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原文传递 Wheel Profile Management Guidelines for Transit Systems: TCRP Web-Only Document 65

题名：	Wheel Profile Management Guidelines for Transit Systems: TCRP Web-Only Document 65
作者：	Shu, X.
关键词：	Wheel profile##Transit systems##Rail maintenance practices##Transit operations management##Wheel maiintenace guidelines##Surveys##
摘要：	Transportation Technology Center, Inc., (TTCI), a wholly owned subsidiary of the Association of American Railroads (AAR), conducted a survey on wheel profile maintenance practices in rail transit agencies, for the Transportation Research Board’s (TRB) Transit Cooperative Research Program (TCRP) as part of a project to develop wheel profile maintenance guidelines for transit operations. The first task of this project reviewed current wheel profiles and maintenance practices (including representative light rail and heavy rail transit agencies) through system visits and literature review. This report compiles the survey information from a questionnaire, site visits of transit agencies, information from previous TCRP projects, and state-of-the-art research results on wheel profile design and maintenance methodologies from a literature review. The following conclusions and recommendations are made from the Task 1 study: Wheel slide and wheel flats are mainly caused by braking and low adhesion conditions. New anti-slip technologies and devices are needed to reduce wheel flats. Wheel diameter difference on one axle has a significant effect on car lateral stability performance. Allowable wheel diameter difference maintenance limit depends on the vehicle and truck design, especially the truck suspension, and the maintenance limits of other components. Wheel diameter difference in one truck affects car vertical performance such as the wheel load equalization capability. Most transit agencies surveyed do not have wheel tread wear limits. Wheel wear has significant effects on vehicle and track performance. Setting up wear limits on wheels is a complicated issue. It depends on vehicle and track design, maintenance standards of truck components, and operation environment. New wheel design or truing templates should be optimized on the basis of existing rail wear conditions, vehicle design and maintenance standards, and special trackwork maintenance requirements. Wheel truing template profiles need to be evaluated periodically to take into account existing rail wear conditions. Rough surfaces on wheels from wheel truing can increase the risk of flange climb derailment. Smooth surfaces and lubrication could reduce the flange climb derailment risk. The effect of the following maintenance limits on rail car performance will be further investigated in Task 2 of this project: – Wheel diameter differences on one axle, one truck, and one car – Wheel wear and patterns – Multiple-axle wheel wear and patterns – Car type and suspension parameters – The nonlinear equivalent conicity function is a promising index to characterize variations of wheel/rail contact geometry caused by wheel wear or mismatching after truing. However, the correlation between the wheel wear or mismatched wheel diameter and the nonlinear equivalent conicity function has not been fully established. – The application of equivalent conicity defined in International Union of Railways UIC 518 and UIC 519 standards to North American rail transit vehicle performance assessment needs to be further investigated. Guidelines for wheel profile maintenance will be established in Task 2 of this project.
总页数：	137
报告类型：	科技报告