Research On Modeling And Dynamic Charateristics Of EMS Magnetic Levitation Based On Neuron Control

The EMS maglev train is a non-contact ground rail vehicle,which can overcome the friction between the traditional train and the track,and has advantages in train safety,economy,and comfort.Therefore,EMS maglev trains are gradually moving towards commercial applications due to their unique advantages.Maglev trains are mainly composed of levitation system,guidance system and propulsion system.Generally,low-to-medium speed maglev trains use electromagnetic suction levitation control system.The chopper is the actuator of the levitation system.There are a large number of power switch components inside.Each power switch component generates induced current when it is closed and disconnected.There is electromagnetic interference between electronic components,which affects the normal operation of the train.In order to reduce the influence of electromagnetic interference between components on train operation,the external pulse excitation based on the neuron square wave generator as a chopper is used to improve the anti-electromagnetic interference ability and operational stability of the train suspension system.The specific research contents are as follows:In this paper,the Hodgkin-Huxley model(HH model),a mathematical model closest to the electrophysiological activity of neuron,is adopted in order to design the square wave generator.First,use simulink toolbox of Matlab to set up the whole program for HH model,and the action potential characteristics can be analyzed based on HH model program.The switch module is added to HH model program,which is to establish a square wave generator program.The square wave generator program is used to analyze the characteristics of the duty ratio of wave signal created by the action potential of neuron.Using Minitab software to optimize the model parameters of the square wave generator based on the Smaller-the-better type characteristics of Taguchi method to obtain the optimal parameter combination,provide pulse excitation for the internal switching devices of the subsequent suspension chopper.Secondly,because the four-quadrant hard-switching chopper has the advantages of high efficiency,simple control and easy realization,this paper selects the four-quadrant hard-switching chopper as the research object,and uses Simulink toolbox to build the four-quadrant hard-switching chopper program to study different parameters The simulation result of the output current of the lower chopper;the relevant parameters of the model of the chopper are optimized by using the Smaller-the-better type characteristics of Taguchi method.Finally,the optimized square wave generator program and the chopper program are jointly simulated.By changing the weight and damping parameter values of the electromagnet,the changes of load current,levitation acceleration,levitation speed and levitation gap are obtained,which is to analyze the comfort of the maglev train.Performance and stability provide design basis.