Compilation of some novel approaches for rolling noise evaluation in vehicles

Abstract

Traditional standardized methodologies for tyre/road noise evaluation are commonly based on sound pressure level measurements (SPL). The Coast-By method (CB) stablishes the measurement point at 7.5m away from the test vehicle path; the Close-Proximity (CPX) is focused on measurements in the close field of the tyre-pavement interaction region; and the Drum method (DR), which is not currently a standardized procedure but is widely used for research purposes, is usually applied for measuring in similar positions to the CPX ones. These methodologies provide their results as an expression of the SPL, but this is not an inherent magnitude to the sound source and hence it may be affected by environment, attenuation or distance. Aimed at assessing the tyre/road noise emission by means of an inherent magnitude, the LIAV-UMH group has focused on designing new measurement procedures that can be used as an alternative to the previous ones. This paper presents these novel approaches, which are partly based on the traditional CB, CPX and DR methods, and also on the ISO 3744 standard, but their novelty lies in providing the sound power level (SWL) emitted by the rolling tyre.