general, that to obtain a small spatial variation of the initial decay rate, at least four modes per band are needed. The repeatability of the associated loss factor can be made within +/-1 dB with 95 percent confidence level. In addition, the initial decay rate is applied to investigate the property of equivalent mass. It is verified experimentally that the strong coupling has a significant influence on initial decay rate and equivalent mass. It is shown that the equivalent mass has to be used for the estimation of total energy of a complex subsystem where only a limited number of measurement points can be selected and only a part of the subsystem can be accessible for the measurement. It is also explained why the equivalent mass can be larger than the actual mass for a complex subsystem.

Place, publisher, year, edition, pages
Leuven: Katholieke Univ. Leuven , 1996. p. 187-198
National Category
Fluid Mechanics and Acoustics
Research subject
Engineering Acoustics
Identifiers
URN: urn:nbn:se:ltu:diva-38345Local ID: cb4a3fc0-8235-11db-aabe-000ea68e967bOAI: oai:DiVA.org:ltu-38345DiVA, id: diva2:1011845
Conference
International conference on noise and vibration engineering : 18/09/1996 - 20/09/1996
Note
Godkänd; 1996; 20061122 (biem)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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Ågren, Anders

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CiteExportLink to record
Permanent link

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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