钢轨廓形优化对转辙器动力特性的影响研究

为提高列车高速直向过岔平稳性,将60N钢轨廓形及新设计的尖轨廓形应用于18号高速道岔转辙器部分,应用车辆-道岔耦合动力学理论,建立模型进行动力学仿真计算,与CHN60高速道岔转辙器动力特性进行对比。仿真计算结果表明:60N高速道岔转辙器部分轮载过渡段起点前移,轮载过渡时间增长;车辆直向经过道岔转辙器时的滚动圆半径差、轮对横移量和钢轨横向接触点外移幅值均减小,轮对蛇形运动幅度减小,行车平稳性得到提高;轮轨最大横向力由6.12 kN降低至4.75 kN,轮轨横向相互作用力减弱;车轮脱轨系数、车体横向加速度略有减小,轮轨垂向力、车轮减载率和车体垂向加速度变化不大,均在安全范围内。

Research on Impact of Rail Profile Optimization on Dynamic Characteristics of Switch

In order to improve the stability of high-speed train through turnout main,the 60 N rail profile and the new design of tongue rail profile are applied to the No.18 high-speed rail switch.A model is established based on the theory of train-turnout dynamics to conduct dynamics simulation calculation and its dynamics characteristics are compared with those of CHN 60 high speed rail switch.The results show that the starting point of wheel load transfer of the 60 N high speed switch is moved forward and the wheel load transfer time is increased;both the rolling radius difference,wheelset lateral displacement and the shift amplitude of rail lateral contact point decrease when the vehicle runs through turnout main;once the amplitude of wheel hunting motion is decreased,the driving stability is improved;when the maximum lateral wheel-rail force is decreased from 6.12 kN to 4.75 kN,the lateral wheel-rail interaction force is weakened;while the wheel derailment coefficient and the lateral acceleration of vehicle body decrease slightly,the vertical wheel-rail force and the load shedding rate of wheel and the vertical acceleration of vehicle body are subject to a little change and all fall in the safety range.