一种节约组态软件点数的方法在船舶机舱监测报警系统中的应用

可编程逻辑控制器(PLC)和组态软件已经成为现代工业控制中监控系统开发的主要工具.介绍了PLC和组态软件的优缺点,以及它们结合使用的优越性,并以船舶机舱监测报警系统为例,介绍一种节约组态软件点数的编程方法.     

三级液位虚拟仿真综合实训系统平台的搭建

自控工程设计的工艺流程数量繁多,每种工艺流程的生产规模、工艺要求也不尽相同,试验室无法提供自控工程设计所需要的全部生产流程。采用构架式软件设计,应用模块式组件,搭建了一个先进、灵活的三级液位虚拟仿真综合实训平台化软件系统。用户可以对工艺流程、物料性质、设备尺寸、控制逻辑、阀门属性等进行自定义设计,从而充分满足过程控制专业课程设计和验证要求;能够进行控制逻辑设计验证和比例积分微分(PID)参数整定,经智能评分系统根据评分规则客观给出成绩,从而验证控制策略和评估控制效果。仿真平台系统采用动态仿真模型,模型内核结合工艺机理和人工智能技术开发,内部逻辑能够模拟各类工况下的系统响应,以及全流程的系统状态。仿真平台支持外接真实可编程逻辑控制器(PLC)控制系统,可进行PLC控制组态、实施等试验教学。     

电子辐照加速器控制系统的设计与实现

用分布式网络控制设计并开发了电子辐照加速器控制系统。硬件采用工业控制计算机与西门子可编程逻辑控制器PLC,PLC间采用MPI总线连接,与控制计算机采用以太网连接。计算机控制系统软件采用实验物理和工业控制系统EPICS进行模块设计,输入输出控制器IOC使用设备驱动程序实现了对可编程逻辑控制器PLC的访问,操作员接口OPI界面友好,并实现了EPICS下的数据存储系统。经现场测试与运行表明该控制系统稳定、可靠。     

西门子PLC在DC/DC动态测试中的应用

介绍了基于西门子S7-200系列可编程控制器(PLC)构成燃料电池电动汽车用DC/DC变换器动态性能试验方案,说明了控制系统的功能与原理,给出了控制系统的PLC的硬件构成图和软件编程图,并且对组态控制软件的组成做了介绍.系统运行实践表明,由于采用了PLC进行控制和文本显示器进行参数显示与设定,系统稳定可靠,界面友好,操作简单,达到测试要求.     

计算机组态控制系统在脉冲高压调制电源中的设计和应用

介绍了一种计算机组态控制系统在脉冲高压调制电源中的应用设计过程,系统采用西门子可编程控制器(PLC)[1]和工控微机(PC)对电源实现组态控制,通过组态王(KingView)[2]实现了实时监控对象和友好的人机控制界面处理.     

基于PROFIBUS现场总线的可编程逻辑控制器监控网络的实现

在分析现场总线技术的基础上，主要论述了基于PROFIBUS现场总线技术的可编程逻辑控制器(PLC)监控网络的实现及上位机用户监控程序的组态和运行。文中首先以可编程逻辑控制器及其网络的理论为基础，构建基于PROFIBUS总线的可编程逻辑控制器监控网络系统，实现了对电梯群控实验模型、挖土机模型和输料线模型等现场实验对象的控制；同时使用WinCC组态软件实现了对下位机的监测和控制，并完成了对现场数据的实时采集和处理。     

一种新型智能化测控系统的研究与实现

本文采用下位机硬件控制和上位机软件监视架构.在下位机控制系统中,通过PLC(可编程逻辑控制器)来采集与处理现场数字量信号、模拟量信号以及脉冲信号,采用RS485协议与液位仪二次表通信读取数据,实现对泵和电动阀的自动控制.在上位机监视系统中,采用Ifix组态软件开发人机界面,生产实时状况直观形象.     

PLC在温控系统中的应用

本文分析了分布式控制系统和可编程控制器(PLC)的特点,提出在温度控制系统中采用PLC,将其用于现场仪表数据的采集和处理的方法。上位机通过组态软件设计承担监督和管理任务,下位机通过PLC实现数据实时采集和控制的功能。     

基于PLC和MCGS的搬运机械手控制系统设计

针对传统的人工搬运工件存在的费时费力、不安全的问题,设计了基于MCGS组态软件的搬运机械手控制系统,并运用PLC进行可编程控制,将组态软件与控制器通过上位机连接,实现组态软件和PLC之间的实时通讯,上位机可实时显示搬运机械手的运行状态,通过设置上位机,可实现远程Web操作.该系统能够有效的提高工作效率,降低劳动强度,增加工作的安全性,实现机械手的无人值守与远程操作.     

可编程逻辑控制器在工业电气自动化的实践

在各类科技术持续发展下,工业领域与信息技术间的联系逐渐加深,可编程逻辑控制器（PLC）在工业领域得到广泛的应用,促进工业电气自动化控制水平的有效提升。基于此,文章从可编程逻辑控制器概述入手,分析工业电气自动化中（PLC）的应用,阐述可编程逻辑控制器（PLC）在工业电气自动化中的应用案例,最后,提出工业电气领域可编程逻辑控制器（PLC）未来发展方向,希望为相关人员提供参考,积极借助可编程逻辑控制器（PLC）,促进工业电气自动化快速发展。     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。     

基于AD9626的模拟信号采集存储卡设计

自然界的绝大部分信号都是以模拟的形式存在,因此模拟信号的采集转换存储在数字时代十分关键。文章讨论了在雷达信号处理领域基于AD9626的AD采集存储卡的设计原理、硬件结构和程序设计与芯片配置等问题,为今后相关领域的研究提供了可参考的方案。     

A human-computer interface for non-computer specialists

The COM teleconferencing system was designed to be easy to use for both beginners and people with much computer experience. A number of design choices in organizing the human-computer interface were considered very carefully. These design problems are not unique for teleconferencing applications, but will appear in many other developments of human-computer interfaces for non-computer specialists. This report discusses naming conventions, menu format, user commands, help facility and the treatment of ‘type ahead’ from the users.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

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.     

Call for papers Special issue on Modeling and control technologies for civil,energy,and power systems

正The control of civil,energy,and power systems presents significant new challenges for modeling and control theory.The purpose of this special issue is to provide a forum for researchers and practical engineers to discuss the recent advances in modeling and control technology development for civil,energy,and power systems.Prospective authors are invited to submit their original contributions with the focus on theory or applications of modeling,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 and promote academic exchange between Chinese and foreign scientists everywhere.