CRH_2-300型动车组车轮型面的多目标优化研究

Multiobjective Optimization for CRH_2-300 EMU Wheel Profile

采用ADAMS/Rail软件建立CRH2-300型动车组的动力学仿真模型,并采用京津城际铁路CRH2-300型动车组300km·h-1速度下的实测数据验证仿真模型的准确性;选择武广客运专线所占比例较大的前3位线路线型(直线线路及9 000和10 000m半径曲线线路)的实际参数建立2个线路模型;选择轮轨磨耗指数、临界速度和横向乘坐舒适性作为CRH2-300型动车组车轮型面优化的目标函数,以横向和垂向乘坐舒适性指标、一位轮对脱轨系数、轮轨最大接触应力、轮轨横向力、车轮表面疲劳因子和动车组临界速度应满足的工程应用条件为约束条件,建立CRH2-300型动车组车轮型面多目标优化设计的数学模型。结果表明:装配优化的型面车轮可使CRH2-300型动车组的临界速度较装配LMA型面车轮时提高23%,且轮轨磨耗指数降低18%。

The dynamics simulation model of CRH2-300 EMU was built by ADAMS/Rail software, and its correctness was validated by the field test data of CRH2-300 EMU running on Beijing-Tianjin intercity railway at the speed of 300 km h-1. Two track models were built using the actual parameters of three line types, namely, straight line, 9 000 and 10 000 m radius curve lines, which took the first three largest proportions of Wuhan-Guangzhou passenger dedicated line. The indexes of wheel/rail wear, critical speed and lateral riding comfort were chosen as the objective functions of wheel profile optimization for CRH2-300 EMU. With the lateral and vertical riding comfort indexes, the derailment coefficient of the leading wheelset, the maximum wheel rail contact stress, wheel rail lateral force, wheel fatigue factor, the critical speed of CRHz-300 EMU satisfying the requirements for engineering application as constraints, the mathematical model for the multiobjective optimization of CRH2-300 EMU wheel profile was constructed. The results show that the critical speed of CRH2-300 EMU with the optimized wheel profile has been improved 23 % and the wheel-rail wear index has been reduced 18% compared to that with LMA wheel profile.