模糊自整定PID在CFBB床温控制中的应用

保定热电厂450t／h CFBB（循环流化床锅炉）的原床温控制系统采用的是常规PID控制，针对原系统响应慢、执行器动作频繁、磨损较大的问题，本文提出采用模糊自整定PID技术，该方法可将影响床温的工况参数与PID控制器参数相结合，建立模糊粗调机制．然后根据实际的系统误差及其变化率对PID控制器参数进行微调。仿真及实际运行效果表明，该方法能有效改善系统的动态品质，提高抗干扰能力，解决存在的问题，为CFBB的经济稳定运行提供参考。     

汽包水位粒子群-PID优化控制

对循环流化床锅炉汽包水位控制系统,采用串级三冲量PID控制,应用粒子群优化算法对PID控制器进行参数整定,并获得了最优参数。仿真结果表明,与传统整定方法相比,这种参数整定方案使汽包水位控制系统具有更好的控制品质,提高了系统的静动态特性。     

直流锅炉机组参数自适应模糊PID控制

针对某765MW联合循环直流锅炉-汽轮发电机组．文中给出了机组输出功率和焓值的并行模糊PID控制系统结构．研究了模糊控制器参数的自适应在线整定方法。首先．分析了联合循环直流锅炉-汽轮发电机组的数学模型,然后,在作者前期工作的基础上,给出了并行模糊PID控制器参数的自适应整定方法．最后．与基本并行模糊PID控制系统进行了仿真对比分析。仿真结果表明．本文所叙述的参数自适应模糊PID控制系统对于降低控制系统振荡,缩短调节时间等方面．其控制效果更优于基本并行模糊PID控制系统。     

循环流化床锅炉炉膛负压模糊自适应PID控制

模糊参数自适应PID控制器将模糊控制技术的原理和常规数字PID控制算法相结合,实现数字PID控制器的参数在线动态自调整。在大型循环流化床锅炉试验台上组成负压控制系统对该控制算法进行实现。运行结果表明：相对于常规PID控制器,该控制器能减少系统调节时间60％以上,减少系统最大超调量10％以上,应用于循环流化床锅炉炉膛负压控制系统中能取得良好的控制品质。     

模糊自整定PID算法在锅炉压力系统中的应用

锅炉压力是锅炉燃烧控制系统中的一个极为重要的指标，同时也是保证锅炉安全运行的主要条件之一。传统的PID控制算法因其具有原理简单，易于实现，稳态无静差等优点而被广泛的应用到该类控制系统中，但是它在实践中遇到了许多的困难（如：不适应参数变化，超调大，抗干扰性能差等）。针对这种情况，提出模糊自适应整定PID控制算法。该算法保留了传统PID算法的优点，同时引入模糊控制在线整定PID参数。将其与串级控制相结合应用到锅炉蒸汽压力控制系统中进行仿真，仿真结果表明它优于常规的PID算法，有工程应用价值。     

基于继电反馈PID参数整定的床温控制系统

对循环流化床锅炉床温控制过程进行了分析,介绍了床温过程的原始控制策略,分析了影响床温的主要因素,根据这些因素设计基于继电反馈的模型辨识及PID参数自整定的床层温度控制器,给出了在该控制器下实际动态品质及参数优化结果,证明该控制器在热工控制中具有推广的可行性。     

参数模糊自整定PID控制器在皮革收缩温度测定仪中的应用

针对皮革收缩温度测定仪的温度控制系统提出了一种参数模糊自整定PID控制方法,该方法集中了模糊控制和常规PID控制两种控制的优点.在重点介绍了模糊PID控制器的设计方法基础上,并利用MATLAB软件分别进行了参数模糊自整定PID控制系统和常规PID控制系统的仿真实验.仿真实验结果表明,参数模糊自整定PID控制方法使皮革收缩温度测定仪的温控系统的性能得到很大的改善.     

过程控制课程中一个液位控制系统综合实验磁

液位控制系统一直是过程控制工程研究的重要内容;针对过程控制实验装置,建立了实际数学模型,采用模糊理论完成了单水箱液位控制系统实验,系统采用模糊PID调节器代替传统PID ,克服了传统PID人工整定参数工作内容繁琐的缺点。将实验结果与传统数字P ID控制系统进行对比,实现了P ID参数自整定,证明了模糊P ID调节器通过参数自整定能够有效地实现液位恒定控制。     

循环流化床锅炉燃烧过程的优化控制

针对常规PID控制很难实现循环流化床锅炉燃烧自动控制的问题,介绍优化控制系统在循环流化床锅炉燃烧控制的应用．     

基于模糊自适应整定PID 的活套高度控制系统

针对板带热连轧机传统活套高度控制策略存在的问题，提出用模糊自适应整定PID的控制策略．控制器输入取活套量的偏差e和偏差变化率ec，输出取PID控制器3个参数的修正量，从而实现了PID参数的在线自整定．通过MATLAB语言，进行了传统PID控制与模糊自适应整定PID控制动态性能的仿真比较，结果表明采用模糊自适应整定PID控制可明显提高活套高度控制系统的动态性能．     

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.     

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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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