0

Full Content is available to subscribers

Subscribe/Learn More  >

A Method to Characterize Cyclic Error in the Track Geometry Waveform

[+] Author Affiliations
Steven M. Chrismer, Jonathan M. Wnek

Amtrak, Philadelphia, PA

Paper No. JRC2011-56075, pp. 105-108; 4 pages
doi:10.1115/JRC2011-56075
From:
  • 2011 Joint Rail Conference
  • 2011 Joint Rail Conference
  • Pueblo, Colorado, USA, March 16–18, 2011
  • ISBN: 978-0-7918-5459-4 | eISBN: 978-0-7918-3893-8
  • Copyright © 2011 by ASME

abstract

A method [1] has been found to identify the presence of multiple cycles of harmonic error within track geometry measurement waveforms. This cyclic track geometry error can produce a buildup of resonant motion in vehicles, but may not be readily apparent from viewing the geometry error because it is often masked by the complexity of the waveform. However, due to the resulting large accelerations and poor ride quality, the dynamic rail vehicle response to the cyclic error will be unmistakable when the wavelength is at or close to a resonant frequency of the car body. Cyclic geometry error usually is unobserved and left uncorrected by maintenance because the associated mid-chord offset geometry error is typically far less than the safety limit per FRA. However, by using a band-pass filtering function on profile and alignment space curve data from the Amtrak geometry car, the presence and magnitude of any cyclic error becomes apparent. Further, it was found that shortcomings in the software used to calculate instructions for the tamper limit the effectiveness of tampers to remove the longer wavelengths commonly associated with this cyclic error. Therefore, improved methods to surface track with longer wavelength error are also being investigated.

Copyright © 2011 by ASME
Topics: Errors , Geometry

Figures

Tables

Interactive Graphics

Video

Country-Specific Mortality and Growth Failure in Infancy and Yound Children and Association With Material Stature

Use interactive graphics and maps to view and sort country-specific infant and early dhildhood mortality and growth failure data and their association with maternal

NOTE:
Citing articles are presented as examples only. In non-demo SCM6 implementation, integration with CrossRef’s "Cited By" API will populate this tab (http://www.crossref.org/citedby.html).

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 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