单输入最优控制系统中Q矩阵的解析解

本文通过系统的开环极点和闭环极点，给出了单输入最优控制系统中Ｑ矩阵的一种解析表达式，根据这一结果，我们不仅可以求得ＬＱ最优控制指标函数中的Ｑ矩阵，而且还可以将它作为判别ＬＱ逆问题解存在的充分条件。     

具有最小稳态误差的最优控制系统设计

稳态误差是控制系统设计中一项非常重要的性能指标，本文利用线性二次型（ＬＱ）最优控制系统设计中状态加权阵Ｑ的自由度，提出了一种具有最小稳态误差的ＬＱ最优控制系统设计方法。文中针对定义的稳态误差指标，推导其关于加权阵Q的梯度矩阵计算公式，从而将共轭梯度优化算法中非常有效的Beale算法和Armijo法则应用到设计方法中，给出了在计算机上易于实现的详细设计算法，通过实例仿真计算，验证了本设计方法的有效性，并获得了许多有意义的结果。     

关于文"LQ逆问题研究"的问题讨论

关于文“ＬＱ逆问题研究”的问题讨论傅诒辉（华中理工大学自控系武汉４３００７４）关键词ＬＱ逆问题，加权矩阵，极点配置．文［门定理２给出了连续系统ＬＱ逆问题有解的充分条件以及确定加权矩阵Ｑ和Ｒ的参数化方法．本文构造性地给出了满足文［１］定理２全部条件的参...     

最优状态反馈设计中加权矩阵新的选定方法—零点追加法

最优控制系统设计中，由于二次型评价函数和闭环系统的关系不明，往往采用试探法选取加权矩阵Ｑ及Ｒ．这种设计方法不仅使得工作量大为增加，也给控制系统现场调试带来了很大困难，本文阐述了一种新的方法－零点追加法，来选定加权矩阵Ｑ，Ｒ。     

一种欠驱动两级柔性自平衡机器人的建模及其最优控制

文章以一种欠驱动两级柔性自平衡机器人这一被控对象的控制问题作为出发点,详细阐述了其数学建模方法,讨论了其最优控制策略,并针对设计过程中出现的LQ加权矩阵Q的选取难题给出了一种解析解和证明,同时运用这一结论计算出了实际问题的加权矩阵Q,从而求得最优的状态反馈矩阵K;仿真结果表明,这样一种加权矩阵Q的求解方法是有效的,并能够在较为复杂的实际问题中获得应用。     

Butterworth最优控制的逆问题

为了认识Butterworth最优控制的本质,揭开Butterworth最优传递函数与加权矩阵Q,R的相互关系,本文研究Butterworth最优控制的逆问题.首先用Butterworth最优控制确定状态反馈增益阵K,然后给出计算加权矩阵Q的参数化公式,最后用一个例子说明这种确定加权矩阵Q,R的方法的有效性和简便性.     

多段决策优化问题的摹矩阵方法及其程序实现

解决最短路优化问题的摹矩阵方法可用于解决一类离散控制系统的最优控制问题。通过将系统控制问题转变成一个多段决策问题,则系统的最优控制问题就变成了多段决策的最短路求解问题。通过一个例子探讨了摹矩阵方法在最优控制应用中的特点,即对比动态规划方法,该方法可以同时完成最短路径和最优策略的寻找,而且易于软件实现。本文最后介绍了利用VC编写摹矩阵方法用于最优控制的一个编程实例。     

改进教与学优化算法的LQR控制器优化设计

为了快速有效地确定线性二次最优控制(linear quadratic regulator,LQR)问题中的加权矩阵Q和R,针对主动悬架LQR控制器权系数设计问题,提出一种改进的教与学优化算法进行LQR优化设计。算法对基本教与学优化算法中的"教"与"学"阶段进行了进一步的改进,同时提出一种"自我学习"策略。通过仿真实验表明,和基本教与学算法、粒子群算法、遗传算法相比,本文算法在对主动悬架LQR控制器优化时,具有收敛速度快,求解精度高和稳定性强等优势。     

基于BMI的一类不确定分段线性系统的最优控制设计

将不确定分段线性系统的最优控制问题转化成最优控制性能界的优化问题．其中性能上界的优化是以反馈增益为寻优参数的一组双线性矩阵不等式(BMI)问题，对此将遗传算法和内点法结合， 设计了一种混合算法进行求解．最后的算例表明控制律的设计及其求解算法的有效性．     

Q学习算法中网格离散化方法的收敛性分析

Ｑ学习算法是Ｗａｔｋｉｎｓ提出的求解信息不完全马尔可夫决策问题的一种强化学习方法,要用Ｑ学习算法来求解有连续状态和决策空间的随机最优控制问题,则需要先离散化问题的状态和决策空间,在本文中,我们证明了在满足一定的Ｌｉｐｓｃｈｉｔｚ连续性和有关集合为紧集的条件下,随着网格密度的增加,空间离散化后Ｑ学习算法求得的最优解依概率１收敛于原连续问题的最优解。     

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.     

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.     

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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