Unconventional Bogie Designs - Their Practical Basis and Historical Background

Scheffel, H

doi:10.1080/00423119508969106

Cited by 25 publications

(8 citation statements)

References 6 publications

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“…The steering mechanism does not affect the yaw stiffness, since Equations (2) and (11) are identical. 2.…”

Section: Radial Truckmentioning

confidence: 97%

A Qualitative Analysis of the Dynamics of Self-Steering Locomotive Trucks

Ahmadian¹,

Huang²

2002

Vehicle System Dynamics

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The primary purpose of this study is to provide a qualitative analysis of the dynamics of the self-steering trucks that are commonly used for freight locomotives ± namely, EMD's Radial Truck and GE's Steerable Truck ± on improving curving performance and increasing adhesion in curves. Although there exists a number of anecdotal statements on the ability of steerable trucks to reduce curving forces and increase adhesion in curves, to the best of our knowledge, there exists no study that provides a qualitative or quantitative analysis of these features of steerable trucks. Two aspects of locomotive trucks are essential for their ability to deliver small curving forces and high adhesion in curves. First, the ability to allow the axles to yaw suf®ciently relative to the truck frames, such that they can hold a small angle of attack with the rail. Second, providing suf®ciently large longitudinal stiffness between the end axles and the axles and truck frame, to accommodate high adhesions. An equivalent stiffness analysis is used to show that the two steerable trucks that are considered for this study are far superior to conventional, three-axle, straight trucks in providing both a smaller angle of attack and a higher longitudinal stiffness for better curving and adhesion characteristics. The qualitative analysis of this study agrees with the experience the railroads have had with their self-steering trucks. The ®ndings of this study indicate that self-steering trucks can result in lower lateral forces, accommodate tighter curves, and deliver higher adhesion in curves; without lowering the critical hunting speed of the locomotive. The results further show that the steering mechanism stiffness can have a large effect on the lateral, longitudinal, and yaw stiffness between the end axles; therefore, signi®cantly lowering curving forces, and increasing adhesion and critical hunting speed of the truck.

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“…The steering mechanism does not affect the yaw stiffness, since Equations (2) and (11) are identical. 2.…”

Section: Radial Truckmentioning

confidence: 97%

A Qualitative Analysis of the Dynamics of Self-Steering Locomotive Trucks

Ahmadian¹,

Huang²

2002

Vehicle System Dynamics

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“…A comprehensive survey of conventional and unconventional bogie designs was given in a state-of-the-art paper by Scheffel [35]. As the heavy haul railways predominantly use the three-piece bogie, only this type of bogie will be described in more detail in this paper.…”

Section: Bogie Designmentioning

confidence: 99%

Wheel/rail interface management in heavy haul railway operations—applying science and technology

Fröhling¹

2007

Vehicle System Dynamics

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The primary objective of the paper is to review science and technologies that have been developed by various scientists and engineers over the years and that have made it possible to push the limits within the wheel/rail interface in the heavy haul railway environment. After describing the wheel/rail stressstate and its consequences, preventative and corrective measures that can assist in optimising wheel and rail life, and thus reduce costs, are reviewed. The significant contribution of measurement and monitoring technologies to quantify the stress-state of the wheel/rail system is highlighted. Finally, a brief review of the fundamentals of contact mechanics, vehicle dynamics and wheel/rail interface analysis software is given.

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“…At high speeds on straight track, a vibratory motion commonly known as hunting may occur. On curved tracks, the bogie typically takes a lozenge positio n. Bogies designed to take advantage of the steering ability of conventional wheelsets having pro®led wheels are called self-steerin g bogies [5]. In general, the use of pro®led wheels improves the natural self-steerin g ability and, as long as the lateral displacement of the wheelset does not exceed the available gauge clearance, the bogies will curve without¯ange contact.…”

Section: Introductionmentioning

confidence: 99%

Freight car curving performance in braked conditions

Berghuvud

2002

Proceedings of the Institution of Mechanical Engineers, Part F:

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R ailway freight vehicles that are run with full payload on long downhill slopes with many tight curves must be braked more or less continuously. The in¯uence of braking on the curving performance of iron ore freight cars equipped with different types of three-piece bogie designs and pneumatically actuated single-block tread brakes run on curved track in a downhill slope is investigated. The focus is put on the change in performance in terms of self-steering ability, track forces and expected wear in contacts between wheels and rails. M odelling and simulation of the strongly non-linear dynamic interaction between vehicle and track in braked conditions are performed. The large in¯uence of wheel/rail pro®le matching and the quite different responses to braking for the studied vehicles are shown.

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Unconventional Bogie Designs - Their Practical Basis and Historical Background

Cited by 25 publications

References 6 publications

A Qualitative Analysis of the Dynamics of Self-Steering Locomotive Trucks

A Qualitative Analysis of the Dynamics of Self-Steering Locomotive Trucks

Wheel/rail interface management in heavy haul railway operations—applying science and technology

Freight car curving performance in braked conditions

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