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Abstract
At present, steel‐spring floating slabs have been widely used in urban rail transit to reduce the influence of ground vibration caused by vehicle operation on the surrounding environment. As a core part of vibration reduction for floating slab track, the steel‐spring vibration isolator may fail in different forms during operation. In order to study the influence of vibration isolator failure on vehicle operation performance and floating slab track structure vibration reduction effectiveness, a rigid‐flexible coupling dynamic model of vehicle‐rail‐floating slab track is established by multibody dynamics and finite element simulation, and the rationality of the model and its parameters is verified by comparing the theoretical calculation results with the measured data. Based on the model, the failure conditions of steel spring are simulated, considering the failure position and number of steel springs. The results show that the failures of steel‐spring vibration isolators have a significant impact on operating safety and stability of vehicle, and the failure at end is more dangerous than that at midspan. In addition, it also changes the local restraint state of floating slab, resulting in the local vibration mode, which reduces the floating slab track structure vibration reduction effectiveness, mainly within 10 Hz. The different numbers of steel‐spring failures will change the natural modal frequency of floating slab to varying degrees, which may cause the resonance of a certain frequency of the vehicle‐track coupling system, leading to other track structure diseases.
Highlights
Urban rail transit has developed rapidly in recent years
In order to study the influence of steel-spring failure on vehicle operation safety/stability and vibration reduction effectiveness of floating slab track, a dynamic vehicle-rail-floating slab track coupling model was established based on rigid-flexible coupling theory. e steel-spring failure was simulated by assuming that the stiffness and damping of vibration isolators become zero suddenly in the longitudinal distribution direction
(3) When steel-spring failure occurred at the slab end and midspan, compared to normal conditions, the maximum wheel unloading rate increased by 59.9% and 18.4%, respectively. e maximum normal wheel-rail force increased by 7.9% and 2.4%, respectively. e maximum vertical vehicle body acceleration increased by 3.30 and 1.27 times, and the vertical Sperling stability index increased by 50.7% and 22.1%, respectively
Summary
Urban rail transit has developed rapidly in recent years. in the meantime, ambient vibration and noise caused by subway operation have a negative impact on residents’ quality of work and life, normal use of vibrationsensitive equipment, and protection of ancient structures [1,2,3]. erefore, vibration reduction is required in sensitive areas along subway lines. It can be seen that the steel-spring vibration isolator is a discrete bearing structure for the floating slab track and a key part of vibration and noise reduction It consists of inner and outer sleeves, a spiral steel spring, and viscous damping. Erefore, it is necessary to study the influence of steel-spring failure on vehicle operation performance and floating slab track structure vibration reduction effectiveness for providing scientific and theoretical bases for daily maintenance and repair of track, focusing on the failure that the stiffness and damping completely lost. Is paper establishes a rigid-flexible coupling dynamic model of vehicle-rail-floating slab track based on the numerical method and studies steel-spring failure according to the failure position and number of failed pairs, focusing on the influence of steel-spring vibration isolator failure on the operating performance of the vehicle and vibration reduction effectiveness of floating slab track. On the operating performance of the vehicle is studied form the time- and frequency-domain perspectives. e Z vibration level of concrete bed slab under design condition is calculated in order to study the influence of steel-spring vibration isolator failure on the vibration reduction effectiveness of floating slab track, combined with modal analysis
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