title: Monitoring road surfaces by close proximity noise of the tire/road interaction.
abstract: Applied acoustics is becoming an important field for civil infrastructure and environmental assessment, and road maintenance or rehabilitation strategies. In this research LA(2)IC 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 10 m 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 102 dB(A), with a variability of approximately 0.6 dB(A), are found at a reference vehicle speed of 85 kmh. The frequency spectrum analysis over the test section shows noticeable differences for frequencies above 1 kHz, where the tire/road noise generation mechanisms are dominated by air pumping.
authors.affiliation: Laboratory of Acoustics Applied to Civil Engineering (LA2IC), Department of Applied Physics, E.T.S.I. Caminos and E.S. Informática, Universidad de Castilla-La Mancha (UCLM), 13071 Ciudad Real, Spain. santiago.exposito@uclm.es
authors.forename: S E
authors.initials: SE
authors.lastname: Paje
authors.forename: M
authors.initials: M
authors.lastname: Bueno
authors.forename: F
authors.initials: F
authors.lastname: Terán
authors.forename: U
authors.initials: U
authors.lastname: Viñuela