Traction Power State Key Laboratory, Southwest Jiaotong University, Chengdu 610031, China.
School of Mechatronics and Vehicle Enginneering, East China Jiaotong University, Nanchang 330013, China.
Sensors (Basel). 2023 Jun 21;23(13):5803. doi: 10.3390/s23135803.
The wheelset coaxial wheel diameter difference is one of the most common wheel faults of railway vehicles. The existence of the wheelset coaxial wheel diameter difference may lead to the off-load operation of vehicles, resulting in abnormal wheel tread wear, leading to the deterioration of the wheel-rail contact relationship, resulting in the deterioration of the vehicle's operating stability and comfort, and even leading to an increase in the derailment coefficient, affecting the running safety. In order to monitor the freight car wheelset coaxial wheel diameter difference online, a vehicle-track coupling dynamics model based on a trackside detection method was established, and the response of rail lateral displacement under the condition of the wheelset coaxial wheel diameter difference was analyzed. The results show that the existence of the wheelset coaxial wheel diameter difference can lead to a deviation in the vehicle's run, with an increase in the wheelset coaxial wheel diameter difference and an increase in the lateral offset of wheelset increases. The impact of vehicle unbalance loading on the lateral movement of the wheelset is much smaller than that of the wheelset coaxial wheel diameter difference. The existence of the wheelset coaxial wheel diameter difference can be better reflected by detecting the wheelset's lateral displacement. On straight line, the variation of lateral displacement has no infection of vehicle speed, but shows a quadratic growth trend with the wheelset coaxial wheel diameter difference. Based on this, the mapping relationship between the wheelset coaxial wheel diameter difference and wheelset lateral displacement can be obtained. Through a mapping relationship, the size of the wheelset coaxial wheel diameter difference can be reversed precisely through the detection of a trackside lateral movement monitoring system. The reliability of the identification method was verified with a specific test on the trackside monitoring system.
轮对同轮直径差是铁路车辆最常见的车轮故障之一。轮对同轮直径差的存在可能导致车辆卸载运行，导致车轮异常踏面磨损，从而恶化轮轨接触关系，导致车辆运行稳定性和舒适性恶化，甚至导致脱轨系数增加，影响运行安全。为了在线监测货车轮对同轮直径差，建立了基于轨道检测方法的车辆-轨道耦合动力学模型，分析了轮对同轮直径差条件下轨道横向位移的响应。结果表明，轮对同轮直径差的存在会导致车辆运行偏离，轮对同轮直径差越大，轮对横向偏移越大。车辆不平衡载荷对轮对横向运动的影响远小于轮对同轮直径差。通过检测轮对的横向位移可以更好地反映轮对同轮直径差的存在。在线路上，横向位移的变化不受车速的影响，但随着轮对同轮直径差的增大呈现二次增长趋势。基于此，可以得到轮对同轮直径差与轮对横向位移的映射关系。通过映射关系，可以通过轨道横向运动监测系统的检测精确地反转轮对同轮直径差的大小。通过轨道监测系统的具体测试验证了识别方法的可靠性。
