Effects of wheel/rail contact patterns and vehicle parameters on lateral stability

Wilson, Nicholas; Wu, Huimin; Tournay, Harry; Urban, Curtis

doi:10.1080/00423114.2010.490590

Cited by 13 publications

(8 citation statements)

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“…The underlying bases for these tests and performance criteria have been well described previously [15,22,23]. AAR is now conducting research to evaluate requirements and performance criteria for loaded hunting [25]. These may include new requirements for track panel shift forces not currently addressed in the AAR requirements.…”

Section: Freight Vehicles: Aar Requirementsmentioning

confidence: 99%

“…• vehicle resonant response [15,23] • lateral instability [2,25] • vehicle overturning [26] • vertical wheel unloading [22,23,27] • flange climb [3,22,24,[28][29][30][31][32][33] • rail rollover [24,34,35] • track panel shift [24,[36][37][38] • longitudinal train forces [39,40] 2. Vehicle derailment safety assessment in Europe…”

Section: Derailment Mechanisms and Assessment Criteriamentioning

confidence: 99%

See 1 more Smart Citation

Assessment of safety against derailment using simulations and vehicle acceptance tests: a worldwide comparison of state-of-the-art assessment methods

Wilson¹,

Fries²,

Witte³

et al. 2011

Vehicle System Dynamics

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2011) Assessment of safety against derailment using simulations and vehicle acceptance tests: a worldwide comparison of state-of-the-art assessment methods,The assessment of derailment safety of new railway vehicle designs is a fundamental concern worldwide. Although the methods used for assessment in different countries and regions vary considerably, the fundamental mechanisms being addressed are the same. This paper provides a detailed review of the current state-of-the-art methods for derailment safety assessment in several regions and countries including Europe, UK, USA, and Russia. Brief overviews of the methods used in China, Korea, and Japan are also included. Similarities and differences are discussed, including testing and computer simulations. References are provided for the origins of the methods and safety performance criteria used in each region. Recommendations are made for improving the assessment methods, especially the use and validation of computer simulations.

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Section: Freight Vehicles: Aar Requirementsmentioning

confidence: 99%

Section: Derailment Mechanisms and Assessment Criteriamentioning

confidence: 99%

Assessment of safety against derailment using simulations and vehicle acceptance tests: a worldwide comparison of state-of-the-art assessment methods

Wilson¹,

Fries²,

Witte³

et al. 2011

Vehicle System Dynamics

Self Cite

View full text Add to dashboard Cite

show abstract

“…References [13,14] applied multi-body simulation models to study the parametric effects for derailment. Wilson et al [15] studied the effects of vehicle suspension parameters and car body inertial parameters, combined with undesirable wheel/rail contact patterns on lateral stability of freight cars with field tests and NU-CARS simulations. Cheli et al [16] carried out a numericalexperimental investigation to evaluate the running safety of tramcar vehicles due to dynamic effects of track geometrical defects.…”

Section: Introductionmentioning

confidence: 99%

Development of a simulation model for dynamic derailment analysis of high-speed trains

2014

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The running safety of high-speed trains has become a major concern of the current railway research with the rapid development of high-speed railways around the world. The basic safety requirement is to prevent the derailment. The root causes of the dynamic derailment of highspeed trains operating in severe environments are not easy to identify using the field tests or laboratory experiments. Numerical simulation using an advanced train-track interaction model is a highly efficient and low-cost approach to investigate the dynamic derailment behavior and mechanism of high-speed trains. This paper presents a three-dimensional dynamic model of a high-speed train coupled with a ballast track for dynamic derailment analysis. The model considers a train composed of multiple vehicles and the nonlinear inter-vehicle connections. The ballast track model consists of rails, fastenings, sleepers, ballasts, and roadbed, which are modeled by Euler beams, nonlinear spring-damper elements, equivalent ballast bodies, and continuous viscoelastic elements, in which the modal superposition method was used to reduce the order of the partial differential equations of Euler beams. The commonly used derailment safety assessment criteria around the world are embedded in the simulation model. The train-track model was then used to investigate the dynamic derailment responses of a high-speed train passing over a buckled track, in which the derailment mechanism and train running posture during the dynamic derailment process were analyzed in detail. The effects of train and track modelling on dynamic derailment analysis were also discussed. The numerical results indicate that the train and track modelling options have a significant effect on the dynamic derailment analysis. The inter-vehicle impacts and the track flexibility and nonlinearity should be considered in the dynamic derailment simulations.

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“…e force between the wheel and rail is changed with the change of wheel-rail contact geometry, which will change the external excitation of the vehicle system accordingly. As it can be seen from the phenomenon of increased hunting motion in the operation of railway vehicles, changes in the amplitude and frequency of the relative operation between the suspension components and the car body will be caused by the poor wheel-rail contact patterns [5], which results in an increase in the possibility of vehicle derailment. Yaw damper, a key component of the secondary suspension connecting the car body and frame, can effectively absorb and alleviate the vibration and impact caused by the change of the wheel-rail relationship, improve the bad contact state between the wheel and the rail, and significantly reduce the lateral vibration of the railway vehicle bogie and the car body so that the vehicle ride quality could be improved [6].…”

Section: Introductionmentioning

confidence: 99%

Coupling Effects of Yaw Damper and Wheel‐Rail Contact on Ride Quality of Railway Vehicle

Zhang

Ran

Wang

et al. 2021

Shock and Vibration

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The ride quality of the railway vehicle is not only affected by the wheel-rail contact geometry but also by the yaw damper. In order to explore this variation law, an equivalent parameter model of the yaw damper was established based on the internal characteristics of the yaw damper, which is both accurate and efficient. Then, considering the influence of wheel wear and wheel-rail contact geometry, ride quality of the railway vehicle under different parameters of yaw damper and wheel-rail contact parameters was analysed. The results show that the wheel-rail contact points are scattered on the wheel profile after the wheel wears out, and the equivalent conicity also tends to increase with the increasing operating mileage. The distribution of ride quality space is sensitive to the change of equivalent conicity. In the low equivalent conicity area, the expansion rate of excellent ride quality space is faster. In the high equivalent conicity area, the expansion rate of qualified ride quality space is faster. Appropriate additional stiffness which is oil stiffness in parallel with structural damping in the equivalent parameter model of the yaw damper can improve the vehicle ride quality. The lateral ride quality is influenced obviously with the condition of the damping of the yaw damper being less than 440 kN·s·m−1. Properly reducing the joint stiffness of the yaw damper could reduce the influence of characteristic parameters of the yaw damper and equivalent conicity of the wheel-rail contact on vehicle lateral ride quality. The optimized characteristic parameters of the yaw damper are used in the actual vehicle test, and the ride quality is effectively improved.

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Effects of wheel/rail contact patterns and vehicle parameters on lateral stability

Cited by 13 publications

References 1 publication

Assessment of safety against derailment using simulations and vehicle acceptance tests: a worldwide comparison of state-of-the-art assessment methods

Assessment of safety against derailment using simulations and vehicle acceptance tests: a worldwide comparison of state-of-the-art assessment methods

Development of a simulation model for dynamic derailment analysis of high-speed trains

Coupling Effects of Yaw Damper and Wheel‐Rail Contact on Ride Quality of Railway Vehicle

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