The prediction of tyre/road noise has been one of the most challenging research fields within acoustics for the last twenty years. In particular, it has been difficult to achieve an accurate description of the road and rolling tyre contact. Mainly because the contact is non-linear, due to the time-varying size of the contact patch between the tyre and the road. Moreover it is at the contact patch that air pumping, tyre excitation by dynamic contact forces and indenting of roughness peaks in the tyre tread take place. An accurate model of the contact is however crucial for the prediction of tyre/road noise. A three-dimensional contact model for the tyre/road interaction in rolling conditions is described and validated. The contact model is formulated in the time domain for non-linearity reasons. The model calculates the dynamic radial contact forces during rolling, the local deformation at the contact patch due to roughness indenting, and the normal forced vibrations of the tyre structure. The contact problem is solved by classical contact mechanics using an elastic half-space. The tyre response is described by Green's functions calculated using a tyre model, a pre-tensioned orthotropic plate on a stiffness bedding. The road is assumed rigid and its roughness is obtained by laser measurements. In order to validate the model, acceleration and noise were measured for several tyre/road/speed configurations using a test drum. Measured and calculated acceleration signals from the tyre structure were then compared. Results show that the agreement was good for the studied case.
A three-dimensional rolling contact model for the description of the tyre/road interaction
2003
8 Seiten, 5 Quellen
Aufsatz (Konferenz)
Englisch
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