Exception criteria in vertical track deflection and modulus

Sheng Lu, Cory Hogan, Brock Minert, Richard Arnold, Shane Farritor, William GeMeiner, Dwight Clark

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations

Abstract

The network constraints of freight railroad traffic are moving the industry to heavier tonnage trains, higher axle loads and increased velocity. The dynamics of heavier axle loads and speed produce high stresses in the track infrastructure. Track integrity is strongly related to the vertical track modulus - the relationship between the rail deflection and the vertical applied load. Both low track modulus and large variations in track modulus increase dynamic loading leading to increased maintenance requirements and reduced structural integrity. Currently, there is no widely accepted method to measure vertical track deflection and modulus from a rail car traveling at speed and no criteria exist to relate variations in modulus to the track integrity. This paper presents a method to measure vertical track deflection from a moving rail car. These deflection measurements can then be used to estimate track modulus. Exception criteria are then proposed that can be used to evaluate track quality and prioritize maintenance. Revenue service test results are presented for approximately 350 miles of the Union Pacific Railroad's heavy-haul axle freight line on the South Morrill and Powder River sub-divisions. Finally, the method is compared to other measurements of ride quality including Vehicle Track Interaction (VTI) measurements on the same sections of track.

Original languageEnglish (US)
Title of host publicationProceedings of the ASME/IEEE Joint Rail Conference and the ASME Internal Combustion Engine Division, Spring Technical Conference 2007
Pages191-198
Number of pages8
DOIs
StatePublished - 2007
Event2007 ASME/IEEE Joint Rail Conference and the ASME Internal Combustion Engine Division, Spring Technical Conference, JRCICE2007 - Pueblo, CO, United States
Duration: Mar 13 2007Mar 16 2007

Publication series

NameProceedings of the ASME/IEEE Joint Rail Conference and the ASME Internal Combustion Engine Division, Spring Technical Conference 2007

Conference

Conference2007 ASME/IEEE Joint Rail Conference and the ASME Internal Combustion Engine Division, Spring Technical Conference, JRCICE2007
CountryUnited States
CityPueblo, CO
Period3/13/073/16/07

ASJC Scopus subject areas

  • Automotive Engineering
  • Electrical and Electronic Engineering
  • Mechanical Engineering

Fingerprint Dive into the research topics of 'Exception criteria in vertical track deflection and modulus'. Together they form a unique fingerprint.

  • Cite this

    Lu, S., Hogan, C., Minert, B., Arnold, R., Farritor, S., GeMeiner, W., & Clark, D. (2007). Exception criteria in vertical track deflection and modulus. In Proceedings of the ASME/IEEE Joint Rail Conference and the ASME Internal Combustion Engine Division, Spring Technical Conference 2007 (pp. 191-198). (Proceedings of the ASME/IEEE Joint Rail Conference and the ASME Internal Combustion Engine Division, Spring Technical Conference 2007). https://doi.org/10.1115/JRC/ICE2007-40100