沪宁高速公路扩建工程中无连接角（无定向）附合导线的应用

结合沪宁高速公路扩建工程实际情况，对在导线复测中出现的起算导线点数量较少且不能通视，导致导线无法获得起算边（无连接角）的计算问题进行研究，提出解决办法，并通过工程实际运用验证该方法的可行性。     

高速铁路线路内任意点计算中桩里程及偏距算法优化

在常规数学模型的基础上,提出了任意点与线路关系新的计算方法,并对现有的曲线计算数学模型进行了优化,可快速计算地面上任意点在线路中的里程及偏距。     

Large-scale network partitioning for decentralized traffic management and other transportation applications

For numerous large-scale engineering and science problems, domain decomposition (DD) has generally been accepted by research communities as among the most attractive methods to obtain solutions efficiently. As a prerequisite for the DD solution process, a large domain must be partitioned into several smaller subdomains, with the key to success (of any DD partitioning algorithm) being the number of system boundary nodes. The lower this number, the more efficiently the subdomains can be processed. Although various transportation researchers have hinted at the use of DD, for example, in intelligent transportation systems-enabled decentralized traffic management, it is assumed that the partition is given. This article presents a simple, efficient, and effective algorithm to decompose a transportation network into a predefined number of interconnected subdomains such that the number of system boundary nodes is small (first priority) and the number of nodes in each subdomain is of similar size (second priority). To assess the effectiveness (in terms of minimizing the number of system boundary nodes) of the proposed Shortest Distance Decomposition Algorithm, it is compared with METIS version 5.1.0, currently among the most widely used graph partitioning algorithms worldwide. Using large-scale, real-world transportation test networks, it was found that the Shortest Distance Decomposition Algorithm is better than METIS in 21 of the 27 examples tested; on average, it provided (approximately) 42.0% of the system boundary nodes (as compared to METIS results) in our large-scale examples.     

Recent research on welding distortion prediction in thin plate fabrication by means of elastic FE computation

Elastic FE simulation with inherent deformation and interface element is an ideal and practical computational approach for predicting welding distortion in production of thin plate structures. In this study, recent researches on inherent deformation theory and welding induced buckling investigation of ship panel were sequentially introduced. Taking bead-on-plate welding as research objective (plate with 2.28 mm in thickness), integration approach with inherent strain was proposed to accurately and conveniently evaluate magnitude of inherent deformation. Also, average temperature to clarify the mechanism of influential effect of plate width on magnitude of inherent deformation was presented and examined. With the mechanism investigation of welding induced buckling by elastic FE analysis using inherent deformation, an application for predicting and mitigating the welding induced buckling in fabrication of ship panel with thin plates by employing different welding procedure patterns was carried out. Examined intermittent zigzag welding procedure is effective to reduce the magnitude of in-plane inherent shrinkages and control the possible welding induced buckling.     

一类虚拟国界预条件多重网络并行算法

对网格方程组作多重网格区域分裂并行计算,以消去法为预条件,讨论了Gauss消去法的迭代性质,指出该迭代法有效改善通常迭代在子域信息传递过程中的障碍性问题,提高多重网格区域分裂并行计算效率。     

SS5型客运电力机车 8：TGZ8—3640／950型半导体变流装置

本文介绍了SS 5型电力机车半导体变流装置(含磁场削弱晶闸管分路、功率因数补偿装置晶闸管开关)的主要参数、设计特点、主要结构以及桥臂半导体元件的计算方法。     

协同设计软件及其面向对象实现架构

提出了一种基于计算机支持的协同工作(CSCW)的协同设计软件架构，用基于组员标识和面向对象的子场景对象数据来建立工作组整体场景和基于客户／服务器模式的分布式计算与处理机制的协同设计方法。建立了一个新的通信层次——协同层(Collaborative Layer)来代替传统的会话层与表示层用以实现群体(工作组)之间的通信和协作。     

D型便梁在小半径曲线及小线间距区段的应用与计算

D型便梁在既有线的顶进施工过程中的应用已经相当普遍 ,在小半径曲线及小线间距区段下D型便梁的架设计算对设计与施工也有着其实际的使用价值。就该问题进行展开 ,阐明D型便梁在各种曲线半径下的布置方式。     

鱼骨坝工程水流结构与水毁机理研究

鱼骨坝工程是鱼嘴工程中较为典型的布置形式。通过结合水槽概化实验和二维水流数值计算成果,研究了鱼骨坝的水位、流速、流场和动水压强等水力特性,并对水毁原因进行了分析。研究成果对鱼骨坝工程设计具有一定的理论价值。     

管道自然补偿在制氧工厂设计中的应用

文中主要针对管路热补偿方式中自然补偿在制氧工厂设计中的应用做了介绍,并用实际设计实例阐述.通过对管系布置形式做合理的调整,有效地利用管系自然补偿,解决管系热胀冷缩,减少工程投资.