非线性系统的一种加权自适应控制方法

非线性系统的一种加权自适应控制方法１）许向阳祝和云（浙江大学工业控制研究所杭州３１００２７）关键词自适应控制，非线性系统，间隙非线性．１）国家级工业控制技术重点实验室资助课题．收稿日期１９９５－０３－０７１引言由于非线性系统的多样性，不能用统一的模型...     

带有初始误差修正的迭代学习控制

１　引言在利用迭代学习算法设计控制器时,为了保证算法的收敛性,常对系统的初态限定一定的条件,这就是所谓的初始条件问题．目前发表的文献大都要求迭代初态严格重复期望初态［１—５］．然而,实际的重复定位操作往往会引起迭代初态相对于期望初态的偏移．在很多情况下期望初态是未知的,而系统初态也是固定的．本文研究在迭代初态任意固定的情况下迭代学习控制问题,提出了带有初始误差修正的迭代学习算法,讨论了这种算法的收敛性,给出了算法的极限轨迹．２　主要结果考虑一类非线性系统ｘ（ｔ）＝ｆ（ｘ（ｔ））＋Ｂ（ｘ（ｔ））…     

基于模糊网络的非线性不确定系统的迭代学习控制

针对非线性不确定系统，为保证受控制系统的响应特性，应用模糊网络理论构建了非线性系统的模糊模型；基于模糊模型给出了模糊迭代学习控制算法．实例分析和仿真验证表明，所给算法能跟踪系统参数变化，并且能自动调整控制增益，对于系统的扰动影响具有鲁棒性，是一种行之有效的控制方案．     

迭代学习控制理论进展与挑战

迭代学习控制理论进展与挑战林辉，戴冠中（西北工业大学自动控制系·西安，７１００７２）１前言让控制器本身具有某种“智能”，使得它在控制过程中能不断地完善自己，以使控制效果越来越好．这种具有“学习”能力的控制器一直是控制工程师们追求的目标．自从ＦＵ［‘］...     

非线性工业过程控制系统的迭代学习控制与收敛性分析

基于工业过程稳态优化中递阶控制结构和线性工业过程控制系统中的迭代学习控制规律, 本文对饱和非线性工业过程控制系统和变增益非线性工业过程控制系统施行迭代学习控制, 分别给出加权PD 型闭环迭代学习控制算法和加权幂型开闭环迭代学习控制算法, 提出了期望目标轨线的 δ 可达性和迭代学习算法的ε 收敛性的概念. 利用Bellman Gronwall不等式和λ 范数理论, 论证了算法的收敛性. 数字仿真表明, 迭代学习控制能有效改善非线性工业控制系统在稳态优化时的动态品质.     

即时学习算法在非线性系统迭代学习控制中的应用

运用即时学习算法来解决一类非线性系统的迭代学习控制初值问题。对于任何类型的迭代学习控制算法，即时学习算法都能有效地估计初始控制量，减小了初始输出误差，加快了算法的收敛速度，使得经过有限次迭代后系统输出能严格跟踪理想信号。对机器人系统的仿真结果表明了该方法的有效性。     

基于模糊辨识的非线性连续系统的迭代学习控制

基于非线性连续动态的模型辨识算法，给出了非线性连续系统的一种非常有效的迭代学习控制方案。该控制方案不要求非线性连续系统中具体的非线性关系，并且容许系统初始误差的存在。     

一类退化系统目标跟踪学习控制的吸引流形方法

针对一类退化系统目标跟踪的迭代学习控制问题进行了探讨．这类系统不满足目前对迭代学习控制通常所要求的收敛性条件,从而使得学习控制方法在这类系统上的应用遇到困难．为了解决这类问题,提出了一种新的设计方案——吸引流形方法．通过构造一个相应于所给系统稳定而吸引的流形,且在构造的过程中同时设计出学习控制函数序列,以使完成对所给期望目标的跟踪．同时也讨论了这种方法的可实现问题．另外,该方法可无本质困难地应用到相应的非线性系统上．     

离散非线性系统开闭环P型迭代学习控制律及其收敛性

本文在讨论了一般开环与闭环迭代学习控制的不足后，针对一类离散非线性系统，提出了新的开闭环ＰＧ型迭代学习控制律，给出了它的收敛性证明，仿真结果表明：开闭环Ｐ型迭代律优于单纯的开环或产才环Ｐ型迭代 律。     

非线性系统的神经网络学习控制

主要控制了一类非线性系统的神经网络学习控制问题。讨论了以迭代学习方式训练的神经网络学习控制器，在满足一定条件，可以实现一定时间内的系统输出跟踪。     

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.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

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