JW
J.J.J. Wegdam
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3 records found
1
Crossings are important yet vulnerable parts of a railway network. This warrants that, in the Netherlands (a country with high traffic loads), crossing geometry is measured twice per year by dedicated measurement vehicles. This produces so much (point cloud) data that prioritizing and predicting is not possible by hand. It can be done by automating the assessments, by an automated process of four steps: cleaning the data, generating relevant performance indicators (features) per measurement, drawing conclusions from all features and visualizing/communicating the results. This project encompasses the first three steps for the most common type of crossing (the 1:9 fixed UIC54 common crossing). The results show that the features yield useful information and insights for both prioritizing and predicting.
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Crossings are important yet vulnerable parts of a railway network. This warrants that, in the Netherlands (a country with high traffic loads), crossing geometry is measured twice per year by dedicated measurement vehicles. This produces so much (point cloud) data that prioritizing and predicting is not possible by hand. It can be done by automating the assessments, by an automated process of four steps: cleaning the data, generating relevant performance indicators (features) per measurement, drawing conclusions from all features and visualizing/communicating the results. This project encompasses the first three steps for the most common type of crossing (the 1:9 fixed UIC54 common crossing). The results show that the features yield useful information and insights for both prioritizing and predicting.
Inspecting crossing geometry
Tool development for manual inspections of crossing geometry
Turnouts allow trains to change from one track to another. Therefore, they are an essential part of infrastructure to create and operate a railway network. This project focuses on the (common) crossing; the part of the turnout where the inner rails cross through one another. Because of the shape of the wheels, it is necessary to create a discontinuity in the rail at this location. As a consequence, wheels experience a disturbed support which causes wear, deformation and fatigue on the crossing. In the Netherlands, this problem has a high priority. This is because the Dutch railway network is unique in two ways; it is very dense and it has a high utilisation. Per km2 of land area, the Netherlands has the second highest amount of track length (right after Switzerland). Per km of track, the Netherlands has the second highest amount of passenger kilometres (right after Japan). The consequence is a set of 7000 that are relatively heavy loaded.
In order to extend the lifetime of these crossings, they have to be monitored and maintained. In present practise, some deformations have to be cut off and cracks have to be ground away. This ensures safe wheel passages and prevents fatigue related failures. Such practises are described well, within the current norms.
A less clear topic however, is the maintenance of geometry. Geometry is defined as the cross-sectional shape of the rail. As soon as the geometry of a crossing changes due to deformation and wear, the vehicle behaviour is influenced. Unfavourable geometry can lead to a big amplification of dynamic forces from passing wheelsets. For this reason, maintainers seek for favourable ways to assess and control the shape of worn/deformed crossings. ...
In order to extend the lifetime of these crossings, they have to be monitored and maintained. In present practise, some deformations have to be cut off and cracks have to be ground away. This ensures safe wheel passages and prevents fatigue related failures. Such practises are described well, within the current norms.
A less clear topic however, is the maintenance of geometry. Geometry is defined as the cross-sectional shape of the rail. As soon as the geometry of a crossing changes due to deformation and wear, the vehicle behaviour is influenced. Unfavourable geometry can lead to a big amplification of dynamic forces from passing wheelsets. For this reason, maintainers seek for favourable ways to assess and control the shape of worn/deformed crossings. ...
Turnouts allow trains to change from one track to another. Therefore, they are an essential part of infrastructure to create and operate a railway network. This project focuses on the (common) crossing; the part of the turnout where the inner rails cross through one another. Because of the shape of the wheels, it is necessary to create a discontinuity in the rail at this location. As a consequence, wheels experience a disturbed support which causes wear, deformation and fatigue on the crossing. In the Netherlands, this problem has a high priority. This is because the Dutch railway network is unique in two ways; it is very dense and it has a high utilisation. Per km2 of land area, the Netherlands has the second highest amount of track length (right after Switzerland). Per km of track, the Netherlands has the second highest amount of passenger kilometres (right after Japan). The consequence is a set of 7000 that are relatively heavy loaded.
In order to extend the lifetime of these crossings, they have to be monitored and maintained. In present practise, some deformations have to be cut off and cracks have to be ground away. This ensures safe wheel passages and prevents fatigue related failures. Such practises are described well, within the current norms.
A less clear topic however, is the maintenance of geometry. Geometry is defined as the cross-sectional shape of the rail. As soon as the geometry of a crossing changes due to deformation and wear, the vehicle behaviour is influenced. Unfavourable geometry can lead to a big amplification of dynamic forces from passing wheelsets. For this reason, maintainers seek for favourable ways to assess and control the shape of worn/deformed crossings.
In order to extend the lifetime of these crossings, they have to be monitored and maintained. In present practise, some deformations have to be cut off and cracks have to be ground away. This ensures safe wheel passages and prevents fatigue related failures. Such practises are described well, within the current norms.
A less clear topic however, is the maintenance of geometry. Geometry is defined as the cross-sectional shape of the rail. As soon as the geometry of a crossing changes due to deformation and wear, the vehicle behaviour is influenced. Unfavourable geometry can lead to a big amplification of dynamic forces from passing wheelsets. For this reason, maintainers seek for favourable ways to assess and control the shape of worn/deformed crossings.
Assessing crossing geometry
Expert tool for numerical and experimental assessment of turnout crossing geometry
Master thesis
(2018)
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Jeroen Wegdam, Valeri Markine, Rolf Dollevoet, Andrei Metrikine, Xiangming Liu, I.Y. Shevtsov
This thesis project discusses the development of a fast assessment tool for the performance of railway turnout crossings. The assessment tool is developed in Matlab and allows the user to swiftly set up a model and assess the performance. The rail geometry input can be either design drawings or in situ measured geometry. This allows the user to compare designed, delivered and deployed crossings. Comparisons are made between several types of 1:9 crossings, by assessing the designs from various countries. The vehicle-track interaction is modelled in the commercial multi-body system (MBS) analysis package VI-Rail. The simulations indicate that the automated workflow provides insights similar to manual modelling, while being much faster. The report ends with recommendations based on the geometry comparisons and simulation results.
...
This thesis project discusses the development of a fast assessment tool for the performance of railway turnout crossings. The assessment tool is developed in Matlab and allows the user to swiftly set up a model and assess the performance. The rail geometry input can be either design drawings or in situ measured geometry. This allows the user to compare designed, delivered and deployed crossings. Comparisons are made between several types of 1:9 crossings, by assessing the designs from various countries. The vehicle-track interaction is modelled in the commercial multi-body system (MBS) analysis package VI-Rail. The simulations indicate that the automated workflow provides insights similar to manual modelling, while being much faster. The report ends with recommendations based on the geometry comparisons and simulation results.