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New approach for the assessment of train/track/foundation dynamics using in-situ measurements of high-speed train induced vibrations.

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Title: New approach for the assessment of train/track/foundation dynamics using in-situ measurements of high-speed train induced vibrations.
Authors: Mezeh, Reda1,2 reda.mezeh@polytech-lille.fr, Mroueh, Hussein2, Hosseingholian, Mohsen1, Sadek, Marwan2
Source: Soil Dynamics & Earthquake Engineering (0267-7261). Jan2019, Vol. 116, p50-59. 10p.
Subjects: Dynamics, High speed trains, Numerical analysis, Euler-Bernoulli beam theory, Noise
Abstract: Abstract This paper presents an experimentally validated numerical model for the simulation of the complex dynamic response of the ballasted track foundation under the excitation of a moving high-speed train. It consists of an infinite Euler-Bernoulli beam that rests on continuous viscoelastic foundation. This study is carried out within the frame of the project: high-speed line "Bretagne" - "Pays de la Loire" (BPL) in which an instrumented straight track with classical ballasted formation is considered. A huge database of measurements is obtained, that's why a preliminary treatment of the field measurements (rail-foundation displacement histories) is performed in order to eliminate the unwanted high-frequency components (noise) from the raw data. Subsequently, the treated data is used to calibrate the dynamic impedances of the simplified foundation model using an iterative curve fitting procedure. In this work, an additional parameter is introduced to model the wheel load diffusion in the track structure. It is represented by the length of the loaded segment beneath the wheel in which the load distribution is inspired from the wheel-induced displacement field. Appropriate charts are given in the velocity range 162–342 km/h. The numerical experiments prove an important capacity of the model to achieve satisfactory results with significantly limited computational effort in view of the modest number of involved degrees of freedom. The use of relevant input parameters increases the efficiency in minimizing the error between measurements and predictions. The findings are very useful for researchers and practitioners working in railway track design. Highlights • The dynamic behavior of classical ballasted track is studied for wide range of train traveling velocities. • The ballasted formation is represented by continuous viscoelastic foundation. • Experimentally-validated dynamic impedances of the equivalent foundation are proposed for the prediction of track response. • The wheel impact on the track structure is modeled by means of exponentially distributed load. [ABSTRACT FROM AUTHOR]
Copyright of Soil Dynamics & Earthquake Engineering (0267-7261) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 133280836
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PubType: Academic Journal
PubTypeId: academicJournal
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  Data: New approach for the assessment of train/track/foundation dynamics using in-situ measurements of high-speed train induced vibrations.
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  Data: <searchLink fieldCode="DE" term="%22Dynamics%22">Dynamics</searchLink><br /><searchLink fieldCode="DE" term="%22High+speed+trains%22">High speed trains</searchLink><br /><searchLink fieldCode="DE" term="%22Numerical+analysis%22">Numerical analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Euler-Bernoulli+beam+theory%22">Euler-Bernoulli beam theory</searchLink><br /><searchLink fieldCode="DE" term="%22Noise%22">Noise</searchLink>
– Name: Abstract
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  Data: Abstract This paper presents an experimentally validated numerical model for the simulation of the complex dynamic response of the ballasted track foundation under the excitation of a moving high-speed train. It consists of an infinite Euler-Bernoulli beam that rests on continuous viscoelastic foundation. This study is carried out within the frame of the project: high-speed line "Bretagne" - "Pays de la Loire" (BPL) in which an instrumented straight track with classical ballasted formation is considered. A huge database of measurements is obtained, that's why a preliminary treatment of the field measurements (rail-foundation displacement histories) is performed in order to eliminate the unwanted high-frequency components (noise) from the raw data. Subsequently, the treated data is used to calibrate the dynamic impedances of the simplified foundation model using an iterative curve fitting procedure. In this work, an additional parameter is introduced to model the wheel load diffusion in the track structure. It is represented by the length of the loaded segment beneath the wheel in which the load distribution is inspired from the wheel-induced displacement field. Appropriate charts are given in the velocity range 162–342 km/h. The numerical experiments prove an important capacity of the model to achieve satisfactory results with significantly limited computational effort in view of the modest number of involved degrees of freedom. The use of relevant input parameters increases the efficiency in minimizing the error between measurements and predictions. The findings are very useful for researchers and practitioners working in railway track design. Highlights • The dynamic behavior of classical ballasted track is studied for wide range of train traveling velocities. • The ballasted formation is represented by continuous viscoelastic foundation. • Experimentally-validated dynamic impedances of the equivalent foundation are proposed for the prediction of track response. • The wheel impact on the track structure is modeled by means of exponentially distributed load. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
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  Data: <i>Copyright of Soil Dynamics & Earthquake Engineering (0267-7261) is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.soildyn.2018.10.024
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      – Code: eng
        Text: English
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        PageCount: 10
        StartPage: 50
    Subjects:
      – SubjectFull: Dynamics
        Type: general
      – SubjectFull: High speed trains
        Type: general
      – SubjectFull: Numerical analysis
        Type: general
      – SubjectFull: Euler-Bernoulli beam theory
        Type: general
      – SubjectFull: Noise
        Type: general
    Titles:
      – TitleFull: New approach for the assessment of train/track/foundation dynamics using in-situ measurements of high-speed train induced vibrations.
        Type: main
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      – PersonEntity:
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            NameFull: Mezeh, Reda
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            NameFull: Mroueh, Hussein
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            NameFull: Hosseingholian, Mohsen
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            NameFull: Sadek, Marwan
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          Dates:
            – D: 01
              M: 01
              Text: Jan2019
              Type: published
              Y: 2019
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              Value: 116
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            – TitleFull: Soil Dynamics & Earthquake Engineering (0267-7261)
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