Abstract
With the increase of axle weight and speed, the interaction between vehicles and the track becomes more and more intense, and the problem of wheel‐rail dynamic action is more serious. In order to reduce the low‐frequency vibration caused by train operation, a three‐layer elastic track damping structure is proposed. The complex method is used to optimize the dynamic parameters, structural patterns, and coupling relations of the track structure, which allows multiple elastic units to work in harmony with each other to achieve the effects of absorbing vibration energy and reducing vibration transmission. Finally, a real size model experimental platform is set up to verify the dynamic parameter optimization results. The results show that the vertical mode of the main track system of the coupling‐tuned slab damper‐floating slab is 26.898 Hz close to the train excitation frequency, and the corresponding equivalent mass is 6074.53 kg. The amplitude of the vibration components in the 20∼40 Hz band can be reduced to 41.8% by using the complex method. The maximum insertion loss is about 10 dB, and the vibration of low‐frequency band is not amplified.
Highlights
With its advantages of safety, punctuality, comfort, and large capacity, rail transit has become the first choice for citizens to travel [1]
In order to solve this problem, many researchers have done a lot of research on the dynamic characteristics and vibration reduction measures of the track structure
Wilson et al [6,7,8] put forward the method of floating board and optimizing the structure of vehicle bogie to reduce the dynamic interaction between wheel and rail and reduce the vibration and noise caused by train operation
Summary
With its advantages of safety, punctuality, comfort, and large capacity, rail transit has become the first choice for citizens to travel [1]. Wilson et al [6,7,8] put forward the method of floating board and optimizing the structure of vehicle bogie to reduce the dynamic interaction between wheel and rail and reduce the vibration and noise caused by train operation. E results showed that the vibration of steel rail and track bed plate increased after the rubber pad was laid, while the vibration of bridge and ground decreased significantly. To reduce the low-frequency vibration in track engineering, this paper proposes a three-layer elastic track structure of a coupling-tuned slab damper- oating plate. Using the dynamic vibration absorbing principle, a kind of passive damping vibration plate (tuned slab damper) is designed and it can further absorb and consume 20–40 Hz frequency vibration energy and achieve a better damping track vibration damping e ect. The full-size track experiment is adopted to verify the dynamic parameter optimization results of the resonator plate
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