Research On Dynamic Characteristics Of Subway Shoegear And Conductor Rail System Considering Line Influence

In the field of urban rail transit,the shoegear and conductor rail system is responsible for providing continuous electric energy for the train.When the shoegear slides along the conductor rail,it will be affected by various vibration sources from the line and the subway itself.The contact vibration behavior are very complex,among which vehicle vibration is the main excitation source affecting the shoegear and conductor rail system.Previous studies about the dynamics of shoegear and conductor rail system usually ignored the influence of vehicle vibration,or only took the vertical influence of vehicle body vibration into consideration.In fact,the 6-DOF vibration of the vehicle will affect the current collection quality of the shoegear and conductor rail system.To close the research gap in this regard,this paper,under the framework of finite element technology and multi-body dynamics theory and with the following contact shoegear and conductor rail system as the research object,established the vehicle-shoegear-conductor rail coupling model and made comparations with the measured data to verify the effectiveness of the model.On this basis,it analyzed the influence laws of running speed,conductor rail irregularity,conductor rail joint gap,vehicle vibration and rail quality on the contact force of shoegear and conductor rail system.The specific work is as follows:Firstly,by using finite element technology to carry out the static strength analysis and modal analysis of shoegear and conductor rail system,the stress and deformation of shoegear and conductor rail were obtained.It was found that the shape variable of T-shaped swing arm is the largest,and the flexibility of the T-shaped swing arm has a great influence on the shoegear and conductor rail coupling vibration;The vertical shape variable of conductor rail has a direct relation with the span,but is little relative with the temperature.Secondly,considering the influence of vehicle body vibration,a metro type a vehicle model was built in SIMPACK in the paper;given the structural characteristics of T-shaped swing arm apt to deformation,the rigid-flexible coupling model of shoegear was thus established;while taking into consideration the influence of elastic deformation of steel aluminum composite conductor rail and insulating support,the finite element model of conductor rail was established in ANSYS.By adding boundary conditions to the model,an accurate vehicleshoegear-conductor rail coupling dynamic model was established,while the comparison with the measured data helped verify the effectiveness of the model.Finally,based on the vehicle-shoegear-conductor rail coupling dynamic model,the paper had a research on the effects of running speed,conductor rail irregularity,conductor rail joint gap,vehicle vibration and rail quality on the interaction of shoegear and conductor rail system.The findings revealed that with the increase of vehicle running speed,the current collection quality of shoegear and conductor rail system decreases and the influence of conductor rail irregularity on the dynamic performance of shoegear and conductor rail system increases;compared with the working condition of the front low and rear high rail joint gap,the train speed has a serious impact on the current collection quality of the shoegear and conductor rail system when the shoegear passes through the front high and rear low rail joint gap.It was also found that under high-speed working conditions,the standard deviation of shoegear and conductor rail contact force will increase due to the vehicle body vibration caused by wheelrail excitation,which will further lead to an obvious reduction of the current collection quality of the system;The influence of rail quality on shoegear and conductor rail contact force has strong randomness,and the current collection quality of shoegear and conductor rail system decreases with the increase of track irregularity.