畢業(yè)論文外文翻譯---日本鐵路信號(hào)系統(tǒng)的技術(shù)特點(diǎn)考索-wenkub
2023-05-18 23:31:06 本頁(yè)面
【正文】 increase of traffic volume. In 1841, the signal technology was used at the two ends of the North Midland tunnel at the first time. The track circuit for the train detecting was invented in 1872. The following will analyze typical railway signal system developed by Japan National Railways (JNR) and East Japan Railway. For these systems, the level is determined by fixed block or moving block system. Train position locating is taken by the track circuit or onboard train locating device. The information is transmitted through the track circuit or radio. (ATSS) system (Kera, 2020 is automatic train stop device which was introduced into JNR to prevent train collision. In a block section where a train is present, a track circuit detects the train position information, and the control device turns the signal for the section to Red. This status indicates that no other train can go into this block section. All of the other trains must stop before the section. Signals of other sections, into which a train can go, are Green or Yellow. Permitted speed is determined according to the distance to the section with the red signal. There is important relationship between the signal status of a section and the train position. The block system used in ATS which is consisted of the track circuit and signal device is based on the fixed block section. ATSP improved to correct a weakness of ATSS. By using digital information from a transponder, ATSP transmits information about signal aspects and the distance to the next stop signal from the trackside to the train and uses this information to generate the train speed checking pattern. Then the puter pares the actual speed and this pattern. If the actual speed exceeds the pattern speed, the braking system will start. Different from ATSS, ATSP won t require the driver verify. When the train speed approaches the danger pattern, it will alarm the driver. The system engages the service brake at maximum power automatically when the speed pattern approaches the danger pattern. D (Decentralized)ATC is an intelligent onboard system. Every train calculates its appropriate permitted speed according to the stop position information from the ATC central logic system. In high traffic density braking on time can be realized by pattern control. The cost of ground devices is reduced by using general information equipment and a decentralized system. The system contains the flexibility of be able to shorten the train headway without changing ground equipment when rolling stock performance is improved. Operability is improved by indicating the train usage on routes to drivers. Along with information technology develops so rapidly, a new railway traffic control system appears. The system can make trains know its own position information and the distance with others. The developing system is called ATACS (advanced train administer and munication system).ATACS is a new rail control system based on information technology and ADS technology.
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