Prediction of Coast-By tyre/road noise levels at peri-urban and urban speeds
Abstract
The paper deals with the prediction from texture related quantities of Coast-By (CB) tyre/road noise levels emitted by a passenger car at peri-urban and urban speeds, using a hybrid model that mixes simplified physical models and statistical relationships. One-third octave band noise levels are predicted from one-third octave band roughness levels. A 3D ?enveloped? roughness that combines road texture and tyre tread pattern is used to evaluate the noise levels in the low and medium frequency range. The road texture at small wavelengths is used to predict the noise levels in the high frequency range. The model is built at several
reference speeds by adjusting the statistical relationships coefficients between noise and roughness levels upon a database of 12 impervious road surfaces with quasismooth to coarse textures. The predicted one-third octave band and overall CB noise levels are compared to the measured noise levels. The results are discussed, in particular with regard to the reference speed considered.
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