NDLI: Design of Flangeway Gap for Restraining Rail

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Design of Flangeway Gap for Restraining Rail

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Hasan, Nazmul
Copyright Year	2012
Abstract	The aim of the paper is to classify restraining rail, discuss the advantages and disadvantages of each type of restraining rail, derive the formula to determine the flangeway gap, and finally, to suggest a type of restraining rail for use. Three types of restraining rail are classified as: 1. Active restraining rail: Defined as the restraining rail that reduces the angle of attack (AOA) by more than 50%. 2. Semi-active restraining rail: Defined as the restraining rail that reduces the AOA by 50% or less, preferably between 40% ∼ 50%. 3. Passive restraining rail: Defined as the restraining rail that does not reduce the AOA. In other words, it plays a passive role in steering the wheel. A design procedure is established to estimate the flangeway gap. The advantages and disadvantages of each type of restraining rail are discussed from design, maintenance, and functional points of view. The issue of optimization of the rail/wheel profile is also discussed in context with the presence of restraining rail. One component of the flangeway gap is the space required for the angularity of the wheel. 2D CAD drawings are not efficient for this purpose, as the drawings cannot consider the AOA and the height of restraining rail on top of the rail level. In this context, Nytram plot is a solution; however, the plot needs a number of sectional drawings at gauge point level, rail level, and the top-of-restraining-rail level from the 3D drawing. A mathematical model that counts both the AOA and the height of restraining rail from the top of the rail level is developed here to capture the essence of the Nytram plot, and thereby to assess the space required for the angularity of the wheel. Finally, a semi-active restraining rail, with a formula for flangeway gap, is suggested for use. Being less elaborate and less time consuming, the formula is easier and quicker than the Nytram plot to estimate flangeway gap. Moreover, one can quickly assess the effect of wheel size, the height of the restraining rail from the top of rail, and the radius of the curve on the flangeway gap.
Sponsorship	Rail Transportation Division
Starting Page	23
Ending Page	27
Page Count	5
File Format	PDF
ISBN	9780791844656
DOI	10.1115/JRC2012-74013
Conference Proceedings	2012 Joint Rail Conference
Language	English
Publisher Date	2012-04-17
Publisher Place	Philadelphia, Pennsylvania, USA
Access Restriction	Subscribed
Subject Keyword	Design Rails Rail wheels Engineering drawings Two-dimensional computer-aided design Wheels Maintenance Gages Optimization
Content Type	Text
Resource Type	Article

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