Sound power levels of road vehicles measured by the square-integrating technique
The knowledge of properties of road vehicle noise at a constant speed is the most important in predicting road traffic noise propagation. The sound power levels of road vehicles are used as a basic value in the road traffic noise prediction model proposed by the Acoustical Society of Japan. The sound power level is usually calculated on the assumption that a vehicle comes from a nondirectional point source, from the FAST peak value of the sound pressure level. This is measured at a distance of 7.5m from the vehicle path when a tested vehicle is passing by the measuring point. In this ordinary method, however, there is a question whether the sound power level is obtained accurately in physical meaning, because the noise generating mechanism of a vehicle is much more complicated. Therefore we have investigated a new measuring method for the sound power levels of vehicle noise at a constant speed by the square-integrating technique. The validity and the applicability of this method for the measurements of A-weighted sound power level of a vehicle were discussed in the previous papers. In this study, the measurement of sound power levels of road vehicles in actual traffic flow was carried out and the applicability of this measuring method for the octave band sound power level has been examined.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/0909882126
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Authors:
- Yoshihisa, K
- Tatsuda, K
- Tachibana, H
- Conference:
- Publication Date: 1991
Language
- English
Media Info
- Pagination: 353-6
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Serial:
- Volume: 1
Subject/Index Terms
- TRT Terms: Mathematical models; Measurement; Methodology; Noise; Vehicles
- ATRI Terms: Measurement; Methodology; Modelling; Noise; Vehicle
- Subject Areas: Vehicles and Equipment;
Filing Info
- Accession Number: 01432988
- Record Type: Publication
- Source Agency: ARRB
- ISBN: 0909882126
- Files: ATRI
- Created Date: Aug 24 2012 5:21PM