Study of the dynamic vehicle-track interaction in a railway turnout

Blanco-Saura, Antonio Enrique; Velarte-González, José Luis; Ribes-Llario, Fran; Real, Julia

doi:10.1007/s11044-017-9579-2

Cited by 21 publications

(9 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The response characteristics are also evaluated considering a different switch geometry, 200-1/9, which represents a relatively higher magnitude and frequency of excitation. 24 Figure 3 illustrates the path followed during a switch-passing maneuver. Table 3 summarizes the geometric coordinates of the two switch geometries.…”

Section: Methods Of Analysismentioning

confidence: 99%

“…8,23 A switch-passing maneuver in railway vehicles represents a transient excitation, where the magnitude of lateral acceleration may vary rapidly. 24 Furthermore, during a switch-passing maneuver, the railway car undergoes considerable lateral movement, which gives rise to substantial variations in the wheelrail contact forces that have been associated with more significant derailment potential. 25,26 The force arising from the wheel-rail contact, including the flange contact, during a switching maneuver constitutes relatively higher frequency excitation for the liquid cargo.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Ashtiani

Rakheja

Ahmed

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

The movement of the liquid cargo within a partly filled tank car is known to impose additional slosh forces and moments that may adversely affect the dynamic responses of the vehicle. This study is aimed at analyzing the liquid cargo slosh in a partly filled tank car and its effects on vehicle responses during a switch-passing maneuver. A two-dimensional analytical liquid slosh model is formulated for the analyses of the liquid load shift in the roll plane, lateral slosh force, and roll moment through summation of first four antisymmetric modes of the liquid. The analytical slosh model is integrated to a 114 degrees-of-freedom multibody dynamic model of the railway tank car comprising nonlinear wheel–rail contact and contact pairs of the suspension system. The validity of the slosh model is illustrated by comparing the responses with those reported in other studies and those obtained from a nonlinear computational fluid dynamic model. The coupled fluid–vehicle model is subsequently used to study the effects of fluid slosh during switch-passing maneuvers on different response measures, namely roll motion of the tank car, lateral and vertical wheel–rail contact forces, and derailment ratio. The significance of the liquid cargo slosh in the partially filled state is demonstrated by comparing the responses with those of the car with equivalent rigid cargo. The results show that liquid sloshing within the partly filled car can lead to higher magnitudes of car body roll angle and thereby the unloading ratio compared to the conventional rigid cargo car. Switch-passing critical speeds are further identified for different fill ratios and switch geometries. For fill ratios below 80%, the switch-passing critical speeds of the partly filled car are substantially lower compared to those of the equivalent rigid cargo car. Neglecting the contributions due to dynamic slosh force and roll moment arising from a partially filled railway tank car may thus lead to underestimation of the critical speed in switch-passing maneuvers.

show abstract

Section: Methods Of Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Ashtiani

Rakheja

Ahmed

2019

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

show abstract

“…For instance, the topics of active steering of railway vehicles [12], bogie suspension [13] and tilting trains [14] are investigated. Additionally, we note the focus on increasing the knowledge on railway dynamics [15,16], improving health monitoring systems [17,18] and further developing simulation models [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Railway Transition Curves: A Review of the State-of-the-Art and Future Research

Brustad

Dalmo

2020

Infrastructures

View full text Add to dashboard Cite

Transition curves are a useful tool for lateral alignment of railway segments. Their design is important to ensure safe and comfortable travel for passengers and cargo. Well designed transition curves can lead to reduced wear of tracks and vehicles, which is beneficial from a maintenance point of view. Extensive studies have been performed through decades to find transition curves that can replace existing railway segments for the purpose of enhancing certain properties. Those studies seek to form curves that satisfy desired evaluation criteria, which are often connected to geometric continuity between the curve segments, and vehicle dynamics, to secure a smooth ride. This research topic is still ongoing and active at present. Recent results and findings are in line with the developments on the topic of vehicle dynamics and within the railway industry. For this reason it is appropriate to collect and discuss the latest work, since there are no up-to-date detailed literature reviews available. This paper explores the present state-of-the-art of railway transition curves, and identifies some of the research challenges and future research opportunities in the field.

show abstract

“…The finite element method is a popular approach where the rails are modeled as beams, the rail pads as spring-damper elements, the sleepers as either beam or continuum elements, and the ballast and sub-ballast as continuum elements. 37–44 When the focus of the study is the track, it is common to use simpler vehicle models, such as prescribed forces, or assemblages of bodies interconnected by spring-damper elements. 37, 38, 45 Although railway vehicle dynamics models the vehicle-track interaction three-dimensionally, 17,18,27 track dynamics often assume the interaction to be vertical 37, 39, 40, 46, 47 and seldom include the lateral interaction between the wheel and rail.…”

Section: Introductionmentioning

confidence: 99%

A novel methodology to automatically include general track flexibility in railway vehicle dynamic analyses

Costa

Antunes

Magalhães

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part F:

View full text Add to dashboard Cite

The interaction between the rolling stock and the infrastructure plays a crucial role in railway vehicle dynamics. The standard approach consists of using a multibody formulation to model the railway vehicles running on simplified tracks. The track model can be rigid, if it comprises only a geometric description of the rail; semi-rigid, if it considers an elastic foundation underneath the rail; or a moving track model, if it comprises a track section underneath each wheelset traveling with the same speed of the vehicle. Despite their computational inexpensiveness, these approaches do not provide a complete representation of track flexibility and disregard coupling effects with the vehicle and among the track components. This work proposes a methodology to automatically generate finite element models of railway tracks comprising its relevant flexible components, i.e., rails, pads, fastening systems, sleepers, and ballast or slab. The finite element mesh is generated based on a parametric description of the track that allows an accurate description of its geometry, including curvature, cross-level, grade, and irregularities. The methodology is demonstrated with a case study in which a track with a complex geometry is loaded with two different approaches. The first approach prescribes moving loads, which is a typical approach used to design or analyze the infrastructure. The second approach applies loads retrieved from the dynamic analysis of a complete vehicle. The results show the benefits of this method and reveal that prescribed loading underestimates the forces resulting from the vehicle dynamics, which is an important issue on curved sections.

show abstract

Study of the dynamic vehicle-track interaction in a railway turnout

Cited by 21 publications

References 16 publications

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Investigation of coupled dynamics of a railway tank car and liquid cargo subject to a switch-passing maneuver

Railway Transition Curves: A Review of the State-of-the-Art and Future Research

A novel methodology to automatically include general track flexibility in railway vehicle dynamic analyses

Contact Info

Product

Resources

About