0
research-article

Determination of the Vertical Vibration of a Ballasted Railway Track to be Used in the Experimental Detection of Wheel Flats in Metropolitan Railways

[+] Author and Article Information
Ricard Sanchis

Mechanical Engineering Department, Universitat Politécnica de Catalunya, Avda. Diagonal n. 647, 08028, Barcelona, Spain
ricard.sanchis@upc.edu

Salvador Cardona

Mechanical Engineering Department, Universitat Politécnica de Catalunya, Avda. Diagonal n. 647, 08028, Barcelona, Spain
salvador.cardona@upc.edu

Jordi Martínez

Mechanical Engineering Department, Universitat Politécnica de Catalunya, Avda. Diagonal n. 647, 08028, Barcelona, Spain
jmartinez.miralles@upc.edu

1Corresponding author.

ASME doi:10.1115/1.4041896 History: Received March 12, 2018; Revised October 25, 2018

Abstract

This article presents a mathematical model used to obtain the vertical vibration of a ballasted railway track when a wheel is passing at a certain speed over a fixed location of the rail. The aim of this simulation is comparing calculated RMS values of the vertical vibration velocity with measured RMS values. This comparison is the base of a proposed time domain methodology for detecting potential wheel flats or any other singular defect on the wheel rolling bands of metropolitan trains. In order to reach this goal, a wheel-rail contact model is proposed; this model is described by the track vertical impulse response and the vertical impulse response of the wheel with the primary suspension, both linked throughout a Hertz nonlinear stiffness. To solve the model for obtaining the wheel-rail contact force, a double convolution method is applied. Several kinds of wheel flats are analysed, from theoretical round edged wheel flats to different real wheel profile irregularities. Afterwards, the vertical vibration velocity at a fixed point in the rail is obtained using a variable kernel convolution method. Running different simulations for different wheel flats, a study of the vertical vibration attenuation along the rail is carried out. Finally, it is proceeded to obtain the temporary evolution of the RMS value of the rail vertical vibration velocity in order to be used as a reference for detecting wheel flats or any other defect. This last work part will be presented in more detail in a second article.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In