Dynamic Characteristics Analysis And Active Control Strategy Study Of The Spring Type Collector

To solve the bottleneck problem of urban rail transit capacity,many cities have built a subway running at a maximum speed of 120km per hour.The third-rail current system is one of the main ways of current urban rail traffic.Its highest speed is mostly 80 to 90km/h.There is no application precedent for third rail transit system under the 120km/h speed level in China.The maximum running speed of Guangzhou metro line fourteen,which is about to be operated,will be 120km,and the flow mode will adopt the third-rail current mode.The spring type collector is a new type of collector specially designed for this purpose.With the increase of speed,more serious arc and wear phenomena may occur in the current system.Whether the spring type collector can satisfy the requirement of running speed 120km depends on its dynamic characteristics.Therefore,it is particularly important to study the dynamic characteristics of the spring type collector.In this paper,starting from the working principle and motion state of the spring type collector,a rigid flexible coupling model of a spring type collector considering random vibration of vehicle bogie is established.A variable stiffness model based on M_B fractal contact theory is used to describe the contact relationship between the collector slider and the third-rail,based on MATLAB and ADAMS,the contact coupling model of the collector slider and the third-rail under the linear running state is described.The model is applied to simulate the influence of the mass of the collector slider,the stiffness of the swing rod and the speed of the vehicle on the dynamic characteristics of the spring type collector and the quality of the current system.Based on the continuous contact force collision model,the simulation model of the collision between the spring type collector and the third-rail ends is established.Based on the simulation under different conditions,the influence of the third-rail ends slope,vehicle speed,the mass of the collector slider and the stiffness of the swing rod on the dynamic characteristics of the spring type collector through the third-rail ends is analyzed.Through the analysis of the simulation results of two models,it is judged whether the spring type collector can satisfy the requirement of the maximum running speed of 120km.In addition,the dynamic characteristics of spring type collector when the vehicle speed is 160km/h.At the same time,in order to reduce the fluctuation of the contact force of the collector and rail,the active control method of a large number of pantograph network systems is used to study the active control strategy of the spring type collector in this paper.Based on the MATLAB and ADAMS,the active control model of the spring type collector and the third-rail current system is established.The fuzzy controller is designed based on the simulation results of the dynamic characteristics of the spring type collector.By comparing the parameters of the contact force and the vertical displacement of the collector slider before and after the fuzzy control,the expected effect is achieved.