Micro texture characterization and prognosis of the maximum traction between grosch wheel and asphalt surfaces under wet conditions

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Micro texture characterization and prognosis of the maximum traction between grosch wheel and asphalt surfaces under wet conditions

Bouzid, Noamen / Heimann, Bodo

A reliable online prognosis of the grip available between tire and road is a feature with high potential for further improvements of the automotive safety. Under wet conditions the grip information can be derived from an online measurement of the influencing parameters, like water film thickness etc. The prognosis systems proposed heretofore are able to describe the hydrodynamic fall of traction at high speeds which depends on the vehicle speed, the water film thickness and the drainage properties of the road surface and of the tire. But, there exits a limitation concerning characterization and influence description of the road micro roughness which determines the friction level at low speeds. The present article deals with rubber friction under wet conditions and at low speeds, which is affected by the micro texture. Experimental investigations are done using the Grosch wheel and several asphalt surface samples. The parameters temperature, speed, wheel load, rubber compound and pavement roughness are considered in order to investigate possible interactions between them in respect to the friction coefficient. A micro texture descriptor with a high correlation to the wet grip at low speed is suggested.