Effects of Track Irregularities on Dynamic Responses of a Moving Maglev Train

2005 ◽  
Author(s):  
Aravind M. Hanasoge ◽  
Steven A. Hans ◽  
Santosh Desetty ◽  
Sebastian Bawab ◽  
Gene Hou ◽  
...  
Keyword(s):  
Dynamic Responses ◽  
Maglev Train ◽  
Track Irregularities

Dynamic interaction of the low-to-medium speed maglev train and bridges with different deflection ratios: Experimental and numerical analyses

2020 ◽  
Vol 23 (11) ◽  
pp. 2399-2413 ◽  
Author(s):  
Dangxiong Wang ◽  
Xiaozhen Li ◽  
Yuwen Wang ◽  
Qikai Hu
Keyword(s):  
Interaction Model ◽  
Field Tests ◽  
Dynamic Interaction ◽  
Dynamic Responses ◽  
Vertical Deflection ◽  
Maglev Train ◽  
Simply Supported ◽  
Medium Speed ◽  
The Stability ◽  
Important Design

The deflection ratio of the bridge is an important design parameter influencing the stability of the low-to-medium speed maglev train by affecting the levitation gap. This study focuses on the dynamic interaction of the low-to-medium speed maglev train and bridges with different vertical deflection ratios and investigates the required bridge vertical deflection ratio for the stability of the maglev train. The experimental investigation is carried out first. Then, a numerical dynamic interaction model is established and verified based on the field tests. And then, the influence of the vertical deflection ratio of a 25 m simply supported girder on the dynamic responses is discussed, as well as the bridges with the same deflection ratio but different span lengths. Finally, the maximum deflection ratios for the bridges with different span lengths are proposed and also compared with that of the existing maglev lines around the world. The study shows that when the deflection ratio reaches a certain level, the dynamic responses increase dramatically. The proposed allowable deflection ratios of bridges with different span lengths can not only ensure the smooth running of the train but also reduce the costs.

Dynamic Interaction Between Freight Train and Steel Bridge

1985 ◽  
Vol 107 (1) ◽  
pp. 60-66 ◽  
Author(s):  
M. H. Bhatti ◽  
V. K. Garg ◽  
K. H. Chu
Keyword(s):  
Dynamic Interaction ◽  
Dynamic Responses ◽  
Impact Factors ◽  
Steel Bridge ◽  
Light Weight ◽  
Freight Train ◽  
Dynamic Forces ◽  
Train Speed ◽  
Track Bridge ◽  
Track Irregularities

The dynamic responses of a railway steel bridge due to vehicle-track-bridge interaction were investigated for the effects of vertical and lateral track irregularities, approach track quality, vehicle weight and type, and train speed. It was found that (1) greater approach irregularities produce higher impact factors and dynamic forces in bridge members; (2) light weight and empty cars produce higher impact factors but small dynamic forces; and (3) impact factors depend on such parameters as axle spacing, suspension system stiffness, truck center distances, etc.

Dynamic Performance of the LMS Maglev Train–Track–Bridge System Under Uneven Settlement for Two Typical Bridges

2020 ◽  
pp. 2150006
Author(s):  
Dangxiong Wang ◽  
Xiaozhen Li ◽  
Ziyan Wu
Keyword(s):  
Numerical Model ◽  
Dynamic Performance ◽  
Interaction Model ◽  
Dynamic Interaction ◽  
Dynamic Responses ◽  
Train Track ◽  
Maglev Train ◽  
Medium Speed ◽  
Track Bridge ◽  
Bridge System

To investigate the dynamic performance of the low-to-medium-speed (LMS) maglev train and bridge system under uneven ground settlement, a refined vertical dynamic interaction model of the LMS maglev train–track–bridge system with uneven settlement is proposed. Firstly, the numerical model is verified based on the field test. Secondly, the dynamic performances of the system induced by uneven settlements are numerically analyzed. Furthermore, numerical studies are carried out to investigate the effect of various uneven settlement types, to compare the performances of the two typical bridges, and to assess the contribution of the F-rail in the presence of uneven settlement. The results show that uneven settlement has a significant enlargement effect on the dynamic responses of the car body and levitation module, but a very weak influence on the bridge. Both the patterns of uneven settlement and bridge types significantly affect the dynamic response of the maglev train to various levels. The numerical model excluding the track structure will overestimate the dynamic responses of the levitation module. It is suggested that the dynamic interaction model for the maglev train–track–bridge system be selected to simulate the influence of uneven settlement for better accuracy.

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