Research Of High-speed Maglevbridge Dynamic System Based On Fuzzy PID Control

With the development of human science and technology and the improvement of material life,more and more people have put forward higher requirements for the convenience and high comfort of travel,Therefore,the maglev train has attracted more and more attention as a new and green environmental protection means of transportation.At the same time,because maglev transportation has overcame the limitation of traditional wheel-rail transportation that relies on the maximum speed limit of the wheel-rail friction as the driving speed limit,it can effectively make up for the speed range between high-speed passenger trains and passenger aircraft in existing vehicles to address the need for passenger transportation between mid-and long-distance cities.In addition,in order to pursue the speed limit,some scholars put forward the idea of the maglev train operating in a vacuum environment to avoid the problem of air resistance and make the theoretical speed of the maglev transportation reach more than1000km/h.Therefore,as a new type of transportation,maglev transportation is expected to become the leader of a new generation of high-speed passenger transportation in the future.However,traditional wheel-rail high-speed trains have found that when high-speed trains run on bridges,the increase in running speed will aggravate the bridge’s dynamic response to a certain extent.Therefore,in order to ensure the safety and high comfort of the maglev train when it is actually running at high speed,for the design of the high-speed maglev train’s operating line,established an accurate dynamic coupling system and supplemented with an efficient dynamic solution model for the design and optimization of the maglev line is important.Based on this,the following research work is done on the maglev train/bridge coupling system:(1)A maglev train/bridge coupling dynamic model is established,and an efficient fuzzy adaptive maglev control system is introduced to make the extraction more accurate at each time step.The dynamic response analysis of the maglev train/bridge coupling system is performed for accurate electromagnetic force.(2)Using irregularities as incentives,the effects of different vehicle speeds,bridge spans,Rayleigh damping,and bridge stiffness on the vertical dynamic response of the coupled system were analyzed,and the relevant standards for vehicle body comfort and bridge dynamic response are discussed.(3)Referring to the existing research,the traditional wheel-rail train suspension system was used instead of the maglev control system to analyze the dynamic response of the maglev train / bridge coupling system,and the impact of the introduction of the maglev control system on the dynamic response of the maglev train was also compared in order to discuss the necessity of the introduction of magnetic levitation control system.The research results show that the introduction of the control system can significantly reduce the dynamic response of the car body.(4)Considering levitation,nodding,yawing,shaking,and rolling degree,the maglev train is considered as a 9 rigid body with 45 degrees of freedom system,and a three-dimensional maglev train/bridge coupling system model is established,and a dynamic response analysis is performed in order to get more accurate dynamic response analysis and provides reference for the design of bridge parameters.