扭杆梁式悬架系统的轮胎多边形磨损机理

Polygonal Wear of Automotive Tire with Twist-Beam Suspension

建立轮胎-悬架-车身系统的考虑时间延迟的轮胎多边形磨损动力学模型，探讨基于自激励振动理论的轮胎多边形磨损现象．研究表明，轮胎多边形磨损是一种典型的非线性自激励振动，不同车型、不同轮胎磨损状况下，系统的自激励振动频率不同，常见频率区间为100～400Hz；轮胎周向多边形磨损现象即由于自激励振动出现在特定的车速区间；轮胎多边形磨损的边数等于自激励振动系统的固有频率与车轮转动频率之比；轮胎在特定频段的固有频率对自激励系统振动有很大影响，扭杆梁悬架系统的垂向振动特性对轮胎多边形磨损影响很小．

A tire-suspension-body mathematical model is established based on the twist-beam suspension with time delay being considered. Polygonal wear of tire based on self-excitation theory is discussed. The results show that the polygonal wear is a typical nonlinear self-excited vibration and the frequency range of self-excited vibration fluctuates according to vehicle types and the status of tire worn. The common range of the frequency is from 100 Hz to 400 Hz; polygonal wear of tire （self-excited vibration） occurs when the velocity of a car reaches a given range;the polygonal number of the polygonal wear of tire is equivalent to the ratio of the natural frequency of the system of the self-excited vibration to the rotational frequency of tire; within the given range, the natural frequencies of tire have a great effect on the system of the self-excited vibration; the twist-beam suspension has little effect on tire polygonal wear.