智能闸门启闭监视仪设计

介绍一种以单片机为基础的卷扬式闸门启闭机载荷监控仪的研制、系统的软硬件结构和功能特性 ,着重阐述了单片机及扩展电路、人机接口和通信部分的设计思路和实现方法     

闸门启闭机智能型载荷监控仪的设计与应用

介绍一种以单片机为基础的卷扬式闸门启闭机载荷监控仪的研制,讨论了系统的软、硬件结构和功能特性,着重阐述了单片机及扩展电路、人机接口和通信部分的设计思路和实现方法。     

双闭式同机架启闭机在武定门闸加固中的设计和应用

武定门节制闸工程启闭机原为2×100kN上、下扉联动卷扬式启闭机,已运行近50年,但联动运行方式布置复杂,安全性差,启闭速度慢,启闭设备布置分散、零乱,不利于管理,设备运行维护困难,存在严重的安全隐患。根据相关标准、规范及批复,武定门节制闸启闭机必须报废更新。本文针对该启闭机启闭联动机构复杂、启闭速度慢、钢丝绳寿命短等特点,对该工程启闭机传动机构和布置形式进行了重新设计。     

基于CP1H的弧形闸门启闭机控制系统的设计

介绍了国电大峡水电站弧形泄洪闸门启闭机控制系统,将原来传统的闸门启闭机控制系统改造成以欧姆龙可编控制器CP1H为主控单元的自动控制系统,使闸门的操作更为简单,自动化程度更高,从而大大提高了工作效率和系统的可靠性.     

轴销荷载保护在螺杆式启闭机中的研究与应用

以福建省九龙江北溪水闸中干渠进水闸的螺杆式启闭机为改造对象,通过实证研究法模拟实验,研究以轴销式称重传感器为核心的轴销荷载保护在螺杆式启闭机预防顶闸事故中的保护应用,解决预防螺杆式启闭机顶闸事故的问题,完善闸门综合自动化远程集中控制,对提升水闸管理的进一步自动化、信息化、智能化具有重要的应用价值。     

基于MODBUS和TCP/IP协议的远程闸门集控系统

针对中小型水电站现有的现地站式闸门控制系统进行升级改造,实现远程闸门集控系统。将该系统部署在电站监控中心,可实现远程监测和控制水库闸门的运行。系统在保证现有系统正常工作的基础上,通过增加PLC通信模块构建工业级以太网。描述了基于TCP/IP的MODBUS协议的技术细节,并利用其与PLC通信实现闸门的远程数据采集和集中控制,同时系统将闸门运行数据和操作记录保存到数据库中备查。     

双机热备PLC控制系统在水电站闸门控制中的应用

该系统基于施奈德电气公司的Quantum系列PLC（140CPu67160）构成的双机热备架构,采用高可靠性的先进元器件组成了水电站5000kN固定卷扬式启闭机组进水口闸门自动控制系统。该控制系统的测量控制模式自动化程度高,运行可靠,功能较齐全,具备完善的自动控制和保护功能。     

双机闭式启闭机自动化监控系统设计

武定门节制闸工程启闭机已运行近50年,存在安全性差,控制方式简单,启闭及控制设备布置分散、零乱,设备运行维护困难等隐患,故对启闭机进行更新改造,重新设计自动监控系统控制保护方式。针对现代工程管理特点,将启闭方式改为双机闭式启闭,自动监控系统采用分层布置,自动监控保护主要设计为现地和远方电气控制2种形式,实现对闸门的自动化控制,保障工程运行的可靠性。     

可编程序控制器在中、小高炉卷扬系统中的应用

一、引言 高炉的卷扬系统是由料车提升机构,炉顶大、小钟和探尺控制机构组成。当炉料不到料限时,卷扬系统提升料车并按照顺序开关大、小钟,将原料送往高炉。 卷扬系统的操作比较频繁,尤其是在赶料限时,操作更加频繁。人工操作时,经常出现开关大、小钟顺序错误和由于开关大、小钟时间短造成大、小钟错位,大、小钟关不严等事故而影响高炉的正常上料。 可编程序控制器(简称PLC)是80年代迅速发展起来的新一代控制仪表。它结构简单、应用灵活、编程方便、稳定可靠、性能优越,已被广泛     

基于PLC的机械液压启闭机动力节能数值仿真

传统机械液压启闭机动力节能方法无法实现闸门的远程控制,导致机械液压启闭机动作不及时,节能效果不明显.为此引入机械系统动力学自动分析软件,仿真分析基于PLC的机械液压启闭机动力节能数值.利用PLC控制器设计机械液压启闭机,远程控制闸门的开启与关闭.以改装的启闭机为基础,通过三维建模软件Pro/Engineer构建启闭机的三维模型.在机械系统动力学自动分析软件中导入三维模型,构建启闭机动力学模型,仿真分析启闭机动力节能数值.仿真结果证明:所研究方法能够有效分析液压启闭机控制的起升机构振动力与钢丝绳收受力的动力节能数值,提升动力节能效果.     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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