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关于建设张家口地铁的设想
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作者 陈怀勇 《张家口职业技术学院学报》 2003年第2期1-4,共4页
张家口市人口稠密,道路狭窄,由此而带来许多交通和环境问题。若纵贯市区南北沿清水河建造轻轨铁路(地铁),可有效地缓解市区交通压力,促进市区发展重心南移,以及旧城的现代化改造,同时也有利于环境保护和城市的持续发展。从水文分析看,... 张家口市人口稠密,道路狭窄,由此而带来许多交通和环境问题。若纵贯市区南北沿清水河建造轻轨铁路(地铁),可有效地缓解市区交通压力,促进市区发展重心南移,以及旧城的现代化改造,同时也有利于环境保护和城市的持续发展。从水文分析看,该地铁的安全是有保障的。由于其占地少,建造和运行成本低,经济上可行。此线路贯穿人口稠密区,一旦运行,定会吸引众多客源。 展开更多
关键词 张家口市 地铁建设 城市交通 地铁线路 轨道类型 机车车型 路基保护
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Path planning for taxi of carrier aircraft launching 被引量:21
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作者 WU Yu QU XiangJu 《Science China(Technological Sciences)》 SCIE EI CAS 2013年第6期1561-1570,共10页
Launching efficiency is an important index to measure the fighting capacity of an aircraft carrier. The study on path planning for taxi of carrier aircraft is of great significance for enhancing the launching efficien... Launching efficiency is an important index to measure the fighting capacity of an aircraft carrier. The study on path planning for taxi of carrier aircraft is of great significance for enhancing the launching efficiency. Considering the launching efficiency and the safety in operation of carrier aircraft launching and taking into account the carrier aircraft maneuver performance, deck environment and feature of mission, we proposed a conceptual model which contains the key elements of path planning for taxi of carrier aircraft. Subsequently, the objective function for the path planning problem and its mathematical model containing various constraints were established. With the A * search algorithm, a dynamic weight heuristic function was designed. According to the characteristic of path planning model for taxi of carrier aircraft, a simple and effective detection method was introduced. Finally, a feasible path for taxi of carrier aircraft, which meets the constraints, was presented. Taking the Nimitz-class aircraft carrier as an example, the paths for taxi of carrier aircraft launching from elevators to catapults were planned. Simulation results demonstrated the rationality of the model and the effectiveness of the algorithm. 展开更多
关键词 carrier aircraft CARRIER path planning aircraft taxi carrier aircraft launching
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