A 3D envelopment procedure for tyre belt radiated noise level prediction

The HyRoNE model is based on a hybrid approach that combines simplified physical models and statistical relationships built upon a database for the prediction of rolling noise levels. 2D enveloped texture profiles, intended to account for the partial tyre/road contact, are used in the current version for predicting the noise levels due to the tyre belt vibration. Smooth road surfaces in the database highlight contributions in the low and medium frequency domain not related to the enveloped road texture and suggest to also considering the tyre tread pattern for the tyre belt radiated noise level prediction. Due to the essentially different road and tyre tread roughnesses, 2D profiles are no longer suitable and therefore a 3D envelopment procedure is proposed to account for a combined road and tyre roughness. This 3D procedure is tested on a database which includes 3D texture and noise measurements performed on a set of impervious road surfaces within the DEUFRAKO ODSurf project. Noise measurements with a slick tyre and a patterned tyre are considered. The results are compared with those obtained with the 2D envelopment procedure.