Measurement, analysis, and model updating based on the modal parameters of high-speed railway ballastless track

Gao, Liang; An, Bolun; Xin, Tao; Wang, Ji; Pu, Wei

doi:10.1016/j.measurement.2020.107891

Cited by 20 publications

(6 citation statements)

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“…In addition, the various concepts of dynamic loading [ 102 ], and its influence on the behavior of the railway track over an asphalt slab bed was presented by some investigators [ 103 ]. 3D finite element model and laboratory tests were proposed by other investigators to analyze the dynamic behavior of the track bed [ 104 , 105 ]. It has to be mentioned that, despite having some differences, the in situ experiments usually validated the acceptance of the dynamic and numerical modeling [ 106 , 107 ].…”

Section: Review Of Case Studiesmentioning

confidence: 99%

A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

et al. 2020

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Asphalt is a common material that is used extensively for roadways. Furthermore, bituminous mixes have been used in railways, both as asphalt and as mortar. Different agencies and research institutes have investigated and suggested various applications. These studies indicate the benefits of bituminous material under railways, such as improving a substructure’s stiffness and bearing capacity; enhancing its dynamic characteristics and response, especially under high-speed train loads; waterproofing the subgrade; protecting the top layers against fine contamination. These potential applications can improve the overall track structure performance and lead to minimizing settlement under heavy loads. They can also guarantee an appropriate response under high-speed loads, especially in comparison to a rigid slab track. This review paper documents the literature related to the utilization of asphalt and bituminous mixes in railway tracks. This paper presents a critical review of the research in the application of asphalt and bituminous mixes in railway tracks. Additionally, this paper reviews the design and construction recommendations and procedures for asphalt and bituminous mixes in railway tracks as practiced in different countries. This paper also provides case studies of projects where asphalt and bituminous mixes have been utilized in railway tracks. It is anticipated that this review paper will facilitate (1) the exchange of ideas and innovations in the area of the design and construction of railway tracks and (2) the development of unified standards for the design and construction of railway tracks with asphalt and bituminous mixtures.

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Section: Review Of Case Studiesmentioning

confidence: 99%

A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

et al. 2020

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“…High-speed railways (HSRs) are flourishing in various countries owing to their efficiency, convenience, comfort, and low maintenance and repair workload [1]. By the end of 2020, China's HSR mileage reached 38,000 km [2], ranking first in the world.…”

Section: Introductionmentioning

confidence: 99%

Random-Forest Machine Learning Approach for High-Speed Railway Track Slab Deformation Identification Using Track-Side Vibration Monitoring

Guo

Cui

2021

Applied Sciences

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High-speed railways (HSRs) are established all over the world owing to their advantages of high speed, ride comfort, and low vibration and noise. A ballastless track slab is a crucial part of the HSR, and its working condition directly affects the safe operation of the train. With increasing train operation time, track slabs suffer from various defects such as track slab warping and arching as well as interlayer disengagement defect. These defects will eventually lead to the deformation of track slabs and thus jeopardize safe train operation. Therefore, it is important to monitor the condition of ballastless track slabs and identify their defects. This paper proposes a method for monitoring track slab deformation using fiber optic sensing technology and an intelligent method for identifying track slab deformation using the random-forest model. The results show that track-side monitoring can effectively capture the vibration signals caused by train vibration, track slab deformation, noise, and environmental vibration. The proposed intelligent algorithm can identify track slab deformation effectively, and the recognition rate can reach 96.09%. This paper provides new methods for track slab deformation monitoring and intelligent identification.

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“…Based on the modal parameter, the proposed method made Particle Swarm Optimization (PSO) possible to apply, for the model updating of a large-scale railway bridge [10]. In the analysis of vibration characteristics of track structures, Gao [11] carried out 3 model updating schemes, based on the measured modal parameters. In the case of dynamic model updating, the dynamic analysis and objective function of the optimization problem have nonlinear characteristics, which the commonly used Response Surface Method (RSM) [12] is incapable of approximating, therefore the Kriging model is introduced to the dynamic model updating, as a more accurate metamodel.…”

Section: Introductionmentioning

confidence: 99%

Structural model updating based on metamodel using modal frequencies

Wang

Liu

Xue

2021

Frattura Ed Integrità Strutturale

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Modal frequencies are often used in structural model updating based on the finite element model, and metamodel technique is often applied to the corresponding optimization process. In this work, the Kriging model is used as the metamodel. Firstly, the influence of different correlation functions of Kriging model is inspected, and then the approximate capability of Kriging model is investigated via inspecting the approximate accuracy of nonlinear functions. Secondly, a model updating procedure is proposed based on the Kriging model, and the samples for constructing Kriging model are generated via the method of Optimal Latin Hypercube. Finally, a typical frame structure is taken as a case study and demonstrates the feasibility and efficiency of the proposed approach. The results show the Kriging model can match the target functions very well, and the finite element model can achieve accurate frequencies and can reliably predict the frequencies after model updating.

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Measurement, analysis, and model updating based on the modal parameters of high-speed railway ballastless track

Cited by 20 publications

References 50 publications

A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

A Review of Different Aspects of Applying Asphalt and Bituminous Mixes under a Railway Track

Random-Forest Machine Learning Approach for High-Speed Railway Track Slab Deformation Identification Using Track-Side Vibration Monitoring

Structural model updating based on metamodel using modal frequencies

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