Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

Analytic tyre vibration model

An analytic dynamic model of a pneumatic tyre was developed to operate from static behaviour to 3kHz, the upper frequency required for radiated noise. The model gives the tyre motion in the normal and tangential directions at any point on the tyre surface arising from a normal or tangential input force. This transfer function is expressed in terms of the average geometric and material properties of the tyre cross section.

Another low frequency model was also made to give the: contact length and normal and tangential force distribution in the contact zone. The most influential tyre parameter on the force distribution is the contact stiffness between the tread and road surface, which is largely controlled by the surface roughness. A mathematical expression for this contact stiffness was obtained as a function of static load, air pressure and the road geometry. The tyre model and contact stiffness models were confirmed experimentally. The contact model was further developed to give the dynamic friction functions for a single asperity on a rubber surface, as a function of slip speed, material properties, static load, and adhesion due to air pressure.

The main benefit of these analytic models is in research to provide physical insight to the mechanisms at work. They will also be used in future work to predict the vibration to rolling, and will be used in an investigation of tyre slip and traction.

Reported by

University of Southampton, UK
Platia Skra 13, Kalamaria
55132 Thessaloniki
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