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19/30326173 DC

This Standard specifies the defect management system the infrastructure manager uses to control the risk of severe accidents due to degradation of internal or surface defects on rails complying with EN 13674-1 EN 13674-2 EN 13674-4 and EN 15689 (excluding grooved rails EN 14811 - which need alternative systems) Get price

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Improved quality of weld repair of rail defects at

Corus Rail has developed a novel technique for the cost effective repair of discrete defects on the running surface of rail The key strength of this novel technique lies in the replacement of those aspects of the conventional Manual Metal Arc (MMA) process that often result in variability in the quality of the repair with automatic and more Get price

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Track Condition Analyser Identification of Rail Rolling

Vertical wheel—rail contact forces with high magnitudes are generated in vehicle operation on track sections with periodic (rail corrugation) or discrete (rail joints crossings) surface defects and/or in operations with out-of-round wheels This may result in severe wheel damage such as subsurface rolling contact fatigue and deep shelling Get price

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Rail Insider

9-7-2019ARM has worked with Sound Transit to implement a European specification for acoustic grinding that breaks rail grinding into two steps grinding to remove surface defects and shape the rail to the desired profile and finish grinding or polishing to ensure a smooth rail finish Measurement and data analysis also plays a critical role Get price

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Railway Wheel Flat and Rail Surface Defect Modelling and

model and predict wheel/rail interaction in the frequency domain no proper time-frequency analysis has yet been reported for the detection of wheel flats and rail surface defects despite the fact that time-frequency analysis method have been widely used for bearing Get price

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Research on Methods of Segmentation for Rail Surface

In image-based rail inspection system the effect of segmentation for rail surface defects is easily affected by the change of illumination and properties of surface reflection This paper proposes a segmentation algorithm for rail surface defect image based on the background subtraction method Get price

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Feasibility in assessing the dipped rail joint defects

Short-wavelength wheel and rail defects such as wheel flats squats on the rail top surface rail welds with poor finishing quality insulated rail joints rail corrugations cause large dynamic contact forces at the wheel–rail interface leading to fast deterioration of the track Get price

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Real time detection system for rail surface defects based

Real time detection system for rail surface defects based on machine vision Yongzhi Min* Benyu Xiao Jianwu Dang Biao Yue and Tiandong Cheng Abstract The detection of rail surface defects is an important part of railway daily inspection according to the requirementsGet price

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In situ monitoring of multi

on a reference grid applied to the rail surface Three dimensional contours of rail In situ monitoring of multi-stage rail surface defects in three dimensions using mobile ultrasonic technique S akdirat Kaewunruen1and Makoto Ishida2 1Birmingham Centre for Railway Research and Education University of Birmingham Birmingham B15 2TT UKGet price

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EFFECT OF GRINDING QUALITY LUBRICATION QUALITY AND RAIL

Cracks will initiate on the rail surface and subsequently develop into discrete or long flaking defects in some cases these defects will cause a detail fracture of the rail Fig 24 schematic drawing showing the contact between a ground rail (black line) and a wheel (red line) Figure 25 shows the superposition of 2 rails profiles fromGet price

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Tribological characterization of rail squat defects

Z Li The determination of a critical size for rail top surface defects to grow into squats in Proceedings of the 8th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM 2009) Firenze Italy September 15–18 2009 Get price

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Railway Engineering Track and Train Interaction

week the main elements of this theory will be presented In addition some wheel and rail sub-surface defects will be explained Rolling contact Nowadays due to the increase of the axle loads and traction power most defects occur in the rail/wheel surface rather than underneath Get price

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A Big Data Analysis Approach for Rail Failure Risk

The rail risk assessment involves detecting the rail defects that can potentially result in rail break and derailment in extreme cases 18-20 Rail surface defects are caused by different factors such as fatigue due to large number of trains passing over rail components at especially welds joints and switches 21 Early detection of surface Get price

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On the Use of Microwave Holography to Detect Surface

25-2-2019The use of microwave holography for detecting rail surface defects is considered in this paper A brief review of available sources on radar methods for detecting defects on metal surfaces and rails is given An experimental setup consisting of a two-coordinate electromechanical scanner and a radar with stepped frequency signal in Get price

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The properties of near

tiple rail breaks can occur because as already mentioned head checks can appear with a very small crack-to-crack spacing Fig 3 Shelling caused by head checks 3 Test methods used to detect near-surface rail defects Up until now rails have been tested exclusively by means of Get price

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(PDF) The Effect of Rail Defects on Track Impact Factors

This paper investigates the effect of rail surface flaws on track impact factors for different track and vehicle conditions For this purpose a three dimensional vehicle and track as an integrated system modelled The vehicle consists car body Get price

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Track Inspector Rail Defect Reference Manual

Track Inspector Rail Defect Reference Manual August 2011 This document is intended only to provide guidance to FRA track inspectors Any legal proceeding instituted against a railroad for failure to comply with the Federal Track Safety Standards must be based on Get price

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Repairing RCF

Instead Brian Whitney Network Rail principal engineer for track and civils spoke of the defects that commonly occur in rails and how to detect them Rolling Contact Fatigue (RCF) is responsible for the majority of rail surface defects and is caused by the high stresses that occur in the tiny contact patch between wheel and rail Get price

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Track geometry

Track geometry is three-dimensional geometry of track layouts and associated measurements used in design construction and maintenance of railroad tracks The subject is used in the context of standards speed limits and other regulations in the areas of track gauge alignment elevation curvature and track surface Get price

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IDGH

Typical defects often found in railroad tracks include transverse and longitudinal defects in the rail head web defects base defects surface defects as well as other miscellaneous damage such as head wear corrosion crushed head burned rail bolt hole cracks head and web separation etc [3] Get price

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Dynamic Wheel/Rail Rolling Contact at Singular Defects

Squats as a kind of short wavelength rail surface defects have become one of the main rolling contact fatigue problems in railways worldwide The purpose of this work is to better understand the squatting phenomenon contribute to reduction and even prevention of Get price

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Research on Rail Surface Defect Inspection System

In order to realize the inspection of rail surface defects with high speed and high precision an automatic detection system based on machine vision is presented The hardware structure of the system consists of the mechanical system control system and visual imaging system The software structure using histogram threshold segmentation multi Get price

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An approach to determine a critical size for rolling

grinding which brings about obvious surface roughness can be applied into the railway practice safely Nevertheless in an open railway system rail RCF can indeed initiate when relatively large surface defects come into being for example at indentations caused by hard objectives trapped in the wheel–rail interface [12] Get price

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Rail inspection

Rail inspection cars and HiRail trucks are the answer to today's high mileage inspection needs The first rail inspection cars were created by Dr Sperry Since then many new models have rolled out These rail inspection cars are basically their own train with inspection equipment on board Get price

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Maintenance of Rail Surface

This defect is caused because of poor maintenance of the joint particularly of the packing of the joint sleepers unclean ballast and bad drainage and also sometimes due to surface defects in the rail such as scabbing As moving loads pass over the joint the joint sleepers get Get price

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Ultrasonic Guided Wave Rail Defect Detection

To develop a rail defect detection system with the following three objectives (a) better defect detection reliability (including internal head defects under shelling and vertical split heads) (b) higher inspection speed than achievable by current rail inspection systems and (c) ability to characterize surface defects to optimize grinding Get price

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TGN

Sand burns occur on the rail surface where luting sand has come in contact with the preheating flame or the pouring steel The sand is heated to temperature where vitrification of the luting material takes place and marks are burned into the surface of the rail These defects are normally removed during the grinding operation Get price

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Rail Surface Inspection – JLI vision

Moving at up to 4 m/s and in the hot end Rails can be surface inspected and characters read Using optical filtering images are enhanced making the rail visually appear as cold As the rail enters the camera ring images from up to 7 cameras are recorded The system saves images of entire rails Get price

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Detection of rail track surface defects based on machine

The detection of rail track surface defects is very important for railway transportation Because different types of defects have their distinct causes and features a single algorithm is not suitable and robust enough for various defects We proposed different algorithms for corresponding defects According to the regular orientation feature of Get price

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Deep convolutional neural networks for detection of rail

Deep Convolutional Neural Networks for Detection of Rail Surface Defects Shahrzad Faghih-Roohi Siamak Hajizadehy Alfredo Nunez˜ y Robert Babuska and Bart De Schutter Delft Center for Systems and Control Delft University of Technology Mekelweg 2 2628 CD Delft The NetherlandsGet price

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Reducing Rail Surface Defect Service Failures on the CSXT

An objective of any rail grinding program is to extend the useful life of the rail which includes reducing the incidence of rail surface defects and resultant service failures This paper outlines the historical grinding practices on CSXT through a transition from corrective 1 toGet price

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Influence of the Fastening Modeling on the Vehicle

Applied to a 3D transient FE model of the vehicle-track interaction influence of the fastening modeling on the high frequency dynamic contact forces at singular rail surface defects (SRSDs) is examined Two defect models one is relatively large and the other is small are employed Get price

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