集散控制系统中控制方案实现与研究

文中应用集散控制系统分析设计了PH值控制应用系统、流量应用系统。对顺序面板功能块进行了设计分析和实现。文中综合运用了连续控制、顺序控制和运算编程等功能。编写了顺控表和运算块的程序。文中的研究对集散控制系统的设计应用具有一定的实用价值。     

集散控制系统中控制方案实现与研究

文中应用集散控制系统分析设计了PH值控制应用系统、流量应用系统.对顺序面板功能块进行了设计分析和实现.文中综合运用了连续控制、顺序控制和运算编程等功能.编写了顺控表和运算块的程序.文中的研究对集散控制系统的设计应用具有一定的实用价值.     

DCS中顺序控制功能块应用及综合设计

在集散控制系统中,控制功能的实现是依靠控制功能块正确使用和控制回路图的正确连接.文中分析研究了常用的顺序控制功能块即定时器和计数器.对连续控制中选择开关SW-33与顺序控制的综合应用进行了设计分析.编写了顺序控制表.并对集散控制系统中应用实例进行了控制方案实现和运算块程序设计.     

DCS中顺序控制功能块应用及综合设计

在集散控制系统中,控制功能的实现是依靠控制功能块正确使用和控制回路图的正确连接。文中分析研究了常用的顺序控制功能块即定时器和计数器。对连续控制中选择开关SW-33与顺序控制的综合应用进行了设计分析。编写了顺序控制表。并对集散控制系统中应用实例进行了控制方案实现和运算块程序设计。     

集散控制系统中先进控制与优化的应用

本文结合集散控制系统讨论了阶梯式广义预测控制和燃烧优化在工业锅炉控制中的应用。在集散控制系统常规控制回路基础上,进一步开发了集散控制系统的控制功能．采用先进控制与优化技术,提高了关键工艺参数的控制品质,对系统实现了操作优化。     

集散型控制系统的设计与应用 第一讲 集散型控制系统的概念及其发展

近些年来,集散型控制系统在国内外得到了迅速发展,并且已被迅速应用在各个工业领域之中。我国在“八五”期间也将积极推广应用集散型控制系统。为此,特邀请电子部六所华胜自动化总经理王常力博士撰写了“集散型控制系统的设计与应用”技术讲座。本讲座以实用为目的,比较详细地介绍了集散型控制系统的基本概念、系统结构、软硬件设计方法、应用要点等。全讲座共分十五讲。第一讲集散型控制系统的概念和发展现状第九讲DCS 的控制组态软件第二讲DCS 的现场控制级(硬件基础) 第十讲DCS 的网络体系结构第三讲DCS 的现场控制级(软件结构) 第十一讲DCS 的可靠性设计和概念第四讲DCS 的现场控制级(控制软件) 第十二讲DCS 的工程化设计与选型第五讲DCS 的现场控制级(顺序控制功能) 第十三讲DCS 的新发展和现状第六讲DCS 的操作员站功能第十四讲DCS 应用实例(一)第七讲DCS 的组态软件(数据库生成) 第十五讲DCS 应用实例(二)第八讲DCS 的组态软件(图形组态)“集散型控制系统的设计与应用”是一份难得的指导教材,本刊推出这一讲座,希望能对从事集散型控制系统工作和其它感兴趣的同志有所帮助,也希望广大读者对我们的工作提出宝贵的意见,以利本刊把技术讲座栏目办得更好。     

图书信息

过程控制装置(第二版)张永德编著本书是北京市高等教育精品教材,从过程控制装置的构成原理、结构特点、线路分析、调校使用等重点内容出发,精选素材,主要介绍模拟式仪表、数字式仪表,集散控制系统、现场总线、气动调节阀等相关内容和知识;引进CS3000集散控制系统的新内容,突出重点,强化基础,理论联系实际,力求系统性和完整性。在每章最后还针对各章内容精选大量习题和思考题,介绍了相关实验指导原则,供广大读者学习参考。本书可作为大专院校自动化专业和测控技术及仪器专业的教学用书,亦可供从事过程控制系统设计和维护的工程技术人员参考…     

集散控制系统在烧结机中的应用

本文介绍集散控制系统在结机控制中的实际应用,利用先进的ＭＩＣＲＯＴＤＣ３０００集散控制系统,对烧结机及配套设备进行控制,运行可靠。本文通过对系统的整体配置、配料控制系统、点火燃烧控制的介绍,给出了一 种集散控制系统实际应用的设计方案。     

精苯蒸馏集散控制系统

以精苯炼化过程的自动控制系统设计为背景，在采用国外先进集散控制系统的结构的基础上，针对温度控制问题，运用串级、前馈的方法有效克服了精馏塔内及塔间的耦合现象；针对进料控制问题，采用均匀控制方法有效地减弱了塔际的干扰。上述两种方法在实际应用过程中取得了较好的运行效果。结合功能先进、界面友好的应用监控软件设计，形成了一套完整的集散型控制系统。     

核电厂备用循环冷却水系统的DCS设计

根据秦山第三核电厂备用循环冷却水系统的运行特点和控制要求,对其仪控设计采用了集散控制方式,并采用浙大中控WebField ECS-100系统对控制系统进行了整体设计。     

A distributed expert control system for a hydrometallurgical zinc process

A distributed expert control system (DECSHZ) has been built for a hydrometallurgical zinc process, whose basic steps are leaching, purification and electrolysis. It consists of a central computer management system and three local expert control systems, one for each of the basic steps. This paper deals with the design and application of DECSHZ, especially its distributed architecture and main functions; expert control strategies based on rule models and a combination of rule models and steady-state mathematical models; system implementation; and the results of actual runs. DECSHZ has been found to provide not only a very pure product, but also significant economic benefits.     

Specifying and verifying requirements of real-time systems

An approach to specification of requirements and verification of design for real-time systems is presented. A system is defined by a conventional mathematical model for a dynamic system where application specific states denote functions of real time. Specifications are formulas in duration calculus, a real-time interval logic, where predicates define durations of states. Requirements define safety and functionality constraints on the system or a component. A top-level design is given by a control law: a predicate that defines an automation controlling the transition between phases of operation. Each phase maintains certain relations among the system states; this is analogous to the control functions known from conventional control theory. The top-level design is decomposed into an architecture for a distributed system with specifications for sensor, actuator, and program components. Programs control the distributed computation through synchronous events. Sensors and actuators relate events with system states. Verification is a deduction showing that a design implies requirements     

基于CAN总线分布式机场跑道灯控制系统

给出了一种基于CAN总线分布式机场跑道灯控制系统的设计方案。介绍了智能机场跑道灯控制器的硬件设计和CAN总线的硬件接口电路的设计。并对系统的整体结构、硬件配置、软件功能分别作了详细说明。实验表明，该系统具有结构简单、可靠性高、性能价格比高等特点，具有广阔的应用前景。     

Sensor-network-based robust distributed control and estimation

This paper proposes a novel distributed estimation and control method for uncertain plants. It is of application in the case of large-scale systems, where each control unit is assumed to have access only to a subset of the plant outputs, and possibly controls a restricted subset of input channels. A constrained communication topology between nodes is considered so the units can benefit from estimates of neighboring nodes to build their own estimates. The paper proposes a methodology to design a distributed control structure so that the system is asymptotically driven to equilibrium with L₂-gain disturbance rejection capabilities. A difficulty that arises is that the separation principle does not hold, as every single unit ignores the control action that other units might be applying. To overcome this, a two-stage design is proposed: firstly, the distributed controllers are obtained to robustly stabilize the plant despite the observation errors in the controlled output. At the second stage, the distributed observers are designed aiming to minimize the effects of the communication noise in the observation error. Both stages are formulated in terms of linear matrix inequalities. The performance is shown on a level-control real plant.     

Command-filter-based distributed containment control of nonlinear multi-agent systems with actuator failures

In this paper, the problem of distributed containment fault-tolerant control for a class of nonlinear multi-agent systems in strict-feedback form is studied. The considered nonlinear multi-agent systems are subject to unknown nonlinear functions and actuator faults with loss of effectiveness and lock-in-place. By resorting to the universal approximation capability of fuzzy logical systems, the command filtered backstepping technique and nonlinear fault-tolerant control theory, distributed controllers are designed recursively. From the Lyapunov stability theory, it is proved that all signals of the resulting closed-loop systems are cooperatively semi-globally uniformly ultimately bounded and the containment errors converge to a small neighbourhood of origin by properly tuning the design parameters. Finally, a numerical example is provided to show the effectiveness of the proposed control method.     

集散式多轴拧紧机控制系统的设计应用

介绍了集散式多轴拧紧机控制系统的设计原理及其在汽车工业网络制造管理中的应用.该集散式控制系统由三级控制体系和两层网络结构组成,实现了企业在螺栓拧紧部分的生产、控制和管理的集成,提高了汽车工业网络制造管理水平.     

Mobile agent-enabled framework for structuring and building distributed systems on the internet

Mobile agent has shown its promise as a powerful means to complement and enhance existing technology in various application areas. In particular, existing work has demonstrated that MA can simplify the development and improve the performance of certain classes of distributed applications, especially for those running on a wide-area, heterogeneous, and dynamic networking environment like the Internet. In our previous work, we extended the application of MA to the design of distributed control functions, which require the maintenance of logical relationship among and/or coordination of proc- essing entities in a distributed system. A novel framework is presented for structuring and building distributed systems, which use cooperating mobile agents as an aid to carry out coordination and cooperation tasks in distributed systems. The framework has been used for designing various distributed control functions such as load balancing and mutual ex- clusion in our previous work. In this paper, we use the framework to propose a novel ap- proach to detecting deadlocks in distributed system by using mobile agents, which dem- onstrates the advantage of being adaptive and flexible of mobile agents. We first describe the MAEDD (Mobile Agent Enabled Deadlock Detection) scheme, in which mobile agents are dispatched to collect and analyze deadlock information distributed across the network sites and, based on the analysis, to detect and resolve deadlocks. Then the design of an adaptive hybrid algorithm derived from the framework is presented. The algorithm can dynamically adapt itself to the changes in system state by using different deadlock detec- tion strategies. The performance of the proposed algorithm has been evaluated using simulations. The results show that the algorithm can outperform existing algorithms that use a fixed deadlock detection strategy.     

基于RBAC 和信任管理的访问控制

针对分布式环境下的访问控制问题,本文结合RBAC和信任管理的思想,提出了具有RBAC的Keynote访问控制策略和信任状;然后设计并实现了应用系统的通用访问控制平台;最后通过模拟开发应用系统验证了该平台在访问控制方面的安全性和有效性。     

铁岭污水处理厂过程监控系统设计与运行总结

该文以铁岭污水处理厂自动化控制系统为例,介绍了污水处理厂控制系统的配置和各项过程控制功能。要保证污水处理系统的可靠运转,装备一套高性能的自动化系统是必不可少的。本项目采用的集散控制系统对污水处理厂的正常生产起到至关重要的作用。     

Distributed multivariable control system design for coal-fired boilers

This paper describes the multivariable characteristics of industrial coal-fired boilers and associated mathematical models, such as combustion model, a water drum level model and a superheated steam model. The purpose of the paper is to design multivariable control systems using multivariable system frequency domain design theory and the Smith-predictor technique. A specific application shows how to design a model-based distributed multivariable control system for coal-fired boilers in a small-scale power station.