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Proceedings of the 2006 IEEE/ASME Joint Rail Conference

Date 4-6 April 2006

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Displaying Results 1 - 25 of 48
  • [Front cover]

    Publication Year: 2006, Page(s): C1
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  • [Breaker page]

    Publication Year: 2006, Page(s): i
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  • [Breaker page]

    Publication Year: 2006, Page(s): ii
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  • Introduction

    Publication Year: 2006, Page(s): iii
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  • Table of contents

    Publication Year: 2006, Page(s):v - ix
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  • Finite element analysis of freight car structures for fatigue life prediction

    Publication Year: 2006, Page(s):1 - 6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3368 KB) | HTML iconHTML

    The Freight Car Fatigue Task Force of the Association of American Railroads noted that changes in FE modeling practices can significantly affect calculated stress values and fatigue lives. The author was actioned to write a recommended practice to promote consistency in this area. This paper is a synopsis of that recommended practice. View full abstract»

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  • Understanding the benefits of long travel constant contact side bearings

    Publication Year: 2006, Page(s):7 - 17
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (9312 KB) | HTML iconHTML

    In 2001, a comprehensive test program was conducted under the AAR strategic research initiatives program by the Transportation Technology Center, Inc. (TTCI), Pueblo, Colorado, to determine the best types of constant contact side bearings (CCSBs) for use in 10 different North American freight cars. Test results indicated that long travel (LT) CCSB designs generally provided the best overall perfor... View full abstract»

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  • Constant contact side bearing set-up height adjustment and the need for level track

    Publication Year: 2006, Page(s):19 - 23
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4048 KB) | HTML iconHTML

    This paper is intended to start an industry discussion on the need for a level track requirement during the installation and adjustment of constant contact side bearings (CCSBs). CCSBs provide critical benefits to railcar performance in the form higher operating speeds and improved negotiation of track irregularities. However, if CCSBs are not installed correctly, these performance improvements ca... View full abstract»

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  • Detecting flat wheels with a fiber-optic sensor

    Publication Year: 2006, Page(s):25 - 30
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4160 KB) | HTML iconHTML

    This paper describes a multimode optical sensor that is deployed on or near railroad tracks, and detects the presence of flat wheels rolling on the rails, based on spectral characteristics of their induced vibrations. The sensing mechanism uses optical interferometry in which modally dispersive coherent light traveling through the multimode fiber mixes at the fiber's terminus, resulting in a chara... View full abstract»

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  • Further studies of forged wheel steel high temperature properties for improved finite element analysis simulations

    Publication Year: 2006, Page(s):31 - 35
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2362 KB) | HTML iconHTML

    This paper describes additional high temperature mechanical property testing conducted as a continuation of work presented at the 2005 ASME IMECE. Finite element analysis (FEA) computer simulations depend on accurate mechanical property data for determination of the thermo-mechanical properties of wheel designs. Additional creep testing of wheel rim samples was conducted at various temperatures to... View full abstract»

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  • The effect of wedge friction conditions on the dynamic wheel-rail contact force on short wavelength defects

    Publication Year: 2006, Page(s):37 - 43
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3616 KB) | HTML iconHTML

    For wagons with three-piece bogies, the suspension dynamic characteristics are largely dependent on the friction condition of the wedge dampers. The influence of changes in wedge friction conditions on the dynamic wheel load is investigated. Comprehensive wagon-track modelling has been developed for the analysis. Simulations show that a small friction coefficient on the wedge contact surfaces can ... View full abstract»

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  • Wheel wear prediction - comparison between analytical approaches and field tests

    Publication Year: 2006, Page(s):45 - 54
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1471 KB) | HTML iconHTML

    There are a number of theoretical and practical techniques to compute rail vehicle wheel wear. For instance, the Archard equation is a well-known tool to determine the worn volume in sliding contact, although it was established for normal loads, sliding distance and the surface hardness. Of course the wear coefficient (called K) used in this equation to differentiate the wear modes, implicitly com... View full abstract»

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  • Hose strap reaction forces in railroad freight cars

    Publication Year: 2006, Page(s):55 - 59
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (5135 KB) | HTML iconHTML

    This paper investigates the reaction forces on hose straps when end hoses are separated while in the charged condition, i.e., the gladhands are uncoupled. Five different end-of-car (EOC) arrangements and four most widely used hose straps are studied and tested. It is found that the load on hose straps is related to EOC arrangement types on the two connected cars. More rigid arrangements give less ... View full abstract»

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  • Simplified representation of rigging efficiency in brake force calculation

    Publication Year: 2006, Page(s):61 - 71
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2777 KB) | HTML iconHTML

    A method is presented for predicting brake shoe force of a rail vehicle as a linear function of effective brake cylinder pressure. Historically, the braking force has been calculated as the product of cylinder pressure, cylinder area, rigging leverage ratio, and an overall system efficiency factor. The efficiency factor, which takes into account frictional forces and other losses, is a non-linear ... View full abstract»

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  • Self powered wireless brake shoe force measurement system for train brakes

    Publication Year: 2006, Page(s):73 - 80
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (6584 KB) | HTML iconHTML

    Railroad freight car safety and maintenance cost is directly related to knowledge of the actual braking force provided by a brake shoe. If the brake force is too low, safety is at risk. If the brake shoe is replaced before the end of it's lifetime to ensure safety, maintenance and thus operating costs are increased. Through Federal Railroad Administration (FRA) funding under the Department of Tran... View full abstract»

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  • Improving the efficiency and effectiveness of railcar safety appliance inspection using machine vision technology

    Publication Year: 2006, Page(s):81 - 89
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (5232 KB) | HTML iconHTML

    Before a train departs a yard, many aspects of the freight cars and locomotives undergo inspection, including their safety appliances. Safety appliances are handholds, ladders and other objects that serve as the interface between humans and railcars during transportation. Federal safety rules govern the design and condition of safety appliances. The current car inspection process is primarily visu... View full abstract»

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  • Determination of the wear criterion

    Publication Year: 2006, Page(s):91 - 95
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2472 KB) | HTML iconHTML

    In different cases in industry such as bearings, rollers and wheel/rail, there are different criteria for predicting the life of the components, being worn. One criterion for determining wear amount in wheel and rail is based on frictional work, to which the removed material is proportional in the contact patch, and is available as an output in ADAMS/RAIL© software. In this paper, an approach... View full abstract»

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  • Simulation and full-scale measurement of the wear in curved tracks

    Publication Year: 2006, Page(s):97 - 101
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2484 KB) | HTML iconHTML

    Rail wear is extremely intensive in curved tracks. In this paper, rail wear condition in curves is discussed. To test, the most critical curve of the second line of Tehran subway was selected. Track, from the viewpoints of either geometrical properties or mechanical properties was modeled in ADAMS/RAILcopy software according to actual situation. After simulation, wear trend was determined for diff... View full abstract»

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  • Determination of the train wheel wear trend, comparing with field measurements

    Publication Year: 2006, Page(s):103 - 107
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (2424 KB) | HTML iconHTML

    In this paper, the train's wheel wear trend is discussed. To test, the second line of Tehran subway was selected, and in order to simulate, both the tracks and fleet of this line were modeled in ADAMS/RAIL©. In different logged distances, the worn wheel profile was measured by Miniprof© and was used in simulation in order to make the simulation more accurate. After simulation process the... View full abstract»

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  • Wheel wear losses from bogie rotation resistance, effects of cant and speed

    Publication Year: 2006, Page(s):109 - 114
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3448 KB) | HTML iconHTML

    Previous investigation on wheel wear losses from bogie rotation resistance have only considered as designed curve operations, with a small cant deficiency present in the curve design. Results in such curves show a relatively small increase in overall wheel and rail wear due to bogie rotation resistance. The bulk of increased wheel/rail wear is caused by rotation friction moments at the centre bear... View full abstract»

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  • Development of airbags for locomotive crew protection

    Publication Year: 2006, Page(s):115 - 120
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (6864 KB) | HTML iconHTML

    The Federal Railroad Administration sponsored this work to examine the feasibility of protecting freight locomotive crew with restraint systems, such as airbags, optimized to specific conditions to which locomotive operators are exposed to. Finite element simulations and full-scale collision tests were conducted for injury mitigation evaluation of the crew with and without airbag protection. Compu... View full abstract»

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  • Effectiveness of alternative rail passenger equipment crashworthiness strategies

    Publication Year: 2006, Page(s):121 - 129
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (6271 KB) | HTML iconHTML

    Crashworthiness strategies, which include crash energy management (CEM), pushback couplers, and push/pull operation, are evaluated and compared under specific collision conditions. Comparisons of three strategies are evaluated in this paper: push versus pull operation (cab car led versus locomotive led consists); conventional versus CEM consists; and incremental CEM versus full-CEM. Rail cars that... View full abstract»

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  • Overview of a crash energy management specification for passenger rail equipment

    Publication Year: 2006, Page(s):131 - 140
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (8952 KB) | HTML iconHTML

    At the request of METROLINK, the Federal Railroad Administration (FRA), with the Federal Transit Administration and the American Public Transportation Association, formed the ad hoc Crash Energy Management Working Group in May 2005. This group developed recommendations for crush zones in passenger rail cars for METROLINK to include in its procurement specification. The Volpe Center provided the Wo... View full abstract»

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  • Developing CEM design standards to improve light rail vehicle crashworthiness

    Publication Year: 2006, Page(s):141 - 147
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4771 KB) | HTML iconHTML

    In recent years extensive effort has been devoted to the development of crashworthiness standards for rail cars spanning modalities from light rail to heavy rail and commuter rail applications. Each mode provides different challenges to the designer, whether it is designing against collisions with similar rail car designs, dissimilar vehicle designs such as freight rail vehicles or other obstructi... View full abstract»

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  • Optimizing vehicle dynamics through a switch while maintaining existing switch lead length

    Publication Year: 2006, Page(s):149 - 160
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (3392 KB) | HTML iconHTML

    Railroad turnouts are discontinuities in the track structure that are needed to move a rail vehicle from one track to another. These discontinuities generate high dynamic forces, to include high lateral forces into and through the switch, due to abrupt or non-uniform changes in track geometry. In the diverging route, these discontinuities frequently create a need for speed restrictions. While ther... View full abstract»

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