共查询到14条相似文献,搜索用时 46 毫秒
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关键节点识别对城市轨道交通系统可靠性的提高具有重要作用。针对当前节点关键节点识别方法无法对网络中节点综合属性进行评价的不足,本文综合考虑基于传输效率的重要度贡献矩阵以及节点的介数和度构成的节点综合特征指标,构建节点重要度评价矩阵,提出了城市轨道交通网络关键节点识别方法。以成都轨道交通为例构建拓扑网络并进行关键节点识别,对识别出的30个关键节点的重要度评价结果进行分析,本文方法克服了单一指标无法判断节点重要度的缺点,并与既有方法做连锁故障仿真对比,结果表明本文方法下的网络效率下降得更快,验证了方法的有效性。 相似文献
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确定需要有效连接的节点是普通国省道规划的关键内容,本文以江西省为例,对普通国省道干线公路需要有效连接的节点进行了论证分析,主要包括城镇类节点、运输类节点和经济类节点,为江西省普通国省道网规划布局提供参考依据. 相似文献
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近年来,湖北省积极打造综合客运枢纽示范项目取得了显著成效,但仍然缺乏针对综合客运枢纽城市的统筹规划,亟需建立全省综合客运枢纽城市层级体系。从综合客运枢纽城市概念入手,划分国际性、全国性、区域性和地方性四个综合客运枢纽城市层级,构建综合客运枢纽城市层级评价指标体系,采用“节点重要度+系统聚类”的定量分析与定性分析相结合的方法对湖北省17个市州进行分层布局。最终形成湖北省“1+3+3+8”的综合客运枢纽城市布局体系,用于指导后续全省综合客运枢纽港站布局,推动新时代综合交通运输体系高质量发展。 相似文献
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由于公路路段划分的科学性很大程度上可影响路面的养护与维修的有效性,因而从养护角度来考虑普通干线公路的路段划分,建立一种切合实际且操作简便的划分方法,可以提高路面养护与维修的效果。文章提出采用模糊聚类方法对普通干线公路进行路段划分,介绍了模糊聚类分析法划分路段的步骤及分类方法,并运用该方法对具体养护实例进行了聚类划分,同时综合考虑路面病害分布特征、路面施工连续性等特点,对聚类结果进行调整,验证了该方法的应用效果。 相似文献
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First-order network flow models are coupled systems of differential equations which describe the build-up and dissipation of congestion along network road segments, known as link models. Models describing flows across network junctions, referred to as node models, play the role of the coupling between the link models and are responsible for capturing the propagation of traffic dynamics through the network. Node models are typically stated as optimization problems, so that the coupling between the link dynamics is not known explicitly. This renders network flow models analytically intractable. This paper examines the properties of node models for urban networks. Solutions to node models that are free of traffic holding, referred to as holding-free solutions, are formally defined and it is shown that flow maximization is only a sufficient condition for holding-free solutions. A simple greedy algorithm is shown to produce holding-free solutions while also respecting the invariance principle. Staging movements through nodes in a manner that prevents conflicting flows from proceeding through the nodes simultaneously is shown to simplify the node models considerably and promote unique solutions. The staging also models intersection capacities in a more realistic way by preventing unrealistically large flows when there is ample supply in the downstream and preventing artificial blocking when some of the downstream supplies are restricted. 相似文献
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文章利用有限元软件ANSYS9.0,建立了南宁大桥施工用组合钢塔的异形承压法兰节点有限元模型,并对节点进行了无、有传力板的对比受力分析,得出了传力板能有效降低节点应力水平和提高节点刚度的结论,为大桥施工提供参考。 相似文献