车辆稳态回转对轮胎热-力耦合响应的影响研究

Study on Influence of Vehicle Steady-state Cornering on Thermal-Mechanical Coupling Response of Tires

研究车辆稳态回转对轮胎热-力耦合响应的影响。结果表明:车辆操纵稳定性测试前采用稳态回转暖胎时,定回转半径、不定车身侧向加速度工况下较定车身侧向加速度、不定回转半径工况下的轮胎整体温升梯度和幅值波动大;车辆稳态回转时,轮胎温度变化对车身侧向加速度波动非常敏感,左转向车辆车身侧向加速度增大与右侧轮胎分配负荷呈正相关变化,在复合侧偏侧倾作用下,能够加剧轮胎温升;暖胎引起轮胎温度的变化改变轮胎侧偏和纵滑等力学特性响应,造成非线性滑移区滞回幅值不稳定,易导致车辆操纵稳定性测试数据的重复性变差,进而对车辆动力学仿真验证和模型调整带来困难。本研究结果可为整车测试提供指导。

The influence of vehicle steady-state cornering on the thermal-mechanical coupling response of the tires was studied.The results showed that when the tires were warmed up by means of steady-state cornering before the vehicle handling stability test,the tire temperature gradient and amplitude fluctuation under the conditions of constant cornering radius and variable lateral acceleration of the vehicle body were larger than those under the conditions of constant lateral acceleration and variable cornering radius.During the vehicle steady-state cornering,the tire temperature change was very sensitive to the lateral acceleration fluctuation of the vehicle body.When the vehicle turned left,the increase of lateral acceleration was positively correlated with the load distribution of the right tire.Under the action of sideslip combined with camber condition,the tire temperature rise could be aggravated.The tire temperature change caused by warming up altered the response of mechanical properties such as tire sideslip and longitudinal slip,causing unstable hysteresis amplitude in the nonlinear slip zone,which easily lead to poor repeatability of vehicle handling stability test result,and thus brought difficulties to vehicle dynamic simulation verification and model adjustment.The results of this study could provide guidance for vehicle tests.