Monitoring road surfaces by close proximity noise of the tire/road interaction
- 1 November 2007
- journal article
- Published by Acoustical Society of America (ASA) in The Journal of the Acoustical Society of America
- Vol. 122 (5), 2636-2641
- https://doi.org/10.1121/1.2766777
Abstract
Applied acoustics is becoming an important field for civil infrastructure and environmental assessment, and road maintenance or rehabilitation strategies. In this research LA2IC has developed a GPS-based measurement techniques and apparatus on a test vehicle, for monitoring the acoustical properties of different road pavement surfaces with a reference tire. A field test on PA-12 Spanish porous pavement found in Ciudad Real is developed. The test procedure, a modification based upon the close-proximity method (CPX), relies on the use of three standard microphones situated very close to the tire/road contact patch. This procedure allows the simultaneous measurement of the sound emission synchronized to a GPS receiver, which permits tracking of the position of the sound emission. Geo-referenced sound spectra for every 10m during individual passes of the test vehicle are analyzed to determine the tire/road noise emissions from tire/PA-12 pavement interaction. Noise levels of around 102dB(A), with a variability of approximately 0.6dB(A), are found at a reference vehicle speed of 85km∕h. The frequency spectrum analysis over the test section shows noticeable differences for frequencies above 1kHz, where the tire/road noise generation mechanisms are dominated by air pumping.Keywords
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