Coupled Vibration Response of Vehicle-U-type Girder System for Medium-low Speed Maglev

Abstract:

In order to evaluate the applicability of U-type girder for medium-low speed maglev transport， a dynamic model of maglev train was established， which involves the proportional-integral-derivative （PID） levitation control system. Meanwhile， a finite element model of the 25 m-span U-type girder with the height of 1.7 m was also built. Then， by using a distributed co-simulation platform for maglev transport system， the dynamic response of maglev vehicle-track-girder system was calculated when the vehicles ran at the speed of 20 to 100 km·h^-1. Numerical results show that the vertical deformation of the U-type girder at the mid-span， the levitation gap fluctuation， the vertical acceleration of the carbody and the U-type girder have little change with the increase of the running speed. The mid-span vertical deformation of the U-type girder does not exceed 3.00 mm， the maximum vertical displacement of the F-type rail is about 3.81 mm， the levitation gap fluctuation is less than 1.00 mm， and the maximum vertical acceleration of the carbody mass center is 0.13 m·s^-2. In particular， the vertical acceleration of the rail adjacent to the rail joints at the mid-span or the beam end of the girder decreases at first and then increases with the increase of the running speed， and the maximum acceleration reaches 5.0g. In sum， the medium-low speed maglev train can run over the U-type girder safely and smoothly.