Toward the acoustical characterization of asphalt pavements: analysis of the tire/road sound from a porous surface.
Sound level in close proximity to the contact patch of the tire and road (L(CPtr)) is analyzed as a function of the vehicle speed in the acoustic frequency range, showing different behavior depending on frequency. At least two regions are observed; one at low frequencies, where the variation in sound with speed (coefficient B) increases with frequency, and the other at higher frequencies, where such sound/speed variation does not increase significantly with frequency. The dependence of B at low frequencies seems to be correlated with the high sound absorption of this porous surface.
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Department of Applied Physics, Laboratory of Acoustics Applied to Civil Engineering, ETSI Caminos and ES Informatica, Universidad de Castilla-La Mancha, Ciudad Real, Spain. santiago.exposito@uclm.es
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