Insights into the Effect of WJ-7 Fastener Rubber Pad to Vehicle-Rail-Viaduct Coupled Dynamics

Liu, Linya; Zuo, Zhiyuan; Zhou, Yunlai; Qin, Jian

doi:10.3390/app10051889

Cited by 16 publications

(13 citation statements)

References 13 publications

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“…e result of EMD decomposition directly affects the accuracy of subsequent signal processing, so it is necessary to ensure that the IMF component of the EMD decomposition should possess completeness and orthogonality, so that no energy leakage in the decomposition can be guaranteed [24,25]. From the practical point of view, Huang et al consider that there exists orthogonality between all IMFs decomposed by EMD, but there is no rigorous theoretical derivation proving that they are rigorously orthogonal in the overall situation [29,30].…”

Section: Simulation Results Of Wheelset Vertical Accelerationmentioning

confidence: 99%

“…E jk is the leaking energy between imf j and imf k . From the processing steps of EMD decomposition, we can see that, in the actual decomposition process, the mean value curve is obtained by fitting the approximate value, and the decomposed IMF is a part of the original signal, so the different IMF components are approximately orthogonal [29,30]. Huang's theory proves that the EMD orthogonality is in the order of 10 −3 to 10 −2 , and the IMFs are not strictly orthogonal, resulting in the phenomenon of energy leakage and modal aliasing during signal analysis, which will bring errors in the later analysis, making the result inaccurate.…”

Section: Simulation Results Of Wheelset Vertical Accelerationmentioning

confidence: 99%

See 1 more Smart Citation

Research on the Simulation of Wheelset Response Characteristic Identification of Railway Fastener Loosening

Zhang¹,

Peng²,

Zheng³

et al. 2020

Mathematical Problems in Engineering

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Rail fastener is a crucial component equipment to ensure the safe operation of the train, and it is very paramount to detect the loose state of the fastener. In this paper, the vertical vibration acceleration signal of wheelset is taken as the research object, and the loose state of fastener is identified by separating and calculating the key IMF energy entropy. Firstly, based on the finite element theory and the principle of multibody dynamics, the rigid-flexible coupling simulation model of vehicle track is established. Then, the vertical vibration acceleration signals of the wheelset under the speed of 200 km/h are obtained by setting the different loosening degrees of the fastener. Finally, we use optimized HHT to process signals, and the orthogonal empirical mode decomposition method (OEMD) is proposed to optimize the orthogonality of the intrinsic mode function, to eliminate the IMF component having poor correlation with the original signal; the Hilbert time spectrum and information entropy theory are combined to calculate the energy entropy of the key IMF, and the HHT energy entropy evaluation algorithm of the vertical acceleration response signal of the train wheelset is proposed. The simulation results show that the HHT energy entropy of 100% fastener looseness is less than 25%, 50%, and 75%, decreasing trend. The algorithm can recognize the looseness of track fastener through the experiment under different working conditions.

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Section: Simulation Results Of Wheelset Vertical Accelerationmentioning

confidence: 99%

Section: Simulation Results Of Wheelset Vertical Accelerationmentioning

confidence: 99%

Research on the Simulation of Wheelset Response Characteristic Identification of Railway Fastener Loosening

Zhang¹,

Peng²,

Zheng³

et al. 2020

Mathematical Problems in Engineering

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show abstract

“…Wang et al [ 3 ] studied the influences of ambient temperature on rail fasteners and dynamic responses of railway track in the frequency domain. Liu et al [ 4 ] treated track irregularity as fixed-point excitation to study the temperature sensitivity of rubber pad with low-resistance WJ-7B fasteners used in high-speed railway tracks. Their results showed that the stiffness of rail fasteners was sensitive to low temperature, remained stable at high temperature, and showed little impact on the vertical vibration of high-speed railway track.…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Effect of Rail Fastener Failure on Dynamic Responses of Train-Ballasted Track-Subgrade Coupling System for Smart Track Condition Assessment

et al. 2022

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Rail fasteners are among the key components of ballasted track of high-speed railway due to their functionality of fixing rails to sleepers. The failure of rail fastening system hinders the transmission of train loads to underlying track substructure and therefore endangers the operation safety and longevity of ballasted track. This paper first established a three-dimensional (3D) numerical model of the train-ballasted track-subgrade coupling system by integrating multibody dynamics (MBD) and finite element method (FEM). Numerical simulations were then performed to investigate the effects of different patterns of rail fastener failure (i.e., consecutive single-side, alternate single-side, and consecutive double-side) on critical dynamic responses of track structures, train running stability, and operation safety. The results show that the resulting influences of different patterns of rail fastener failure descend in the order of consecutive double-side failure, consecutive single-side failure, and alternate single-side failure. As the number of failed fasteners increases, the range where dynamic responses of track structures are influenced extends, and the failure of two consecutive single-side fasteners exerts a similar influence as that of four alternate single-side fasteners. The failure of single-side fasteners affects dynamic responses of the intact side of track structures relatively insignificantly. The influence of rail fastener failure on track structures exhibits hysteresis, thus indicating that special attention needs to be paid to locations behind failed fasteners during track inspection and maintenance. The occurrence of the failure of two or more consecutive fasteners demands timely maintenance work in order to prevent aggravated deterioration of track structures. The findings of this study could provide useful reference and guidance to smart track condition assessment and condition-based track maintenance.

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“…Cezary et al tested the frequency dependence of UBM and used an FDZ model to evaluate its insertion loss in a two-layer reference system [ 20 ]. In addition to the more well-known frequency dependence, temperature dependence, and amplitude dependence of the polymer materials [ 21 , 22 , 23 , 24 , 25 , 26 , 27 ], the influence of the preload dependence is now being considered. Koroma et al successively proposed the modified KV model [ 28 ] and the Poynting–Thomson (PT) model [ 29 ] considering the preload dependence, which fit better with the measured dynamic stiffness of the fastener pad under different preloads [ 23 ].…”

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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Insights into the Effect of WJ-7 Fastener Rubber Pad to Vehicle-Rail-Viaduct Coupled Dynamics

Cited by 16 publications

References 13 publications

Research on the Simulation of Wheelset Response Characteristic Identification of Railway Fastener Loosening

Research on the Simulation of Wheelset Response Characteristic Identification of Railway Fastener Loosening

Evaluating the Effect of Rail Fastener Failure on Dynamic Responses of Train-Ballasted Track-Subgrade Coupling System for Smart Track Condition Assessment

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

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