Validity of intensity techniques for the measurement of sound radiation factor
Publiceringsår
1991
Upphovspersoner
Uosukainen, Seppo
Abstrakt
The total radiation factor may be strongly dependent on the environment, other sources and the way of excitation. So, the measured radiation factor of a source cannot be applied directly to other circumstances. The validity of the measurements is best with the surface intensity technique and the valid frequency band is largest with the configuration having the microphone over the accelerometer. Whatever the method is, the maximum allowed critical frequencies are very low (about 1 kHz or less). So, the measurement of the radiation factor using these methods cannot be applied to machines and equipment in factories. The measurement can be suitable in some well-defined sector, e.g. in building acoustics, but in that sector the need of having an "in situ" measurement method is questionable. The errors in the measurement of radiation factor using intensity techniques have been examined in this paper only for large radiating plates and small sound sources. However, many sound sources in industry can be thought to be formed of large plates. More complicated structures may yield to stricter demands. If an "in situ" measurement of the radiation factor using intensity techniques is wanted, more work will be needed to chart the measurement uncertainties in different circumstances, in order to get the methods reliable. With the present knowledge, the methods are not suitable to be standardised for a general "in situ" method. The vibration measurement with a laser vibration meter or exploiting the acoustic holography may solve some problems.
Visa merOrganisationer och upphovspersoner
Teknologiska forskningscentralen VTT Ab
Uosukainen Seppo
Publikationstyp
Publikationsform
Separat verk
Målgrupp
Facklig
UKM:s publikationstyp
D4 Publicerad utvecklings- eller forskningsrapport eller -utredning
Publikationskanalens uppgifter
Journal
Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
Förläggare
VTT Technical Research Centre of Finland
Nummer
739
ISSN
ISBN
Öppen tillgång
Öppen tillgänglighet i förläggarens tjänst
Nej
Licens för förläggarens version
Annan licens
Parallellsparad
Nej
Övriga uppgifter
Nyckelord
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Språk
engelska
Internationell sampublikation
Nej
Sampublikation med ett företag
Nej
Publikationen ingår i undervisnings- och kulturministeriets datainsamling
Nej