A GIS‐based traffic analysis zone design: technique

The main purpose of this paper is to develop an efficient method to design traffic analysis zones (TAZs), which is necessary for implementing a planning process with Geographic Information System (GIS) for Transportation (GIS‐T), using statistical spatial data analyses and GIS technology. The major roles of GIS in this method are: (1) to produce basic spatial units (BSUs) with topological data structure; (2) to integrate various procedures during the TAZ generation including computer program routines; and (3) to visualize the output of each TAZ generation. One of the most significant reasons for obtaining well‐defined TAZs is the fact that they are defined at the outset of transportation demand modeling, used from trip generation to trip assignment, and will ultimately affect transportation policy decisions.

Toward obtaining well‐defined TAZs, this paper concentrates on two important constraints: homogeneity and contiguity. Iterative partitioning technique is adopted to promote the optimum homogeneity of generated TAZs, while a contiguity checking algorithm is developed to ensure contiguous TAZs are generated by the iterative partitioning technique.     

时速160 km的国外低地板铰接动车组严重晃动问题测试研究

针对国外某型号低地板铰接动车组存在的车体严重晃动、平稳性指标超标以及由此导致的限速运营问题,开展了轮轨接触关系和悬挂系统振动传递情况的线路测试。采用实车线路运行视频监测方法,对车体的运行姿态、悬挂系统振动传递、结构模态及轮对振动等进行了综合分析。结果发现,轮对低频蛇行通过悬挂系统传递给车体,激发出车体的刚体摇头和结构菱形模态耦合振动,从而导致平稳性指标超标。车载视频监测方法发现轮对确实存在1 Hz低频大幅值蛇行运动,空簧变位显著,即视觉上捕捉到了轮对蛇行与车体摇头的关系。经过分析和测试验证,改进的踏面镟修廓形可以改善轮轨接触关系,控制轮对蛇行运动,避免车体异常晃动,保证车辆运行的平稳性。     

基于运距特征分析的高速公路新功能定位研究

根据高速公路近年来发展趋势，对浙江省高速公路发展现状进行分析，梳理了其客货运输现阶段特征；结合综合交通运输体系内各运输方式特点，提出基于分担率函数的优势运距量化分析方法，对公路、铁路、水路及航空四种不同交通运输方式进行选择优化，分别构建了各客、货运方式优势运距模型；结果表明，高速公路现阶段已逐步转向区域间中短途公路运输交流；后依据公路运输优势运距变化，明确了高速公路新时期的功能定位，并为未来浙江省高速公路发展提供了新方向。     

达康三线隧道出口滑塌体的治理

达康隧道出口是三线隧道,开挖断面积大,地质条件差。由于洞口左侧山体出现滑塌,导致已施作的初支变形侵限。经研究采用在清理滑塌体后施作抗滑桩和板桩墙及施作锚杆框架梁对边坡仰坡进行防护,然后施作一段明洞,暗洞改用大管棚超前预支护、双侧壁导坑法开挖进洞、撤换被挤压变形的初期支护。实践证明该处理方法可行,顺利通过了滑坡段,保证了该隧道后期正常施工。     

石灰粉煤灰粒料基层的强度形成机理和裂缝防治

石灰粉煤灰粒料基层中石灰粉煤灰的水化反应和水泥的"二次水化反应"相同,石灰粉煤灰水化反应生成水化硅酸钙等胶凝物是二灰粒料基层强度的主要来源。不同配比的石灰粉煤灰粒料基层的强度不仅取决于石灰粉煤灰混合料的最大干密度的大小,更取决于混合料中石灰粉煤灰胶结料的干密度大小。干缩和温缩裂缝是石灰粉煤灰粒料基层的主要病害,延缓和防止裂缝的出现,可改善半刚性基层路面的使用品质。     

矩阵组织结构及在造船企业中的应用

在以中间产品为导向的现代造船模式下,传统的直线职能式组织结构组织对船厂中间产品的生产管理制约因素逐渐放大。结合矩阵组织理论,增加与船厂职能层级一致的横向项目管理结构,提出应用项目执行清单归类各部(课)的项目作业,描述改进后的组织结构在某制造船厂曲面分段中的应用,满足现阶段船厂生产管理模式需求。     

地下隧道施工遇地下构筑物的处理

城市地下隧道穿越过立交桥、房屋及地下管线时,会造成上述构筑物的沉降,为保证上述构筑物的安全,必须根据地下构筑物与隧道的位置关系采取相应的措施,以控制其沉降在允许范围内。     

移动闭塞信号系统的列车定位方式

移动闭塞信号系统已越来越多地取代传统的固定闭塞信号系统,成为地铁信号系统中的新成员。介绍了阿尔卡特S40移动闭塞信号系统的结构框图、组成及主要功能。分析了该移动闭塞信号系统中的列车定位方式,以便更好地理解移动闭塞的原理及实现方式,为应用及设计信号系统打下良好基础。     

高效集装箱码头装卸工艺方案探讨

提出4个与高效岸桥相匹配的高效集装箱码头装卸工艺方案,并进行初步比较。认为:全自动装卸工艺系统将成为现代集装箱码头的重要发展方向。     

Model-based fault detection and isolation in automotive yaw moment control system

This paper presents a model-based fault detection and isolation technique for automotive yaw moment control system. For this purpose, a novel fault detection and isolation algorithm for a class of actuator-plant systems is proposed. Compared with the existing fault detection and isolation techniques that can only isolate a target fault or require multiple observers to isolate multiple faults, a unique strength of the proposed algorithm is its ability to isolate faults at the component level solely based on the residuals generated by a single observer. The validity of the proposed algorithm, applied to automotive yaw moment control system, is investigated via a simulation study based on a realistic vehicle dynamics model. The results suggest that the proposed algorithm can isolate the component subject to fault while effectively handling two perennial nuisances: sensitivity to disturbances and false alarms due to uncertainties.