Research On Dynamic Characteristics Of High Speed Maglev Track Beam System Based On Coupling Vibration Of Vehicle And Bridge

The operation speed of Shanghai maglev train reached 430km/h in2003,and it has been successfully operated for more than ten years,indicating that the high-speed maglev technology has entered a relatively mature and commercial operation stage.At present,the maximum safe operation speed of high-speed railway in China is generally under 350 km/ h,in order to make up for the speed limitation of wheel rail transportation and fill the gap of passenger speed between high-speed railway and air transportation,during the 13 th five year plan,the Ministry of science and Technology launched the key research and development plan of magnetic levitation,organized the research and development of super high speed magnetic levitation and its related key technologies with a speed of over600 km / h.With the further improvement of the speed of maglev,various new mechanical problems come one after another,and the dynamic coupling problem between maglev and track beam system becomes particularly important.The super high speed maglev track beam system is the basis to ensure the safe operation of vehicles,and its related technology is an important aspect to be studied urgently.Therefore,it has important theoretical significance and social value to simulate and analyze the dynamic response of maglev vehicles,track beams and other auxiliary structures.The change rule is an important technical support for the research and development and commercial operation of the super high speed maglev transportation system.In this paper,based on the cross platform coupling analysis framework,aiming at solving the problem of the vertical and horizontal coupled vibration,the dynamic coupling problem of the super-high-speed maglev is studied systematically.Based on the train model with 5 rigid bodies which had 30 degrees of freedom and Timoshenko spatial beam element model which considered the shear effect,the spatial coupling analysis model of the maglev track beam was established.The main achievements were as follows:(1)Based on SIMPACK,ANSYS and SIMULINK,a cross platform coupling analysis software system was built,and a multi-platform simulation calculation method was proposed.The coupling response was realized by establishing the main vehicle system,bridge beam subsystem and control subsystem.(2)Based on the single electromagnet controller and the theory of electromagnetic levitation control,the PID maglev control system based on the position-velocity-acceleration state feedback was established.According to the characteristics of the levitation control system,the general rules of the system based on the state feedback parameters were given.The controller was successfully applied to the vertical and horizontal maglev gap control.(3)Based on the established vehicle-beam-controller coupling analysis framework and calculation model,the vertical dynamic response of maglev vehicle under typical beam span conditions,such as single span simply supported beam,double span continuous beam and three span continuous beam,was simulated and analysed.Based on the simulation results,the effects of vehicle speed,track beam rigidity,density,vehicle mass,secondary suspension,pier parameter vibration and span ratio of three span continuous beam on vehicle bridge coupling vibration response were studied.(4)In order to analyse the horizontal vibration response of maglev system,the horizontal mechanical response of maglev vehicle was simulated and analysed under track irregularity,curvilinear driving and transverse wind.The maglev coupling system is parameterized and some conclusions with engineering guiding significance were obtained.