With the rapid development of urban rail transit signal technology, the demand of computer interlocking system for signal equipment is higher and higher. DS6-K5B computer interlocking system is a new computer interlocking system jointly developed by China Railway Communication Signal Research and Design Institute and Keizo Corporation of Japan. The system is two - by - two - take - two structure, with high reliability and security. Nevertheless, the failure of DS6-K5B computer interlocking system is inevitable. On the basis of defining the working principle of DS6-K5B computer interlocking system and combining with years of practical experience, the paper presents an effective troubleshooting method for DS6-K5B computer interlocking system. It is proved by practice that this method can quickly eliminate the fault and restore the system to normal working state.
UPS is a kind of energy conversion device which uses battery chemical energy as backup energy to continuously provide electric energy for equipment in case of power failure or abnormal grid failure. We call it Uninterruptible Power Supply (Abbreviated as UPS). UPS can be divided into backup UPS, online interactive UPS and online Dual-Transform UPS according to different working modes.
Wuhan Metro is currently using Kehua UPS, which is an online Dual-Transform power supply system with uninterrupted power frequency. The UPS signal power supply system of Wuhan Metro works uninterruptedly all year round. Whether it can prolong the service life is an important means to measure the maintenance level of technicians and power managers [1]. UPS, which is used in conjunction with intelligent power supply screen, has become an important part of urban rail transit power supply system. Therefore, the efficiency of daily maintenance and fault handling of UPS directly affects the working efficiency of the signal system. This paper will clarify the daily maintenance content of Kehua UPS, and propose common fault information and fault handling steps of Kehua UPS. According to the steps of fault treatment, the fault can be eliminated in the shortest time, so that the Kehua UPS can quickly resume its normal working state.
With the rapid development of Urban Rail Transit, the demand and service quality of communication system for the subway is higher and higher. Good communication system is an important factor to ensure the safe operation of Urban Rail Transit. Telephone Communication is the basic hand of train command in Urban Rail Transit, including public telephone and private telephone. At present, SPC Exchange Technology is adopted in public telephone and private telephone system in Urban Rail Transit while domestic essential equipment suppliers such as ZTE, Huawei and other companies, declared phasing out the production of SPC Exchange Equipment. Thus, a new idea would be put forward to solve this problem. Soft-switch Technology can support various forms of information. It is a new network technology which integrates voice, data, image and fax services. Soft-switch technology as a representative of scientific and technological innovation can be effectively integrated with Urban Rail Transit Communication System. And the quality of communication service can also be improved. Taking Wuhan Metro as an example, this paper discusses Soft-switch technology and its application in urban rail transit communication system. After successful pilot, it can be extended to other cities.
Switch transaction device is the equipment with the highest failure rate in rail transit signaling system. Switch equipment maintenance and fault handling is the core course of rail transit signaling specialty, and also the key technology to ensure the safety of rail transit transportation. With the rapid increase of rail transit mileage, train speed and traffic density, the increase of switch equipment usage frequency leads to the increase of daily maintenance and fault handling workload, which brings great pressure to safety production. Therefore, the ability to quickly diagnose and deal with switch faults is an important guarantee for the safety of rail transit transportation. In view of these reasons, it is particularly important to strengthen the training of operation skills of students and signaling maintenance personnel on the spot, and to improve their ability to deal with equipment failures in a short time. In this paper, an intelligent assessment system based on S700K switch machine is designed and implemented, which can effectively improve the switch maintenance and fault handling level of trainees through practical training and operation.
With the rapid development of urban rail transit signal technology, signal system has more and more requirements for signal infrastructure equipment. Signal basic equipment mainly includes signal generator, track circuit and turnout. Switch machine is an important signal basic equipment used to reliably change the position of turnout, change the direction of turnout, lock the turnout rail, and reflect the position of turnout. It can ensure traffic safety, improve transport efficiency and improve the labor intensity of traffic personnel. For speed-up turnout, it is very efficient to realize turnout conversion by S700K electric switch machine. When the turnout is squeezed or located in the "four-way" position, the sharp rails on both sides are not close to each other. At this moment, it is easy to cause train derailment or rollover, which directly endangers the traffic safety. The maintenance of switch machine is particularly important. Maintenance of switch equipment mainly includes routine maintenance and troubleshooting. In this paper, a new method for the analysis and treatment of electrical faults of S700K electric switch machine will be put forward. By applying the new method proposed in this paper, the electrical fault of S700K electric switch machine can be eliminated in the shortest time. And the turnout can be restored to its normal working state. The new method is also applicable to the analysis and treatment of electrical faults of ZD6, ZYJ7, ZDJ9 and other types of switch machines.
With the rapid development of Urban Rail Transit Signal Technology, the demand of signal power supply system for signal equipment is higher and higher. The signal intelligent power supply panel is the main component of the urban rail traffic signal power supply system. Whether the intelligent power supply panel working or not is directly related to traffic safety. The maintenance of intelligent signal power supply panel is particularly important. Line 7 of Shanghai Metro adopts PMZG Signal Intelligent Power Supply Panel, which is produced by Beijing Jinyujiaxin Polytron Technologies Inc. Maintenance of power supply system mainly includes routine maintenance and troubleshooting. This article will make clear the routine maintenance contents of PMZG Signal Intelligent Power Supply Panel, and put forward the common fault information and troubleshooting methods of PMZG Signal Intelligent Power Supply Panel. In accordance with the steps of fault handling, the faults can be eliminated in the shortest possible time, and PMZG Signal Intelligent Power Supply Panel can be quickly restored to normal working state.
Techniques of remote sensing have been improved incredibly in recent years and very accurate results and high resolution images can be acquired. There exist possible ways to use such data to reconstruct railroads. In this paper, an automated railroad reconstruction method from remote sensing images based on Gabor filter was proposed. The method is divided in three steps. Firstly, the edge-oriented railroad characteristics (such as line features) in a remote sensing image are detected using Gabor filter. Secondly, two response images with the filtering orientations perpendicular to each other are fused to suppress the noise and acquire a long stripe smooth region of railroads. Thirdly, a set of smooth regions can be extracted by firstly computing global threshold for the previous result image using Otsu's method and then converting it to a binary image based on the previous threshold. This workflow is tested on a set of remote sensing images and was found to deliver very accurate results in a quickly and highly automated manner.
The condition detection of rails in high-speed railway is one of the important means to ensure the safety of railway transportation. In order to replace the traditional manual inspection, save manpower and material resources, and improve the detection speed and accuracy, it is of great significance to develop a machine vision system for locating and identifying defects on rails automatically. Rail defects exhibit different properties and are divided into various categories related to the type and position of flaws on the rail. Several kinds of interrelated factors cause rail defects such as type of rail, construction conditions, and speed and/or frequency of trains using the rail. Rail corrugation is a particular kind of defects that produce an undulatory deformation on the rail heads. In high speed train, the corrugation induces harmful vibrations on wheels and its components and reduces the lifetime of rails. This type of defects should be detected to avoid rail fractures. In this paper, a novel method for fast rail corrugation detection based on texture filtering was proposed.
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