Influence of static preload on vibration reduction effect of floating slab tracks

Li, Minghang; Ma, Meng; Liu, Lu; Jiang, Bolong

doi:10.1177/1077546318813403

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…In which the spring damping element Combin14 is used to simulate the elastic connection of fastener between rail and slab, as well as the supporting between slab and subgrade, the beam188 element was used to simulate rail, track slab, short sleeper are simulated by element Solid185. 15,16…”

Section: Modeling Of Trackmentioning

confidence: 99%

Abnormal vibration analysis of metro axlebox based on vehicle-track coupling system

Shi

Dai

Wang

et al. 2023

Advances in Mechanical Engineering

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In the operation process of metro, abnormal vibration occurs at the axlebox, and causing structure damage on some components, so the dynamic test was carried out. The result shows that the abnormal vertical vibration about 80–120 Hz is the direct cause in the vehicle operation, and it relates to the type of track bed. According to the track and vehicle, two finite element vertical models of vehicle-track coupling system were established. It determines that the first order vertical bending mode of rail in the coupling system is the excitation source of the abnormal vibration through frequency analysis. And this mode is mainly related to the vertical stiffness of fastener and rubber cushion under short sleeper, which will increase with these stiffness values. Finally, through actual stiffness measurement, it sees that the fastener vertical stiffness values in ordinary track section are mostly reduced to the frequency range corresponding to the first vertical bending mode of rail in the coupling system, which is the cause of abnormal vibration. Therefore, by adjusting the fastener vertical stiffness or adopting the track type to be a damping track bed, the impact of vibration near 80–120 Hz can be reduced, so as to avoid the structural failure of vehicle components and ensure the operation safety of metro vehicles.

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Section: Modeling Of Trackmentioning

confidence: 99%

Abnormal vibration analysis of metro axlebox based on vehicle-track coupling system

Shi

Dai

Wang

et al. 2023

Advances in Mechanical Engineering

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“…The relevant results show that the inclusion of the rail pad nonlinearity into the modelling results in up to 6 dB differences in the peak over a frequency range of 0–200 Hz compared to a linear model [ 16 ]. Ma et al also found that the mitigation effectiveness of the FST is influenced by the preload–track interaction behavior in an experimental test [ 17 ].…”

Section: Introductionmentioning

confidence: 99%

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

et al. 2021

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The purpose of this research was to investigate and improve the accuracy of the existing slab-track mat (STM) specifications in the evaluation of the vibration reduction effect. The static nonlinearity and dynamic mechanical characteristics of three types of STMs were tested, and then a modified fractional derivative Poynting–Thomson (FDPT) model was used to characterize the preload and frequency dependence. A modified vehicle–floating slab track (FST) coupled dynamic model was established to analyze the actual insertion loss. The insertion loss error evaluated by the frequency-dependent tangent stiffness increased with the increase in STM nonlinearity, and the error obtained by the third preload tangent stiffness was usually greater than that of the second preload. Compared with the secant stiffness, the second preload frequency-dependent tangent stiffness was more suitable for evaluating STMs with high-static–low-dynamics (HSLD) stiffness. In order to reflect the frequency dependence effect and facilitate engineering applications, it is recommended that second preload tangent stiffness corresponding to the natural frequency of the FST be used for evaluation. Furthermore, the insertion loss of the STMs with monotonically increased stiffness decreased as the axle load increased, and the opposite was true for the STMs with monotonically decreased stiffness. The vibration isolation efficiency of the STMs with HSLD stiffness was both stable and better than that of the STMs with monotonic stiffness.

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“…Li et al established a simplified FE-IFE coupled model and studied the influence of static preload on the vibration reduction effect of SSFST in the laboratory test. 14 Yang et al studied the dynamic response differences of the soil-tunnel system under moving train loads based on 2D and 2.5D FEM-IFEM. 15 In the aforementioned numerical methods, in order to reduce the calculation time, the simulation of the train is mostly simplified into a single-carriage or moving loads.…”

Section: Introductionmentioning

confidence: 99%

Dynamic characteristic difference of steel-spring floating slab track between single-carriage and multi-carriage models

Chang

Cai

Wang

2021

Noise & Vibration Worldwide

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The steel-spring floating slab track (SSFST) is a low-stiffness structure, sensitive to the vehicle loads. Due to the coupling effect of the superposition of adjacent bogies, it is difficult for conventional single-carriage models to meet the simulation requirements. To find a balance between computation efficiency and authenticity of analytical model results, the influence of carriage number on SSFST should be studied. Based on the finite element method and multi-body dynamics, a refined three-dimensional coupled model of multi-carriage-SSFST-tunnel was established. The difference in the dynamic response of the SSFST between single-carriage and multi-carriage models was analyzed and compared with the measured data. The field test results show that structural displacements and accelerations under the two-carriage model are much closer to the measured data. The dynamic model analysis results show that the maximum displacement of the rail and SSFST in the midspan of the slab increase by 0.48 mm and 0.34 mm under the multi-carriage model, and the vibration reduction effectiveness increases by 1.4–2.0 dB. Dynamic responses of the rail and SSFST show minor differences under the two-carriage and three-carriage models. The article is expected to provide a reference for the theoretical research, design, and layout optimization of subway SSFST.

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Influence of static preload on vibration reduction effect of floating slab tracks

Cited by 8 publications

References 28 publications

Abnormal vibration analysis of metro axlebox based on vehicle-track coupling system

Abnormal vibration analysis of metro axlebox based on vehicle-track coupling system

Evaluation Method of the Vibration Reduction Effect Considering the Real Load- and Frequency-Dependent Stiffness of Slab-Track Mats

Dynamic characteristic difference of steel-spring floating slab track between single-carriage and multi-carriage models

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