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| 1 | 转向架关键运动部件动力学机理与故障诊断研究综述显示文摘转向架是机车车辆的关键子系统之一,对保证列车的运行性能和服役安全具有重要的作用。随着列车运行速度的提高,轮轨之间的动态相互作用加剧,导致轮对、轴箱轴承、齿轮传动系统、牵引电机等转向架关键运动部件的运行工况十分恶劣,故障时有发生,危及行车安全。针对转向架关键运动部件的动力学行为和故障诊断,国内外学者开展了大量的研究工作。首先,从动力学模型、故障机理分析两个方面总结了转向架关键运动部件的研究现状。其次,梳理了转向架关键运动部件故障诊断中常用的信号处理和机器学习方法。最后,面向智能运维的工程需求,对当前研究存在的问题和发展趋势进行了总结和展望。 | 杨绍普 顾晓辉 刘永强 邓飞跃 刘泽潮 刘文朋 王宝森 | 2023 | 机械工程学报2023，59，20： | 0 |
| 2 | Characteristic analysis of mechanical thermal coupling model for bearing rotor system of high-speed train显示文摘Based on Newton’s second law and the thermal network method,a mechanical thermal coupling model of the bearing rotor system of high-speed trains is established to study the interaction between the bearing vibration and temperature.The influence of lubrication on the vibration and temperature characteristics of the system is considered in the model,and the real-time relationship between them is built up by using the transient temperature field model.After considering the lubrication,the bearing outer ring vibration acceleration and node temperature considering grease are lower,which shows the necessity of adding the lubrication model.The corresponding experiments for characteristics of vibration and temperature of the model are respectively conducted.In the envelope spectrum obtained from the simulation signal and the experimental signal,the frequency values corresponding to the peaks are close to the theoretical calculation results,and the error is very small.In the three stages of the temperature characteristic experiment,the node temperature change of the simulation model is consistent with the experiment.The good agreement between simulation and experiments proves the effectiveness of the model.By studying the influence of the bearing angular and fault size on the system node temperature,as well as the change law of bearing lubrication characteristics and temperature,it is found that the worse the working condition is,the higher the temperature is.When the ambient temperature is low,the viscosity of grease increases,and the oil film becomes thicker,which increases the sliding probability of the rolling element,thus affecting the normal operation of the bearing,which explains the phenomenon of frequent bearing faults of high-speed trains in the low-temperature area of Northeast China.Further analysis shows that faults often occur in the early stage of train operation in the low-temperature environment. | Yongqiang LIU Baosen WANG Shaopu YANG Yingying LIAO Tao GUO | 2022 | Applied Mathematics and Mechanics(English Edition)2022，43，9： | 0 |
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