【摘要】 国内某线路高速列车因二系横向减振器故障在普通线路上产生小幅蛇行运动，并在过岔时演变为蛇行失稳。基于该线路列车参数建立SIMPACK动力学仿真模型与可动心轨道岔截面模型，分析减振器故障车辆过岔后的小幅蛇行极限环的演变趋势。首先计算普通轨道、转辙区、辙叉区、完整道岔4种激扰的分别作用下，故障车辆产生稳定极限环的临界速度。随后计算车辆在入岔前不同轮对蛇行横移量幅值对车辆临界速度的影响。最后通过相轨迹图分析上述因素对故障车辆的轮对蛇行不稳定极限环的演变的影响。研究结果表明，直向通过可动心轨道岔时的激扰增加的蛇行能量会使车辆产生极限环的速度降低，不稳定极限环演变得更快。车辆进入岔区前蛇行幅值增加，失稳临界速度降低，会进一步加快不稳定极限环的演变。因此在监测车辆进岔时需要对轮对小幅蛇行幅值进行分析，合理降速以防蛇行失稳的演变。更多还原

【Abstract】 It is because of the damage on lateral damper of secondary suspension, the small hunting occurred on an actual high-speed train in China on ordinary track evolved into hunting instability by passing turnout. A vehicle dynamic simulation model by SIMPACK and a moveable point rail turnout by rail profiles is established, in order to analyze the evolution of the limit cycle of the small hunting of the vehicle with damper fault. First, the critical speeds at which the faulty vehicle generates stable limit cycle is calculated under four different excitation of ordinary track, switch area, frog area and whole turnout area. Then calculated the critical speeds of the vehicle which enters the turnout in different initial wheelset lateral displacements of hunting.Finally, the influence of those factors above on evolution of the unstable limit cycle of wheelset hunting is analyzed by phase trajectory diagram. The research results show that the critical speed at which the stable limit cycle generated is reduced and the evolve speed of unstable limit cycle is increased by the hunting energy which increased by turnout excitation. By increase the initial displacement of hunting of vehicle when enters the turnout, the critical speed will decrease, and the unstable limit cycle will evolve faster. So, the amplitude of wheelset small hunting should be considered when monitor the vehicle entering the turnout, in order to pretend the evolution of hunting instability by inducing the vehicle speed.更多还原