【摘要】 为分析不同牵引/制动行车方式下的道岔区轮轨瞬态滚动接触行为,考虑轮轨宏观动力作用和局部接触信息的耦合关系,了解轮对真实运动状态和精确的瞬态接触解,探明3种不同牵引系数下车轮滚动通过道岔的轮轨接触行为,并针对轮载过渡区内的接触状态开展精确的应力/应变和磨耗分析。结论表明:牵引系数改变对轮轨纵向力影响较大,对竖向力影响较小。随着牵引系数的增加,轮轨接触光带变窄,接触斑内滑动区面积显著提升,且轮对横向位移达到最大的时刻滞后,磨耗最大值位于尖轨顶宽50 mm处。基于显式动力学方法建立的轮对-道岔有限元模型可精确考虑轮对滚动通过道岔的姿态,可为道岔区轮轨滚动接触和磨耗研究提供一定的理论基础。更多还原

【Abstract】 To analyze the wheel-rail transient rolling contact behavior in the turnout area under different traction/brake modes,the wheel-rail contact behavior of the wheel rolling through the turnout under 3 different traction coefficients is explored,and the accurate stress/strain and wear analysis is carried out for the contact state in the wheel load transition area by considering the coupling relationship between the wheel-rail macro-dynamic action and local contact information,the real motion state of the wheelset and the accurate transient contact solution.It is concluded that the change of traction coefficient has a great impact on the longitudinal force of wheel-rail and has a small impact on the vertical force.With the increase of traction coefficient,the wheel-rail contact light strip narrows,the sliding area in the contact pattern increases significantly,the maximum lateral displacement of the wheelset is reached with a lag,and the abrasion value is located at 50 mm of the top width of the switch rail.The wheelset-turnout finite element model established based on the explicit dynamic method can accurately consider the attitude of the wheelset rolling through the turnout.For the research of wheel-rail rolling contact and wear in the turnout area,it can provide a certain theoretical basis.更多还原