Influence of cornering stiffness of straddle-type monorail running wheel on tire wear under curve negotiating
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摘要: 基于车辆轮胎磨损理论, 研究了走行轮侧偏刚度对走行轮侧偏力和导向轮、稳定轮径向力的影响, 分析了单轨车辆曲线运行时, 走行轮摩擦功随轮胎侧偏刚度的变化趋势。分析结果表明: 受导向轮、稳定轮径向力影响, 随着走行轮侧偏刚度增加, 走行轮侧偏力逐渐增大; 当走行轮侧偏刚度处于1120kN·rad-1范围时, 走行轮侧偏力与侧偏角处于线性范围, 侧偏角呈现微量变化; 当侧偏刚度超过120kN·rad-1时, 侧偏角迅速增大, 进入非线性区域。基于轮胎磨损指标, 随着走行轮侧偏刚度增加, 走行轮磨损量以1.2%的速率增加。走行轮侧偏刚度还将影响车辆曲线通过性, 过小的侧偏刚度不利于形成摇头力矩, 通过性能变差。在保证车辆良好通过性前提下, 尽量减小走行轮磨损, 其侧偏刚度设计值推荐为9.37kN·rad-1。Abstract: Based on vehicle tire wear theory, the influences of cornering stiffness of running wheel on the cornering force of running wheel and the radial forces of guide wheel and stabilizing wheel for monorail vehicle were analyzed.When monorail vehicle ran along curve track, the changing trend of running wheel's friction power consumed with cornering stiffness variation was studied. Analysis result shows that affected by the radial forces of guide wheels and stabilizing wheels, the cornering force of running wheel increases as its cornering stiffness increasing. When the cornering stiffness range of running wheel is from 1 kN·rad-1 to 120 kN·rad-1, its cornering force and side slip angle are linear, and side slip angle has minor change.When the cornering stiffness exceeds 120 kN·rad-1, side slip angle increases rapidly into the nonlinear region.Based on tire wear index, with the cornering stiffness increase of running wheel, its tire wear increases at 1.2% rate as curve traveling.The cornering stiffness also affect the curve negotiating performance of monorail vehicle, much small cornering stiffness is not conducive to form shook head torque and the curve performance is bad.In order to reduce tire wear, the recommendeddesign cornering stiffness of running wheel is 9.37 kN·rad-1 under the condition of good curve negotiating performance.
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图 5 走行轮、导向轮、稳定轮与侧部轨面接触
Figure 5. Running wheels, steering wheels and stabilizing wheels in contact with side surface of track beam
图 8 前转向架前右导向轮径向力曲线
Figure 8. Radial force curves of front-right steering wheel of front bogie
图 9 前转向架左、右稳定轮径向力曲线
Figure 9. Radial force curves of left and right stabilizing wheels of front bogie
图 10 前转向架前左、后右走行轮侧偏力曲线
Figure 10. Cornering force curves of front-left and rear-right running wheels of front bogie
图 12 前、后转向架左侧稳定轮径向力曲线
Figure 12. Radial force curves of left stabilizing wheels of front and rear bogies
图 13 走行轮侧偏力与侧偏刚度关系曲线
Figure 13. Relationship curves of cornering forces and cornering stiffnesses of running wheels
图 14 走行轮侧滑角与侧偏刚度关系曲线
Figure 14. Relationship curves of side slip angles and cornering stiffnesses of running wheels
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