Research On The Linear Drive Mode Of The Novel Type Of Safety Door For Railway Platform

With the rapid development of high-speed railways,the safety and reliability of operations have become the focus of attention.At present,the operating frequency and passenger capacity of high-speed railways are continuously increasing,and the number of passengers waiting for trains on railway platforms is also increasing.However,most domestic high-speed rail platforms do not have platform safety doors installed.The main reason is that there are currently many domestic high-speed rail models,which have reached as many as 14;the same platform may stop at different models,and the opening position and opening and closing distances of different models are not consistent.Therefore,it is extremely difficult to design safety doors that can meet different models.In order to ensure the safety of passengers while waiting on the platform,it is urgent to design a safe and efficient platform security door.The existing railway platform safety doors at home and abroad mainly use rotating motors as the driving core,and realize the opening and closing of the doors at a fixed position through a curved and straight mechanical structure.This kind of opening and closing method of platform safety doors is difficult to adapt to different models.This paper proposes a novel type of safety door,which applies a unilateral linear induction motor to the railway platform safety door,which can realize the free marshalling movement of multiple sliding doors,so as to adapt to the synchronous opening and closing requirements of train doors and platform doors when different car models stop.This paper first describes the overall structure of the platform safety door system with linear induction motor as the driving core,including the mechanical structure and electrical drive system of the new platform safety door.This paper proposes a new adaptive safety door system that can match the door opening and closing of different car models.In this system,the precise position servo control of a single safety door and the synchronous control method of multiple safety doors are analyzed in depth,and its control characteristics are analyzed.The corresponding motor controller is designed.By building a finite element dynamic simulation model,the dynamic performance of the linear induction motor driving the platform safety door was analyzed.Later,the thrust characteristics of the motor are proved through experiments.On this basis,the vector control mathematical model of linear induction motor considering side effects is established.And prove its effectiveness through simulation research.Secondly,based on the linear induction motor vector control method,a position servo control model for the safety door is established,which mainly includes two parts: a position controller and a speed controller.First,I tried PID control algorithm as the two controller algorithms.Simulation and experimental research show that it is difficult to meet the control requirements of the new platform safety door.By changing to model-free adaptive control as the speed controller algorithm,the displacement dynamic performance of the linear induction motor is improved and the displacement error is reduced to meet the control requirements of a single safety door.Finally,the free marshalling movement of multiple safety doors requires coordinated control of multiple motors.By building a non-coupling control simulation model,the simulation analysis shows that it is difficult to realize the synchronous control of multiple safety doors only through the non-coupling displacement control algorithm among multiple safety doors.Therefore,the adjacent cross-coupling control based on the minimum axis idea is used as the displacement controller algorithm of the system.The experimental and simulation results show that not only the displacement error of a single safety door is guaranteed within the allowable range,but also multiple safety doors can operate synchronously within the error range.