Measurement and numerical analysis on dynamic performance of the LMS maglev train-track-continuous girder coupled system with running speed-up state

Improving the target running speed on original maglev lines is an economical method to meet the social development demands. With the speed improvement, maglev train-track-bridge system coupled vibration is intensified, seriously affecting the train's moving stability. For this study, vibration performance about the coupled system at measured speeds (100 km/h-150 km/h) are investigated based on field test; then a refined numerical coupling vibration model is developed and validated; finally, vibration characteristics at target speed of 160 km/h are studied by simulation. Results show the accelerations of maglev vehicle increase significantly when running speeds exceed 140 km/h, and F-rail's acceleration is noticeably larger than that of continuous girder and sleeper. The results of this numerical model agree well with those of the field test. When the speed reaches the target of 160 km/h, the amplitude increases in time domain, and dynamic responses are within a reasonable range and meet the standard requirements.