新建、改建铁路工程通信、信息系统设计原则的探讨

结合近年来基建工程通信、信息系统建设情况，探讨通信、信息系统设计原则。     

船模快速性试验的分析计算系统及其应用

介绍交通部上海船舶运输科学研究所最近开发的船模快速性试验分析计算程序系统。该系统是在原ＶＡＸ机上使用的３套计算机程序基础上发展而来的,具有精度高、程序中各种选择可灵活组合、拟合插值量与试验点值之间的偏差和标准差可显示等特点。因此该系统比以往使用的计算程序更能适合船模试验委托方所提出的种种要求,是一个比较理想的程序系统。作为系统的应用,给出了阻力、敞水、自航中试验点处的标准差,其值可作为快速性试验在计算阶段引起的不确定度基础。另外用４条船为例,考察了计算中因不同选择引起的结果差异。本系统还能作为快速性预报应用软件中的一个功能模块。     

“低速动力性”说是EQ6100缸体疲劳的理论根源

追溯有EQ6100汽油机缸体疲劳的根源是偏颇的“低速动力性”说导致设计的疏漏。     

DOS应用程序的Windows位图显示技术

本文分析了BMP位图文件格式,提出了一种在DOS应用程序中实现BMF位图文件的直接写屏快速显示方法,最后给出了C程序示例。     

多楔带传动额定功率计算新方法

本文给出一种按预期寿命来计算多楔带传动额定功率的新方法,能合理地计入传动比、带长对传动能力的影响,并易于编排计算机程序。介绍了计算公式,确定设计常数的依据。提供了计算用表和计算示例。     

南京长江第三大桥钢塔柱设计与加工

南京长江三桥钢混结合区置于索塔下横梁顶面。为避免涡激振动和驰振,通过10种切角方案和3种切角形式断面不同攻角情况下风洞试验对塔柱进行选型,并在塔端设置一组制振设备,以控制索塔架设过程中的振动。节段连接采用高强度螺栓。使用ANSYS程序进行结构有限元分析,对最不利的施工状态进行检算。在工厂制造板块和锚箱,在工地组焊钢塔柱节段,在桥位进行钢塔柱节段安装。通过焊接评定试验,确定焊接工艺和焊接顺序,采用大型数显端面加工落地铣镗床和精密测量设备,确保加工精度。     

基于CATIA V6的某液化气船货舱区结构建模模板研究

在采用MarkIII货物维护系统的超大型乙烷运输船（VLEC）的结构设计中,基于CATIA V6对货舱区建模模板进行研究,后续的相似船型可直接通过调用建模模板来实现快速构建货舱区结构模型,而以此建模模板为基础的结构模型可在建模后期通过修改预设的参数而进行快速变换,从而与其相关联的其他结构（如横向构件等）可自动进行更新。建模模板的研究可提高CATIA V6中结构建模的效率,也为规范结构建模策略提供参考。     

Design and Application of Micropiles on Treatment for Landslide of High-speed Railway

Research purposes: The micro-pile has been used in foundation replacement, building reinforcement, retaining soil reinforcement, but the design and calculation theory of the micro-pile is seriously lagging behind. The design and calculation method and content of the micro-pile are not clear, and there are no relevant regulations. In this paper, the design and calculation method of landslide treatment by micro-pile is discussed, and its effect is monitored and analyzed. Research conclusions: (1) There are many advantages such as flexible construction and high construction efficiency. For landslide project with limited terrain, micro-pile has good governance effect and adaptability. (2) The monitoring data show that it is appropriate to adopt micro-pile treatment in the landslide project. After the micro-pile reinforcement treatment, the deformation of the landslide project has been quickly and effectively controlled, and the safety of the tunnel and roadbed engineering has been guaranteed. (3) The design content of the micro-pile should include the overall stability, the length of the pile, the pile spacing, and the reinforcement of the pile. (4) This paper can provide guidance for the design and construction of using micro-piles to control railway landslide. © 2021, Editorial Department of Journal of Railway Engineering Society. All right reserved.     

Optimal joint distance and time toll for cordon-based congestion pricing

This paper addresses the optimal toll design problem for the cordon-based congestion pricing scheme, where both a time-toll and a nonlinear distance-toll (i.e., joint distance and time toll) are levied for each network user’s trip in a pricing cordon. The users’ route choice behaviour is assumed to follow the Logit-based stochastic user equilibrium (SUE). We first propose a link-based convex programming model for the Logit-based SUE problem with a joint distance and time toll pattern. A mathematical program with equilibrium constraints (MPEC) is developed to formulate the optimal joint distance and time toll design problem. The developed MPEC model is equivalently transformed into a semi-infinite programming (SIP) model. A global optimization method named Incremental Constraint Method (ICM) is designed for solving the SIP model. Finally, two numerical examples are used to assess the proposed methodology.     

线阵CCD油管螺纹测量系统程序开发

基于线阵CCD的油管外螺纹参数检测系统是一种先进的非接触式工业检测系统,包括硬件和软件两部分。针对该系统的重要组成部分———控制、计算程序的设计和开发进行了详细的阐述。该程序的开发基于Windows 2000,开发工具为C Builder 6.0,包括数据采集与存储、滤波、边界点选取、参数计算等多个模块。程序功能完整,界面友好,控制精确,计算结果能够满足测量系统的精度要求。