摘要
在轮轨滚动接触模拟试验机上采用均匀连续变化差的试验方法,进行不同工况和不同法向力条件下的轮轨黏着-蠕滑曲线试验,并利用两种数值拟合方法研究不同试验条件下的黏着-蠕滑曲线峰值点位置和初始斜率。结果表明:不同工况下的轮轨黏着-蠕滑曲线有较大差异,与干态相比,水、油工况下不仅导致黏着系数明显降低,还会导致峰值点发生明显左移;水、油工况下撒砂可有效提高黏着系数并使峰值点位置右移;干态下法向力增加对黏着系数和峰值点位置影响较小,但会导致曲线初始阶段斜率的下降;水、油工况下法向力的增加均会使黏着峰值点位置左移,并在水态下导致黏着系数的明显下降;撒砂后法向力对黏着系数及峰值点位置的影响较小,但曲线初始阶段斜率随法向力的增加呈下降趋势。通过试验和数值拟合获得轮轨黏着-蠕滑曲线特征参数的方法可为后续轮轨黏着研究提供参考。
The wheel/rail adhesion-creep curves under different surface conditions and normal forces are measured on a wheel/rail rolling contact apparatus through a continuous varying creep ratio test method.The peak positions and initial slopes of the measured adhesion-creep curves in different tests are investigated through two numerical fitting strategies.The results indicate that there are big differences of the adhesion-creep curves under different conditions.Compared to the dry condition,water and oil conditions not only drop the adhesion coefficient obviously but also move the peak points to the left of the curves.Sanding under water or oil condition could efficiently improve the degraded adhesion coefficient and lead the right movement of the peaks in the curves.Under dry condition,the increase of normal force affects little on the adhesion coefficient and peak position,but could descend the initial slopes of the adhesion-creep curves.Under water and oil conditions,the increase of normal force leads the left movement of the peaks in the curves.In addition,significant decrease of adhesion coefficient could also be observed with the increased normal forces under water condition.After sanding,both the adhesion coefficient and the peak position are less affect by the increased normal force,while the initial slopes of the adhesion-creep curves are reduced obviously.The combination of this experiment and numerical strategies to achieve the character parameters of the adhesion-creep curves could make good references for future studies.
作者
师陆冰
李群
郭俊
王文健
刘启跃
SHI Lubing;LI Qun;GUO Jun;WANG Wenjian;LIU Qiyue(State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031)
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2019年第10期151-157,共7页
Journal of Mechanical Engineering
基金
国家自然科学基金(51775455)
四川省重点研发计划(2018GZ0368)
西南交通大学优秀博士论文培育资助项目
关键词
轮轨黏着
黏着-蠕滑曲线
表面工况
法向力
wheel/rail adhesion
adhesion-creep curve
surface conditions
normal force
