The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper presents lab trials from an ultrasonic technique capable of reliable sub-surface inspection of cast high manganese steel railway crossings. Volumetric inspection of the component is achieved using a combination of low frequency ultrasound and an advanced ultrasonic technique known as Synthetic Aperture Focussing Technique (SAFT) which uses spatial averaging to reduce back-scattered noise...
This paper makes a survey on the current development, underlying issues, and the future prospects associated with China railway signalling monitoring technologies. To overcome the problems involved such as interconnection, data sharing and intelligent analysis, an integrated scheme of the intelligent monitoring and maintenance system for railway signalling systems is further presented. In this scheme,...
A newly installed Remote Condition Monitoring installation delivers a large scale geographically diverse intelligent system performing real-time condition analysis of voltage and frequency for 385 new Jointless Track Circuits on the London Underground. The system is installed across 44 km of deep tube railway in order to predict and prevent failures and subsequent loss of passenger service to the...
Track circuits form a critical part of the UK rail signalling infrastructure. Condition monitoring of track circuits may improve the availability of track circuits, hence improving service levels. Audio frequency track circuit condition monitoring is a relatively new concept and little work has been done on the subject. This paper describes the instrumentation of a length of active track to observe...
This paper describes the challenges in developing an interface for an existing rail infrastructure monitoring system. To do so, the work conducted is described and is compared to existing interface development approaches from other industries. The `effective HMI' approach developed for industrial power plant was elected as a start point and the paper also describes the challenges of applying said...
Condition monitoring or safety monitor is a cost-effective safety protection technique which is widely used in safety-critical industries, such as nuclear plants and aerospace operation. The adoption of safety monitor offers continuous or real-time safety protection at a high level of diversity and its implementation is relatively simple and thus cost-effective for safety verification and validation...
This work presents a study of Dissolved Gas Analysis in samples of mineral insulating oil, corrosive or suspicious corrosive according to the test ASTM D1275B. The results showed that the change of the properties of the attacked surfaces causes a malfunction in the transformer. It seems from the results that the DGA should be consider as important diagnostic tool for the presents of corrosive factors...
This paper summarizes a new development of a compact size on-board device for condition monitoring of railway tracks and the monitoring software. Track irregularities are estimated from a vertical and lateral acceleration and roll rate of a car body. A GPS system and a map-matching algorithm are used to pinpoint the location of faults on tracks. The device is driven by Li-ion battery for 6 hours or...
Wireless sensor network systems as supplied by Senceive are now totally accepted as a cost effective, precise and reliable tool for the condition monitoring of rail, geo-technical and structural assets. They are providing for remote monitoring of assets through the use of low cost, battery powered, high precision, self-configuring wireless sensor systems which can be readily installed with a minimum...
Railway track and its support form a system that must maintain line and level under load. Loss of line and level results in increased stress and can lead to greater track geometry degradation and damage to track components. Transition zones are generally designed so that track stiffness changes gradually over some distance rather than suddenly. This paper describes the development of a laser based...
The monitoring of remote assets or earthworks on Network Rail property can be prohibitive for a multitude of reasons not only limited to power, access and deployment complexities. This problem has led to the development of an Energy Harvesting Data Logger or EHDL, this product has been designed to be a low powered, generic data logger, powered from harvested energy and configurable to multiple applications...
The objective of the digital imaging for condition asset management (DIFCAM) project was to show the feasibility of imaging and laser scanning based techniques for tunnel examination. This was successfully done by developing a demonstrator for monitoring the interior of rail tunnels, reducing or eliminating the need for track access and subjective human visual inspections. This is an example of a...
In this study, for realizing efficient condition monitoring of rail corrugation, we developed two measurement tools. One is the on-board monitoring device to detect the condition of rail corrugation that distributed on railway track on the commercial train. Another one is the trolley to measure the rail surface irregularity of the corrugated rail continuously in site. In addition, we propose the method...
Improvement of railway capability results in heavier axle loads and higher speed lines, which further induces railway subsidence. In order to ensure a good railway performance and reduce railway life cycle costs, railway subsidence should be measured regularly. The paper aims to assess railway performance by monitoring land subsidence along the railway, predicting railway subsidence in the future...
By analysing the key factors affecting the safety of the railway, this study aims to construct an information system to monitor safety performances of China National Railway networks. For each type of asset, there is a monitoring system. To integrate individual system information into a common information platform, it is proposed to use advanced computer network and information processing technology...
During re-signalling of London Underground's Northern Line innovative methods were developed to provide a step change reduction in the number of track closures and improvement in reliability monitoring and performance. The techniques and technologies developed are also applicable to in-service reliability improvement programmes.
Modern railway vehicles incorporate a significant level of built-in condition monitoring. Interfacing these systems to vehicle management units supports powerful fault detection and decision support facilities for the vehicle operators and maintainers. The benefits of such systems are attained through close incorporation of the component systems with the vehicle infrastructure including core data...
Dutch rail operator ProRail is tasked with increasing the availability of their network and has set a goal of zero avoidable faults. As ProRail outsources maintenance of the rail network to contractors, going forward new contracts will be based on performance and the number of faults, rather than unit based charging. Additionally, penalties will be issued for failing to meet the requirements of a...
This article demonstrates that remote condition monitoring of track circuits is a highly cost effective way of improving reliability. By designing monitoring systems to make the outputs for VT1 and HVI track circuits conform to the same asset model and diagnostic tools as for DC track circuits a standard approach can be adopted throughout.
Detection of surface breaking defects, such as rolling contact fatigue (RCF) cracks, is an on-going topic of research within the context of rail inspection. At present, detection and classification of RCF cracks using an ACFM sensor is based on low speed walking stick systems where negligible sensor lift-off changes result in a reasonably stable background signal and hence the defects can be automatically...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.