Dynamic Response of Tires

Abstract

Abstract Tire tests were performed under time-varying inputs on the Calspan Tire Research Facility with a G78-14 belted tire at low speeds and path frequencies up to 6 rad/ft (20 rad/m). Both slip angle and vertical load were varied, either separately and periodically or in combination. The combination simulated actual time histories of slip angle and load measured in road accident avoidance tests. For path frequencies up to 0.2 rad/ft (0.7 rad/m), attenuation of lateral force and aligning torque amplitudes was negligibly small. However, both lagged static values substantially, leading to dynamic offsets in these quantities. The offsets appeared to be the most significant factors for tires. Their effect on the dynamic response of a vehicle remains to be investigated.