【作者】 李睿；

【导师】 柳拥军；

【作者基本信息】 北京交通大学 ， 载运工具运用工程， 2019， 硕士

【摘要】 第三轨受流系统作为城市轨道交通系统的重要组成部分,其摩擦副良好的摩擦状态是车辆安全稳定运行的前提。车辆运行时,受流滑板与带电第三轨组成干摩擦副,依靠滑动摩擦实现取流。在诸多因素影响下,接触面摩擦接触状态不断改变,引起受流滑板产生摩擦振动,导致接触应力瞬时增加,加剧滑板磨损,严重影响车辆受流稳定性。因此,研究受流器/第三轨系统摩擦振动特性以及滑板运行中的摩擦行为和磨耗量,在降低城轨车辆运行成本,提高运行品质上具有重要意义。本文以城轨车辆受流器/第三轨受流系统为研究对象,以摩擦学试验为基础,针对其摩擦副摩擦振动特性和受流滑板磨耗量展开研究。具体工作如下:(1)滑板/第三轨接触面摩擦行为试验研究。根据受流器系统运动状态,选取了适用于滑板/第三轨摩擦接触行为的Stribeck摩擦模型和LuGre摩擦模型。依托受流滑板表面形貌测量试验,分析了滑板在其寿命周期内表面形貌变化趋势及原因;依托摩擦副接触面摩擦系数测定试验,分析了载荷和相对速度对接触面摩擦系数的影响,验证了接触面摩擦力的负斜率特性,并基于试验数据对摩擦模型进行了参数辨识。(2)受流器系统摩擦振动特性仿真分析。应用摩擦动力学理论,建立了系统纵向摩擦振动动力学模型,使用选取的摩擦模型分析了不同系统参数和不同形式接触压力下的系统纵向摩擦振动特性,提出摩擦振动抑制措施。并在此基础上建立了纵向与横向耦合摩擦振动动力学模型,分析了单一系统参数对各个方向摩擦振动的影响规律及影响程度,依据研究结论,提出了一种系统参数改进方案作为参考。(3)受流滑板磨耗量预测。基于摩擦功原理,针对受流滑板磨耗问题建立了滑板磨耗量预测模型,根据模型应用情况,应用MATLAB/GUI研制了预测软件并进行案例分析,通过预测值与真实值对比可知,该磨耗量预测模型达到了预期效果,预测结果良好。本文共有图182幅,表84个,参考文献84篇。更多还原

【Abstract】 As an important part of urban rail transit system,the third rail current collecting system should have good friction condition,which is the precondition for safe and stable operation of vehicles.When the vehicle is running,the collector slider and the third-rail form a dry friction pair,which realizes the current-collecting by sliding friction.Under the influence of many factors,the friction contact state of the contact surface changes constantly,which causes the friction vibration of the collector slider,makes the instantaneous increase of contact stress,aggravates the wear of the slider,and seriously affects the current receiving stability of the vehicle.Therefore,it is important to explore the friction vibration characteristics of the current collector/third-rail system and the frictional behavior and wear volume of the slider in operation,which is of great significance to reduce the operation cost of urban rail vehicles and improve the running quality.In this paper,the current collector/third-rail system of urban rail vehicles is taken as the research object,based on the tribological test,the friction vibration characteristics of the friction pairs and the wear volume of the collector slider are studied.The specific work is as follows:(1)Experimental study on friction behavior of slider/third-rail contact surface.Stribeck friction model and LuGre friction model are selected according to the motion state of the current collector system.Based on the surface topography measurement test of the collector slider,the changing trend and reasons of the surface topography of the slider in its life cycle were analyzed.Based on the test of measuring the friction coefficient of the contact surface of friction pairs,the influence of load and relative velocity on the friction coefficient of the contact surface is analyzed,and the negative slope characteristic of the friction force of the contact surface is verified.The parameters of the friction models are identified based on the test data.(2)Simulation and analysis of friction vibration characteristics of current collector system.The dynamic model of the longitudinal friction vibration of the system is established by applying the theory of friction dynamics.After that,the characteristics of the longitudinal friction vibration under different system parameters and different contact pressures are analyzed by using the selected friction model,and the measures to restrain the friction vibration are put forward.On this basis,the dynamics model of longitudinal and lateral coupled friction vibration is established.And the influence rule and degree of single system parameter on friction vibration in different directions are analyzed.(3)Prediction of collector slider’s wear volume.Based on the friction work principle,a prediction model of slider’s wear volume established for the wear problem of collector slider.According to the application of the model,prediction softwares are developed with MATLAB/GUI,and the case studies are carried out.By comparing the predicted value with the real value,the predicted model achieves the expected effect and the predicted result is accurate.In this paper,there are 182 figures,84 tables,84 references.更多还原