Simulation Analysis And Parametric Optimization On Coupled Vibration Of High-speed Maglev Train-track Beam Bridge System

The construction of high-speed maglev transportation system is of great significance to fill the speed gap between aviation and high-speed rail transportation of China and improve the three-dimensional high-speed passenger transportation network.With the obvious increase of speed,the vibration problem of maglev vehicle-track beam bridge becomes more prominent,especially under the condition of 600km/h high speed,the vibration characteristics are not clear,which needs to be further studied.Taking the high-speed maglev test line as the research object,based on multi rigid body dynamics and finite element method,this paper establishes the high-speed maglev train-track beam bridge coupling vibration simulation model,and studies the dynamic response of the system under various operating speeds,extreme load conditions and track irregularity excitations;Finally,the parameter optimization analysis and parameter sensitivity of the model are studied.The main work and conclusions of this paper are as follows:(1)According to the structural characteristics of high-speed maglev test line,through the rigid flexible coupling of SIMPACK multi rigid body vehicle model and ANSYS beam element substructure,the coupling vibration analysis simulation model of high-speed maglev train track beam bridge is established.Through the comparison between the simulation results and the measured data in the literature,the reliability and accuracy of the magnetic track relationship and dynamic response of this model are verified.(2)The simulation results show that the high-speed maglev system can maintain a certain degree of safety and comfort at the operating speed of 600km/h,and can allow 10% speed margin;The high-speed maglev system has certain adaptability to each extreme load condition;The excitation of track irregularity samples with large amplitude has a great impact on the vibration response of the system.Track irregularity should be controlled in engineering.(3)Taking the dynamic amplification coefficient of the track beam bridge as the index,the section parameters are optimized.It is found that only increasing the section stiffness has limited effect on the optimization of the dynamic coefficient of the maglev simply supported beam bridge.Taking other key design parameters into consideration is needed to improve the span capacity of the maglev simply supported beam bridge.Based on the existing design codes,the optimization suggestions of mid span deflection,beam end angle and dynamic amplification factor limit are put forward through simulation calculation.(4)The influence of key design parameters on the key response of the system is studied,and the spring stiffness matching of secondary suspension is studied through two factor parameter analysis.According to the parameter sensitivity factor analysis,the primary and secondary degree of each key parameter is distinguished,which is convenient to visually observe the changes of the same design parameter to different responses in the parameter design,and provides a certain basis for the parameter design in engineering.