无信号交叉口车流通行状况的混杂Petri网模型

为了准确表征无信号交叉口的车流通行状况,提出了基于混杂Petri网的车流通行模型。该模型将交叉口车流分成不同的优先级别,分别计算每个级别通过交叉口的车流量和排队车辆数,以此表征它们在交叉口的通行状况,其中车流通行优先级别用离散Petri网表示,车流在交叉口的连续通行状况用时延Petri网表示。仿真结果表明:该模型能够比较有效地描述无信号交叉口车流通行的基本特性,满足城市路网建模的需要。     

混流条件下基于TOC制定生产作业计划的关键问题:研究现状及发展探讨

分析了混流生产条件下生产作业计划的特点和MRPⅡ／ERP、JIT的局限,提出并阐述了混流生产条件基于约束理论TOC（Theory of Corstraints）制定生产作业计划的关键问题,即瓶颈环节的确定和转移问题、生产系统中批量和提前期的联合确定问题以及缓冲位置和缓冲大小的确定问题,对解决这些问题的思路和发展作了探讨。     

高温超导与常导混合磁浮系统电磁场仿真研究

高温超导与常导混合磁浮系统以其低功耗、易实现大气隙悬浮、工作悬浮点调节范围宽等优点,有着广阔的发展空间.结合高温超导线材特性以及混合悬浮系统中的设计要素,对单磁铁系统模型运用ANSYS三维仿真分析,给出高温超导线材的临界电流,分析混合悬浮系统的磁场分布及电磁特性.     

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在详细分析遗传算法的局限性的基础上，构造了一种基于遗传算法和禁忌搜索算法相结合的、用于求解车辆路径问题的混合遗传算法。这种混合遗传算法主要是将禁忌搜索算法嵌入到遗传算法中的变异操作与最优解判定之间，可以有效地避免遗传算法易出现“早熟”收敛的问题。然后，分别用混合遗传算法和遗传算法对同一实例进行求解，并对求解结果进行对比分析。结果表明该混合遗传算法的求解结果比遗传算法收敛速度快，更加接近最优解。     

An activity-based assessment of the potential impacts of plug-in hybrid electric vehicles on energy and emissions using 1-day travel data

This paper assesses the potential energy profile impacts of plug-in hybrid electric vehicles and estimates gasoline and electricity demand impacts for California of their adoption. The results are based on simulations replicating vehicle usage patterns reported in 1-day activity and travel diaries based on the 2000–2001 California Statewide Household Travel Survey. Four charging scenarios are examined. We find that circuit upgrades to 240 V not only bring faster charging times but also reduce charging time differences between PHEV20 and PHEV60; home charging can potentially service 40–50% of travel distances with electric power for PHEV20 and 70–80% for PHEV60; equipping public parking spaces with charging facilities, can potentially convert 60–70% of mileage from fuel to electricity for PHEV20, and 80–90% for PHEV60; and afternoons are found to be exposed to a higher level of emissions.     

一种新型车用交流发电机

介绍一种新型混合式励磁方式的车用交流发电机的结构和特点,并分析其优缺点。     

XMQ6116G混合动力城市客车

详细介绍混合动力汽车的工作原理及发展方向,并重点介绍厦门金龙公司所研制的XMQ6116G混合动力客车。     

Modeling the effects of congestion on fuel economy for advanced power train vehicles

Fuel-speed curves (FSC) are used to account for the aggregate effects of congestion on fuel consumption in transportation scenario analysis. This paper presents plausible FSC for conventional internal combustion engine (ICE) vehicles and for advanced vehicles such as hybrid electric vehicles, fully electric vehicles (EVs), and fuel cell vehicles (FCVs) using a fuel consumption model with transient driving schedules and a set of 145 hypothetical vehicles. The FSC shapes show that advanced power train vehicles are expected to maintain fuel economy (FE) in congestion better than ICE vehicles, and FE can even improve for EV and FCV in freeway congestion. In order to implement these FSC for long-range scenario modeling, a bounded approach is presented which uses a single congestion sensitivity parameter. The results in this paper will assist analysis of the roles that vehicle technology and congestion mitigation can play in reducing fuel consumption and greenhouse gas emissions from motor vehicles.     

军事空运装载问题的禁忌搜索算法实现

根据军事空运装载的特点,建立了空运装载的数学模型,考虑了多种现实约束,包括重心、物资放置顺序、物资放置方向以及物资承压约束;讨论了求解空运装载问题的禁忌搜索算法编码、解码、评价函数、邻域操作和禁忌表等关键问题,实现了对空运装载问题的求解。仿真实例表明:该求解方法实用有效,对于空运装载工作有指导意义。     

基于领域本体的垂直搜索引擎模型的研究

用户时于智能化,专业化搜索引擘的需求大力推动了语义搜索的发展.本文在这个需求的环境下提出一种基于领域本体的垂直搜索引擎模型,该模型更加智能化,并且耦合性较低,能满足不同领域的定制和开发.