Abstract：Considering the nonlinear characteristic of tire’s grounding friction and using the calculation formula of lateral stiffness obtained by energy method, a dynamic model of the polygonal wear of tire was established based on the lateral vibration of tire tread. Utilizing this model, the generation mechanism of polygonal wear was discussed, and the effects of speed, toe-in angle and vertical load for tire wear were analyzed through numerical simulation. The results show that: the polygonal wear is the circumferential uneven wear which is the overlay of even wear and disturbance wear caused by the tread’s lateral self-excited vibration, which is a typical nonlinear self-excitation vibration phenomenon; based on Lyapunov stability theory, the self-excited vibration of tire is proved to be a kind of stable periodic vibration caused by Hopf bifurcation of system; high speed, large toe-in angle and overload are the possible reasons which lead to polygonal wear of tire.
2011, Vol. 30 
