Investigations of vehicle securing without lashings for Ro-Ro ships

To reduce the area on deck occupied by each car and the labour and time required for lashing and unlashing cars, it has been proposed by the author that in some conditions, cars on decks could be transported without lashing. To evaluate cargo securing based on this “lashing-free” concept, computational code was developed to calculate the vehicle–deck interactions for various ship motions. The code was structured by incorporating a vehicle model into a piece of ship motion calculation code. A series of time-domain simulations were conducted to evaluate vehicle securing. It was found that for a target ship consisting of a 6000-unit Ro-Ro vessel, vehicle securing is mainly influenced by the ship's rolling motions and is highly dependent on the wave height and loading conditions. It was suggested from the analysis that vehicles could be secured without being lashed in a large area of the ship in specific weather conditions and on some routes with less adverse sea states. However, it is still suggested that conventional lashing holes should be constructed on the deck because in severe sea states the cars will still need to be lashed. The limitations of the current investigations are also presented. The relevant research work was carried out at the Division of Ship Design and Engineering, Department of Shipping and Marine Technology, Chalmers University of Technology.     

机车车辆滚动振动试验台和试验方法

本文阐述了机车车辆室内试验台试验的优点，系统介绍了我国自行研制的机车车辆整车滚动振动试验台，从运动自由度、机械结构到系统的组成，并给出试验台的主要功能参数、试验能力，最后介绍了机车车辆动力学试验台试验方法和试验过程。     

便携式蓄电瓶快速测试仪的研制

介绍了大容量蓄电瓶快速测试仪的一种设计方案.     

C2协同决策的一致性检验与优化方法

决策主体执行规则的一致性检验与优化是分布式C^2组织协同决策和群决策设计理论的基础，也是当前军事决策研究关注的热点。针对信息时代协同决策设计理论与指控系统发展需求的矛盾，研究面向分布式指控系统的协同决策设计中决策主体执行决策规则的一致性与优化方法。首先通过经典的检验方法对指控系统获取信息和决策问题进行描述，设定组织协同的决策指标，建立协同规则模型；其次，通过模拟手段，设计协同决策实验环境，对不同决策主体执行规则的过程进行实验验证，得出不同决策主体的负荷等参数；最后，对实验所得参数进行处理，并代回原模型综合检验，验证其一致性，如此反复迭代和优化，从而设计出满足不同决策主体属性的协同决策规则。     

浅议频率法测定斜拉桥的索力

该文介绍了频率法测量斜拉桥索力的测试原理,结合实例,给出某斜拉桥的部分测量结果,并就如何进一步提高索力测量精度进行了探讨。测量表明,用频率法测定索力,结果可靠,简便实用。     

沥青比对试验数据一致性分析

以沥青试验为依托,重点阐述了比对试验的实施方案,数据处理分类,数据内涵,数据分析处理方法,以及对处理数据结果的正确分析。在处理比对试验结果数据上,引入了两个数据一致性统计量k值和h值,从试验结果离散性和准确性统计分析入手,全面评价实验室内试验数据的误差水平和可靠程度,同时,分析试验误差产生原因,给出解决对策。     

沥青混合料的压实特性

文章利用旋转压实仪(SGC)进行旋转压实试验,借助压实特性的四个参数,分析了沥青混合料在施工和使用过程中的压实特性。结果表明:沥青混合料压实特性的主要影响因素是集料级配和沥青用量,粗型级配沥青混合料的抗变形能力未必高于细型级配沥青混合料。     

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经过规范化的发展,已经涌现出不少成熟的企业信息集成(EII)模型,而城市交通信息集成（UTII）方面还缺乏规范、成熟的模型。基于此,本文从流程再造、数据交互以及数据挖掘三个方面,提出了一种城市交通信息集成三维模型（3D-UTII)。这三个维度的集成即为：基于流程再造的交通信息系统内部的深度集成（DDII）,基于异构数据库技术的交通信息系统间的广度集成（EDII）,以及基于数据挖掘技术的分析式集成（ADII）。本文对这三个维度的实施框架和具体实现技术分别做出了进一步阐述,最后使用北京市奥运交通应急系统的信息集成方案为实例对模型的实施做出了说明和验证。     

A framework for travel time variability analysis using urban traffic incident data

This study aims to develop a framework to estimate travel time variability caused by traffic incidents using integrated traffic, road geometry, incident, and weather data. We develop a series of robust regression models based on the data from a stretch in California's highway system during a two-year period. The models estimate highway clearance time and percent changes in speed for both downstream and upstream sections of the incident bottleneck. The results indicate that highway shoulder and lane width factor adversely impact downstream highway clearance time. Next, travel time variability is estimated based on the proposed speed change models. The results of the split-sample validation show the effectiveness of the proposed models in estimating the travel time variability. Application of the model is examined using a micro-simulation, which demonstrates that equipping travelers with the estimated travel time variability in case of an incident can improve the total travel time by almost 60%. The contribution of this research is to bring several datasets together, which can be advantageous to Traffic Incident Management.