不同车轮型面对地铁道岔区轮轨静态接触行为的影响

Influence of different wheel tread on static wheel-rail contact behavior in subway turnout area

为了研究不同车轮型面对地铁9号道岔转辙器区的轮轨静态接触行为的影响,基于经典迹线法求解轮轨接触几何关系,利用三维非赫兹滚动接触理论分析接触力学特性,分析接触点对分布、道岔转辙器结构不平顺、轮轨接触几何参数和轮轨接触斑的形状、面积及最大法向接触应力等。数值计算中,考虑轮背距为1353 mm的LM和DIN5573以及轮背距为1358 mm的S1002这3种车轮型面,从静力学分析的角度提出地铁道岔区的最优车轮型面。研究结果表明:DIN5573车轮过岔接触点对分布较集中,结构不平顺幅值较小,直向过岔时轮对的稳定性较好但接触力学特性较差;S1002车轮侧向过岔通过能力较强,接触力学特性良好,但轮对向尖基轨侧横移时较易发生轮缘接触,轮轨表面易产生疲劳伤损;LM车轮综合匹配性能最好。

In order to study the influence of different wheel tread on the static wheel-rail contact behavior in the switch area of No.9 turnout in the subway,the contact geometry relationship between wheel and rail was solved based on the classic track line method,and the contact mechanical characteristics were analyzed by using the 3D non-Hertz rolling contact theory.The content of the analysis included the contact point of distribution,the structural irregularity in the turnout switch,wheel-rail contact geometry parameters and the shape of the wheel-rail contact patch,contact area and maximum normal stress,etc.In the simulation,different wheel profiles,such as LM and DIN5573 whose wheel back distances are 1353 mm and S1002 whose wheel back distance is 1358 mm,were considered.The optimum wheel tread in subway turnout area were proposed from the point of statics analysis.The results show that when DIN5573 wheel passes through the turnout,the distribution of its contact point pairs is more concentrated and the amplitude of the irregularity in the turnout switch is smaller.When it passes through the turnout in the straight route,the wheelset has good stability but poor contact mechanical properties.The S1002 wheel has a stronger passing capacity through the turnout in the lateral direction and good contact mechanical properties.However,when the wheelset moves to the switch rail and the stock rail side in the transverse direction,the flange contact is more likely to occur,and the wheel-rail surface is prone to fatigue damage.The LM wheel has the best overall matching performance.