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| Vibration reduction track stiffness of urban rail transit based on vibration energy |
| WANG Qihao, CAI Xiaopei, CHANG Wenhao, ZHANG Qian |
| School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China |
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Abstract A finite element vehicle-track coupling dynamic model was established to determine the reasonable stiffness of the vibration-reduction track of urban rail transit. The dynamic responses under the condition of 3~200 kN/mm rail support stiffness and 3~6 level rail irregularity spectrum were calculated. The velocity and acceleration signals were processed with a wavelet packet method to obtain the relationship between rail support stiffness, rail irregularity ,and vibration energy. Finally, the suggested rail support stiffness was put forward to reach the lowest energy. The results show that the velocity decreases monotonously with the rail support stiffness, while the acceleration decreases at first and then increases; the high stiffness track is more sensitive to irregularity, so the aggravation of the irregularity will enlarge the vibration energy; the optimal rail support stiffness of urban rail transit should be 5~10 kN/mm, which can be achieved using the combination of low stiffness fastener, sleeper or track; the steel-spring floating-slab has the widest range of application.
Keywords: vibration damping track; energy characteristics; wavelet packet analysis; rail support stiffness
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Received: 17 March 2021
Published: 15 July 2022
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