关于转场进路电码化的一点探讨

列车在进行本线转场和跨线转场作业时,存在电码化载频的选择问题,通过逻辑电路的“记忆”功能,合理选择并自动切换载频.     

建立公司办公平台,提高公司管理水平

天津港第五港埠有限公司办公平台集信息查询、发布、信息共享、事务处理等多种功能为一体。介绍了该办公平台的开发背景、技术特点、功能特色和开发成功的意义。     

工地加油管理信息化方案

目前工地的油料管理基本还停留在人工利用简易工具进行计量发放、计量数据采用人工直读的水平上,数据出错率高、管理漏洞大,并由此造成单机核算及成本分析数据失真。通过对普通加油机的改造而开发一种新型的加油系统,实现加油机和微机的联机数据交换,并配置相应的管理软件,达到油料管理的自动化和信息化,使油料的发放数据自动计量。发放过程、管理人员、加油对象等数据自动记录存储,数据实现自动查询和分析。     

Passenger rail in North America in the light of developments in Western Europe and Japan

Because of different geo‐demographic and economic conditions, the impact of the new passenger modes (road and air) on rail travel was much larger in North America than in Europe. In 1960s and 1970s, as the railway share of intercity traffic in North America shrunk to a negligible one or two percent, the passenger trains were abandoned by private railway companies and taken over by state organizations, which have continued to operate traditional trains and generate mounting losses. On the technology side, no attempts have been made to improve competitiveness of trains vis‐a‐vis automobiles and airplanes.

In Europe and Japan, the railways responded to the challenge by (i) upgrading the performance (speed) and comfort of traditional trains operating on existing tracks and (ii) developing trains which could, on short and intermediate range distances, compete successfully, in terms of speed and economy, with the road and air modes. The Japanese (Shinkansen trains) and French (TGV trains) experience clearly shows that trains operating on dedicated lines at average speeds of 150 to 200 km/hr provide a superior transportation service and economy on high‐traffic intercity routes of up to about 500 km length. In this paper the factors responsible for the present status of passenger rail in North America are analysed, the current policies in the U.S. and Canada are evaluated in the light of experience to date and developments abroad, and suggestions for a long‐term passenger rail policy are made. This includes examination of (i) the viability of continued subsidization of traditional train services, (ii) the viability of operation of faster trains on existing tracks, (iii) the scope for introduction of modern, fast trains on dedicated lines in high‐density, intercity corridors, (iv) the application of fast trains as access to major airports and integration of airports with fast intercity lines, and (v) the impact of energy (oil) consumption in transportation.

     

基于DDC的智能楼宇监控系统设计

文章提出了一种基于DDC的楼宇自控系统的集成方案,通过对系统软硬件设计实现了对大楼照明、新风空调等系统的设备监控,具有一定的推广意义。     

轮机自动化专业中的术语和概念——一个值得注意的问题

对目前轮机自动化专业中存在的一些专业术语表述不清的问题,以及产生这个问题的原因,谈了一些有益的见解。希望在轮机自动化教材建设中,能够较好地解决这个问题。     

电气化铁路牵引变电所综合自动化系统改造方案

电气化铁路中已运行多年,目前仍起着重要作用的传统变电所,如何通过改造实现自动化,做到可靠、高效、经济、实用,已成为目前亟待解决的问题。文章结合实际工程中牵引变电所的具体情况,提出了旧所改造的基本原则、主要设计方案等,以最终实现全所综合自动化。     

基于MATLAB下的PID控制仿真

自动化船舶的机舱设备热工参数的定值控制系统多采用P、I、D的组合控制。文中通过MATLAB软件用于直伺服电机对单位阶跃输入的PID控制进行了动态仿真，显示了不同作用组合和不同增益设置时的动态过程，为系统控制规律的选择和参数设定提供了依据。     

自动化集装箱码头控制系统的研究

根据实际集装箱码头的要求,构建轨道式港口集装箱码头物理模型。在此基础上,采用西门子S7-300系列PLC以及PROFIBUS-DP总线设计了自动化集装箱码头控制系统,并运用西门子Step7编程软件编写了控制程序,包括自动卸船程序、自动装船程序、各个机构的点动控制程序、机构复位程序、异常处理程序以及应急程序等。结果表明,该控制系统和控制程序成功地运用在模型中,并且可以移植到实际控制系统中。     

轮机自动化的发展现状及特征

介绍现代船舶轮机自动化的最新技术特征,探讨设备自动化、维修自动化和管理自动化中的PLC技术、计算机控制技术,提出在创建具有我国自主知识产权和品牌的轮机自动化过程中,要借鉴国际先进水平,充分利用国内企业和院校资源。