Vehicle Body Vibration Of Medium-low Speed Maglev Train And Its Influence On The Dynamic Performance Of Collector Shoe-conductor Rail

Along with the rapid development of China’s economy,urban rail transit is playing an irreplaceable role in people’s daily life.Maglev train is a new type of urban rail transit which has the advantages of low noise,good environmental performance and ride comfort,it has a vast prospect.Maglev train extracts electric power from the conductor rail,its collector shoe-conductor rail system vibrates during operation whose dynamic performance will directly affect the vehicle running status.Therefore,it is very important to ensure the quality of current collection of collector shoe-conductor rail system during vehicle running.The dynamic performance of collector shoe-conductor rail system is affected by many factors and there is a lack of research on the influencing factors of vehicle body vibration in present studies.This article carries out a research on the factor of vehicle body vibration.The research about the influence of vehicle body vibration on the dynamic performance of collector shoe-conductor rail system should be carried out with the help of computer simulation.This paper uses ANSYS software to simulate the rigid-flexible coupling model of collector shoe and conductor rail,and verifies the accuracy of the simulation model combining with the on-site test data.A new collector shoe-conductor rail model of the maglev line in central China is established based on this method,and its natural frequency is obtained through modal analysis.In this paper,the vehicle body vibration acceleration data of the maglev train is obtained through field tests,and its statistical characteristics are analyzed;the effect of vehicle body vibration on the performance of collector shoe-conductor rail is equivalent to the effect of displacement in the coupling direction of collector shoe-conductor rail vibration,and the vehicle body vibration acceleration is converted into displacement whose statistical characteristics are analyzed;the displacement is imported into the collector shoe-conductor rail simulation model,and the experimental data of the simulation model before and after the vehicle body vibration are compared to study the influence of the vehicle body vibration on the dynamic performance of collector shoe-conductor rail.Through the research,this article has drawn the conclusions: the first-order natural frequencies of the simulation models of the collector shoe and the conductor rail are 6.91 Hz and 9.57 Hz,respectively.Analyzing the vibration acceleration data of the train in three directions at each speed level,the vibration acceleration of the vehicle body in the direction of collector shoe-conductor rail track vibration is the most severe.Analyzing the statistical characteristics of the vehicle body displacement data,it is obtained that the vehicle body displacement generally has a normal distribution characteristic.By considering the comparison of the data of the simulation model before and after the vehicle body vibration,it can be obtained that the vibration of the vehicle body can cause the vibration of the collector shoe intensified.When the collector shoe does not pass through the expansion joint,the vehicle body vibration has little effect on it.When the collector shoe passes through the expansion joint,the vehicle body vibration has a greater impact on it,and the faster train speed is,the greater influence it would exert;After the train speed increases to 120 kilometers an hour,the collector shoe-conductor rail burning arc occurs when the electric shoe passes through the expansion joint affected by the vehicle body vibration.Through the study of the influence of vehicle body vibration on the dynamic performance of the collector shoe-conductor rail system during the running of the medium-low speed maglev train,it can provide a certain theoretical basis for the further speed increase of the maglev train.