Medium And Low Speed Maglev Based On UM And ANSYS Co-simulation Coupled Vibration Analysis Of Vehicle-Track Beam System

As the country grows stronger,the socialist market economic system continues to improve,develops rapidly,and the number of urban populations increases.The growing good life of the people requires strict requirements for urban rail transit.The vibrations brought by traditional wheel-rail trains The noise problem has become increasingly prominent,which has had a certain impact on the normal living of residents along the line.The medium and low speed maglev rail traffic emerges with its strong gradeability,lower noise,more environmental protection,comfortable ride and low terrain requirements.It has a good development prospect in the short-distance transportation in the future.At present,there are two medium and low speed maglev operating lines in China,namely the Changsha Maglev Express Line and the Beijing Maglev Demonstration Line.Many maglev test lines and commercial lines are either in the design preparation stage or in the construction stage.The medium and low speed maglev rail traffic is ushered in a construction climax.Based on the maglev tourism special line of Qingyuan City,this thesis carries out the coupling vibration analysis of the low-speed maglev train-track beam.The main research contents include:(1)The theory of joint multi-body dynamics simulation software UM and large-scale finite element analysis software ANSYS is elaborated.The difficulties and key points of UM and ANSYS co-simulation are introduced,and the detailed technical flow chart is listed.(2)Based on the Symbolic symbol method and the floating reference system,the equations of motion of the train and the equations of motion of the bridge in the multi-body system are established.The design principle of electromagnetic suspension is introduced in detail.Time-domain samples of track irregularities were simulated by trigonometric series.(3)Combined with ANSYS and UM,a medium-low-speed maglev train-track beam coupled vibration model including a 51-DOF vehicle model was established,and then verified by the bridge dynamic load test carried out by the research team in the previous stage.The simulated values agree well with the measured values and can be further studied.Finally,the specification limits are introduced in combination with the existing specifications and technical standards,and the reference dynamic evaluation indicators are proposed.(4)The coupled vibration analysis of the 25 m single-line simply supported beam of the maglev line in Qingyuan City was carried out,and the parameters were analyzed.The influences of vehicle speed,vehicle weight,beam height and vertical stiffness of the secondary suspension were discussed in order to provide reference for the corresponding design.