Some Recent Investigations into Dynamics and Frictional Behavior of Pneumatic Tires
A concise review of dynamic tire response to both in-plane and out-of-plane wheel motions is followed by discussions on special subjects. First, the possible self-excited in-plane motion of a wheel of which the axle is suspended with respect to the steady-moving car body is discussed. The influence of several parameters such as the rate of change of effective rolling radius with tire deflection, suspension angle, and tire torsional and slip stiffness is indicated. Second, the influence of tire inertia upon out-of-plane tire performance is elucidated on the basis of theoretical results. The experimentally observed considerable reduction of the first natural frequency of the out-of-plane motion of the tire about a diameter, due to wheel rotational speed, is analyzed. The last portion deals with a theoretical explanation of the creation of a loop in the quasi steady-state cornering force characteristic which appeared to occur on wet slippery roads with tires exhibiting certain wear patterns.
KeywordsTorque Radial Tire Asphalt
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