检索结果-内蒙古大学图书馆

World Congress on Intelligent control and Automation (WCICA)

作者： Zhang Fan Shang Hua Mu Chundi Lu Yuchang Department of Computer Science and Technology Tsinghua University Beijing China Qingdao Branch Naval Aeronautic Engineering College Qingdao Shandong China Department of Automatic Control Tsinghua University Beijing China

In order to improve the pointing accuracy of a small satellite, the attitude control system is controlled with pitch-axis momentum and three-axis magnetic torquerods. The satellite dynamics equation and kinematic equation are built with the method of quaternion. For each of the three body axes, well-known PD control torque equations are adopted. Three position, three rate, and a dumping control gains are optimally found by building up the optimal attitude control model. In the model, two single objectives: the minimum of the transient time and the minimum of the sum of both the square sum of the attitude angle error and the square sum of the angle rate error are integrated into the multi objectives with multiobjective optimization method. The constraints require that the attitude angle, the angle rate, the three-axis dipole moment and the pitch wheel momentum should not exceed the required value. Finally, an application to the attitude control of a small satellite is presented as an example. Results show that the optimal control algorithm is feasible, effective, and reliable, and attitude control performance is also significantly improved after optimization, compared to the traditional PD control.

关键词： Satellites Wheels Magnetic moments Equations PD control Optimal control Torque control control systems Kinematics Quaternions

来源：评论

学校读者我要写书评

暂无评论

MODEL REFERENCE PARAMETRIC ADAPTIVE ITERATIVE LEARNING control

引用

IFAC Proceedings Volumes 2002年第1期35卷 469-474页

作者： H. Yu M. Deng T.C. Yang D.H. Owens School of Engineering and Computer Science Exeter University Exeter EX4 4QF School of Engineering and Information Technology Sussex University Brighton BN1 9QT Department of Automatic Control and Systems Sheffield University Sheffield S1 3JD

Most of iterative learning control (ILC) methods requires that the relative degree of the plant is less than 2 for a linear system or the plant is passive for a non-linear system. A new model reference parametric adaptive iterative learning control using the command generator tracker (CGT) theory is proposed in this paper. The method can be applied to control a plant with a higher relative degree and it only requires to iteratively adjust n m + 2 parameters for an SISO plant. Therefore, the ILC control system is very simple. The proposed method is in the spirit of simple adaptive control which has received intensive researches during past two decades. Simulation results show the effectiveness and usefulness of the proposed method.

关键词： Iterative learning control Adaptive control Strictly positive real Model reference control

来源：评论

学校读者我要写书评

暂无评论

Optimal floating-point realizations of finite-precision digital controllers

Optimal floating-point realizations of finite-precision digi...

引用

IEEE Conference on Decision and control

作者： Jun Wu Sheng Chen J.F. Whidborne Jian Chu National Key Laboratory of Industrial Control Technology Institute of Advanced Process Control University of Zhejiang Hangzhou China Department of Electronics and Computer Science University of Southampton Southampton UK Department of Mechanical Engineering King''s College London UK

ISBN: (纸本)0780375165

The paper investigates the closed-loop stability issue of finite-precision realizations for digital controllers implemented in floating-point arithmetic. Unlike the existing methods which only address the effect of the mantissa bits in floating-point format to the sensitivity of closed-loop stability, the sensitivity of closed-loop stability is analyzed with respect to both the mantissa and exponent bits of floating-point format. A computationally tractable finite word length (FWL) closed-loop stability measure is defined, and the optimal controller realization problem is posed as searching for a floating-point realization that maximizes the proposed measure. A numerical optimization approach is adopted to solve for the resulting optimization problem. Simulation results show that the proposed design procedure yields computationally efficient controller realizations with enhanced FWL closed-loop stability performance.

关键词： Optimal control Digital control Stability Floating-point arithmetic Length measurement Design methodology Uncertainty Laboratories Industrial control Process control

来源：评论

学校读者我要写书评

暂无评论

Global optimal realizations of finite precision digital controllers

Global optimal realizations of finite precision digital cont...

引用

IEEE Conference on Decision and control

作者： Jun Wu Sheng Chen Gang Li Jian Chu National Key Laboratory of Industrial Control Technology University of Zhejiang Hangzhou China Department of Electronics and Computer Science University of Southampton Southampton UK School of Electrical and Electronic Engineering Nanyang Technological University Singapore

ISBN: (纸本)0780375165

The paper analyzes global solutions to the optimal digital controller realization problem based on maximizing a finite word length (FWL) closed-loop stability measure. For each closed-loop eigenvalue, a single-pole FWL stability function is first introduced, and a single-pole FWL stability measure is then defined as the maximum of the corresponding single-pole stability function over all the controller realizations. It is shown that the minimum of the single-pole stability measures for all the closed-loop eigenvalues is an upper bound of the optimal value for the optimal realization problem. An analytical method to compute a single-pole stability measure is developed, and an expression for all the realizations which achieve a given single-pole measure is derived. When a realization, which is a solution of the minimum single-pole measure, further satisfies the condition that the values of all its single-pole stability functions are not less than the minimum single-pole measure, the minimum single-pole measure is the optimal value of the optimal realization problem and this realization is the solution for the optimal realization problem. A computationally simple algorithm is presented.

关键词： Optimal control Digital control control systems Stability analysis Eigenvalues and eigenfunctions Uncertainty Laboratories Industrial control Industrial electronics computer science

来源：评论

学校读者我要写书评

暂无评论

An improved discrete-time robust approach for constrained model predictive control 6

An improved discrete-time robust approach for constrained mo...

引用

6th European control Conference, ECC 2001

作者： Cuzzola, Francesco A. Geromel, Jose C. Morari, Manfred Automatic Control Laboratory Swiss Federal Institute of Technology Physikstrasse 3 ZurichCH-8092 Switzerland LAC-DT School of Electrical and Computer Engineering UNICAMP C.P. 6101 Campinas SP13081-970 Brazil

ISBN: (纸本)9783952417362

In this paper we present a new technique to face the so-called constrained Model Predictive control. The main advantage of this new approach with respect to other well-known techniques is represented by the reduced conservativeness. More precisely, the technique described in this paper can be applied to polytopic uncertain systems and is based on the use of several Lyapunov functions each one corresponding to a different vertex of the uncertainty's polytope. © 2001 EUCA.

关键词： Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Comparison of different fault detection algorithms for active body control components: automotive suspension system

Comparison of different fault detection algorithms for activ...

引用

American control Conference (ACC)

作者： M. Borner M. Zele R. Isermann Institute of Automatic Control Laboratory of Control Engineering and Process Automation Darmstadt University of Technology Darmstadt Germany Department of Computer Automation and Control J. Stefan Institute Ljubljana Slovenia

Fault detection is increasingly an essential part of vehicle development. Integrating such fault detection subsystems raises the reliability, maintainability, and safety of automobile components. Until now, the suspension system was not a safety-critical component, but with the introduction of global chassis control systems this system is getting more important. Therefore, the paper presents fault detection algorithms for the suspension system. Real measurements of a vehicle are made to compare the advantages of the different fault detection algorithms.

关键词： Fault detection Automotive engineering control systems Principal component analysis Vehicle dynamics automatic control Parameter estimation Automation Automobiles Power steering

来源：评论

学校读者我要写书评

暂无评论

Raising the dead: Extending evolutionary algorithms with a case-based memory 4

引用

4th European Conference on Genetic Programming, EuroGP 2001

作者： Eggermont, Jeroen Lenaerts, Tom Poyhonen, Sanna Termier, Alexandre Leiden Institute of Advanced Computer Science Leiden University Netherlands Computational Modeling Lab Brussels Free University Belgium Control Engineering Laboratory Helsinki University of Technology Finland Laboratoire de Recherche en Informatique University of Paris XI France

ISBN: (纸本)3540418997

In dynamically changing environments, the performance of a standard evolutionary algorithm deteriorates. This is due to the fact that the population, which is considered to contain the history of the evolutionary process, does not contain enough information to allow the algorithm to react adequately to changes in the fitness landscape. There- fore, we added a simple, global case-based memory to the process to keep track of interesting historical events. Through the introduction of this memory and a storing and replacement scheme we were able to improve the reaction capabilities of an evolutionary algorithm with a periodically changing fitness function. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Evolutionary algorithms

来源：评论

学校读者我要写书评

暂无评论

An improved discrete-time robust approach for constrained model predictive control

An improved discrete-time robust approach for constrained mo...

引用

European control Conference (ECC)

作者： Francesco A. Cuzzola Jose C. Geromel Manfred Morari Automatic Control Laboratory Swiss Federal Institute of Technology Zurich Switzerland UNICAMP C.P. 6101 LAC-DT/School of Electrical and Computer Engineering Campinas SP Brazil

关键词： Robustness Predictive control State feedback Uncertain systems Cost function Lyapunov methods

来源：评论

学校读者我要写书评

暂无评论

BIFURCATION control AND NONSMOOTH FEEDBACK

BIFURCATION CONTROL AND NONSMOOTH FEEDBACK

引用

第二十届中国控制会议

作者： Hua O.Wang Yiguang Hong Laboratory for Intelligent and Nonlinear Control(LINC)Department of Electrical and Computer Engineering Duke University DurhamNC 27708U.S.A and Center for Nonlinear and Complex Systems Dept.of Control Science and Engineering Huazhong University of Science and Technology Institute of Systems Sciences Chinese Academy of Sciences

In the paper,we exhibit the usefulness of nonlinearity in two aspects:analysis of nonlinear dynamics and nonsmooth feedback *** illustrative examples are given to show how the new bifurcation p

关键词：

来源：评论

学校读者我要写书评

暂无评论

Distributed Wireless control Using Bluetooth

引用

IFAC Proceedings Volumes 2001年第22期34卷 360-365页

作者： Johan Eker Anton Cervin Andreas Hörjel Department of Electrical Engineering and Computer Science University of California at Berkeley 337 Cory Hall Berkeley CA 94720-1770 USA Department of Automatic Control Lund Institute of Technology Box 118 SE 22100 Lund Sweden ConnectBlue Stora Varvsgatan 11 N:1 SE 211 19 Malmö Sweden

Bluetooth is currently emerging as one of the most promising personal wireless network technologies. The automation industry is also showing interest in using Bluetooth for more industrial applications. However, problems with unreliable links and time delays must be explicitly addressed in any wireless control application. This paper discusses two specific problems that may occur when using Bluetooth in a control loop: long random delays and bit errors. Simple solutions to these problems are presented. The ideas have been tried out, both in simulations and in experiments, on a rotating inverted pendulum controlled over a Bluetooth network.

关键词： Bluetooth distributed control delay compensation bit-error filter

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：