Optimisation of support stiffness at railway crossings

Grossoni, Ilaria; Bezin, Yann; Neves, Sérgio

doi:10.1080/00423114.2017.1404617

Cited by 26 publications

(12 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…One has been developed in the commercial MBS software VI-Rail using the FlexTrack toolkit [28][29][30], taking advantage of detailed vehicle modelling capabilities and advanced wheel-rail contact algorithms. The second is an independent model developed in Matlab [18], which features a more accurate representation of the rails but uses a simplified vehicle load model.…”

Section: Vehicle-track Interaction Models At Sandcmentioning

confidence: 99%

“…A three-dimensional vehicle-track interaction model (VTI) was established in Matlab [18]. The rail-pad and the trackbed resilient layers were represented using linear spring / dashpot elements in two-layer, discretely supported ballasted track model.…”

Section: 2mentioning

confidence: 99%

“…Some recent studies have used time domain vehicle-track interaction models to address a particular failure type through quantification of damage indices and optimising the system stiffness profile (e.g. [16], [4], [17], [18]). However, there has been no attempt to link the longitudinal variation in support conditions to the wheel-rail contact behaviour at S&C. Current modelling approaches rarely incorporate or are validated using real measurements of track behaviour.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

The role of stiffness variation in switches and crossings: Comparison of vehicle–track interaction models with field measurements

Grossoni¹,

Pen

Jorge

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

View full text Add to dashboard Cite

The performance of switches and crossings compared with plain line is complicated by the presence of movable parts, changing rail geometry and non-uniformities in the composite and/or trackbed stiffness. These features lead to complex vehicle–track interactions and higher maintenance costs. The trackbed stiffness is the least well-controlled engineering property. A greater variability in trackbed stiffness leads to higher differential trackbed settlement and associated poorer track quality. At switches and crossings, changes in trackbed stiffness are exacerbated by changing rail properties which also contribute to changes in the overall composite track stiffness. This work focuses on the role of variations in stiffness on the performance of switches and crossings. Field measurements of bearer displacement were carried out using geophones at a switch and crossing equipped with under sleeper pads. The vehicle–switch and crossing interaction was modelled using a multi-body system and finite element method. The trackbed stiffness along the whole of the switch and crossing was inferred using the measurements of track deflections in an iterative back-calculation taking account of changing rail properties. It is shown that not including the variation in trackbed/composite stiffness leads to significant under/overestimates of the wheel–rail contact forces. Under sleeper pads are shown to reduce absolute maximum loads, but may increase the variation in deflection.

show abstract

Section: Vehicle-track Interaction Models At Sandcmentioning

confidence: 99%

Section: 2mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

The role of stiffness variation in switches and crossings: Comparison of vehicle–track interaction models with field measurements

Grossoni¹,

Pen

Jorge

et al. 2019

Proceedings of the Institution of Mechanical Engineers, Part F:

Self Cite

View full text Add to dashboard Cite

show abstract

“…Global or whole turnout analyses were conducted to evaluate the general behavior of a turnout under static or dynamic conditions [9,11,12], to optimize the design of a turnout [5,21], or to tune the vertical track stiffness [22]. This type of analysis holds the advantage that the components of the track-vehicle couple are relatively simple/simply modeled and therefore, computationally less expensive.…”

Section: Geometry and Materials Propertiesmentioning

confidence: 99%

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

et al. 2019

View full text Add to dashboard Cite

A railway turnout is an essential infrastructure for managing railway traffic flexibility. In contrast, it imposes restrictions on train operations such as lower operational speeds through the turnout due to the complex movements of trains over the turnout. This results in the large-amplitude dynamic responses of the train-turnout interaction. Previous studies have focused on the train-turnout interactions entailing the wheel-rail contact forces and stresses. Very few of the studies considered the effects of the contact forces on the turnout structure and its components such as sleepers and bearers. Those previous studies neglected the dynamic forces and estimated the behavior of train-turnout interactions based on quasi-static calculations. In reality, turnouts are subjected to high impact forces, which can be higher than the permissible track forces. Consequently, a numerical model capable of determining impact forces was developed here, to evaluate the dynamic behaviors of a railway turnout and their effects on such turnout components as bearers, ballast, and so on. The model consists of a structured beam grillage laying on an elastic foundation with rigid wheelsets and a bogie. The model was verified by field measurements. The new insight stemmed from this study shows that neglecting the contribution of dynamic forces can result in the unsafe underestimation of train turnout behaviors.

show abstract

“…Methods for the optimisation of switch support are presented in [11][12][13]. Wheelrail impact analysis have also been performed on various crossings [14][15][16][17] using similar methodologies. Essentially, these works resulted in small modifications of a traditional track switch and none considered the issue of redundancy and fault tolerance, or the basic track arrangement.…”

Section: Introductionmentioning

confidence: 99%

Dynamic analysis and performance of a repoint track switch

Bezin

Sarmiento-Carnevali

Sichani

et al. 2019

Vehicle System Dynamics

Self Cite

View full text Add to dashboard Cite

Repoint is an alternative concept for the design of track switches developed at Loughborough University. The concept, based around a stub switch, offers several improvements over current designs. Through a novel locking arrangement, it allows parallel, multi-channel actuation and passive locking functions, providing a high degree of fault tolerance. The aim of the work presented in this paper is to evaluate the dynamic interaction forces due to the passage of rolling stock over the switch and, particularly, the area of the stub rail ends, in comparison to a conventional switch. Specific behaviour and load transfer conditions from one rail to the other at the joint are analysed, as well as long term wear conditions of the rails. These evaluations are undertaken by means of multi-body dynamic simulations, leading to design refinement of the stub rail ends and the identification of further research and development requirements in their design.

show abstract

Optimisation of support stiffness at railway crossings

Cited by 26 publications

References 13 publications

The role of stiffness variation in switches and crossings: Comparison of vehicle–track interaction models with field measurements

The role of stiffness variation in switches and crossings: Comparison of vehicle–track interaction models with field measurements

New Insights from Multibody Dynamic Analyses of a Turnout System under Impact Loads

Dynamic analysis and performance of a repoint track switch

Contact Info

Product

Resources

About