Prediction of contact stresses for tyre-road noise modelling
Résumé
Tyre/road noise is greatly influenced by the dynamic forces generated in the contact patch. The current research for predicting the contact stresses is based on analytical formulations in two or three dimensions. The paper deals with the validation of an analytical multipoint contact pattern currently developed for introduction in a full model for tyre/road noise. The tyre tread is modelled by an elastic half-space and the road surface by several rigid asperities with random shapes. The contact law for each indenter depends on the interpenetrated volume, the area and the perimeter of its base. The model is three-dimensional and considers the interaction between the contact points. The contact between a rubber block and a periodic surface composed of spherical indenters was studied. The contact areas and stresses were measured using pressure sensitive Fuji Prescale films. The accuracy of the measurement method was estimated using the hertzian contact between a spherical indenter and the rubber block. The experimental results were compared with the multipoint model. Next work will focus on the validation of the model for real road surfaces, by evaluating the contact stresses first in statics and then in rolling conditions.
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