轮胎参数对前轮摆振的影响

在经典三自由度前轮摆振模型的基础上,利用非线性动力学理论分析了车速变化引起的某非独立悬架汽车前轮自激摆振的Hopf分岔。利用Poincare截面法绘制了不同轮胎参数对应的前轮摆角幅值随车速变化的分岔特性曲线,分析了轮胎各参数对前轮摆振的影响。由此得出,轮胎参数的改变对发生摆振的车速区间和周期运动的极限环幅值产生相应的影响;轮胎绕主销的阻尼和轮胎后倾拖距对前轮摆振的影响较为敏感;轮胎的垂直刚度对摆振影响要比侧偏刚度的影响大。

Influence of Tire Parameters on Front Wheel Shimmy

The Hopf bifurcation characteristics caused by the velocity of some vehicle with dependent suspension were analyzed on the basis of three degree of freedom front wheel self-excited shimmy with the nonlinear dynamics.Various parameters bifurcation characteristic curves of front wheel shimmy amplitudes were plotted with the method of Poincare mapping when the velocity changed. And the influences of different tire parameters on the front wheel shimmy were analyzed.The result shows that the velocity interval and the limit cycle amplitudes of shimmy system change with the different tire parameters.And the tire damping around kingpin and the caster trail are more sensitive to the shimmy system than other parameters.The tire vertical stiffness has a greater influence on the shimmy system than the cornering stiffness.