检索结果-内蒙古大学图书馆

International IEEE Conference on Intelligent Systems, IS

作者： D.A. Karras C.E. Vlitakis Y.S. Boutalis B.G. Mertzios Chalkis Institute of Technology Department Automation and Hellenic Open University Athens Greece Department Electrical and Computer Engineering Democritus University of Thrace Xanthi Greece Department of Automation Thessdoniki Institute of Technology Laboratory of Automatic Control Systems Thessaloniki Hellas and Democritus University Xanthi Greece

This study is an effort to give a practical solution in the problem of optimizing the structure of the hierarchical mixture of experts model, which is a natural extension of the associative Gaussian mixture of experts system. We present two novel methods for optimizing such structures using genetic algorithms. Special concern is taken for reducing the computational time so as to efficiently allow the structure to "grow" while it evolves with the genetic algorithm. The main contribution of the paper lies on the efficient, topologically oriented, representations of such architectures so as to be optimized through involving genetic algorithms.

关键词： Genetic algorithms Biological cells Optimization methods Neural networks Classification tree analysis automation Decision trees Expert systems Computer architecture Supervised learning

来源：评论

学校读者我要写书评

暂无评论

Unified, periodic & sampled data H/sub /spl infin// control using the delta operator

Unified, periodic & sampled data H/sub /spl infin// control ...

引用

IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden

A unified and general framework is presented for H/sub /spl infin// control of mixed continuous-time and discrete-time time-varying (periodic) systems. Using the delta operator, a close relationship is shown between the continuous- and discrete-time solutions. No assumptions are made on certain system matrices being zero or normalized, which makes the approach general and easy to apply. A combined continuous/discrete-time lifting procedure is shown to be useful, especially for ill-conditioned systems. This procedure together with the delta formalism results in a numerically robust design method concerning both short and long sampling periods for systems with W-conditioned dynamics, including widely spread eigenvalues.

关键词： control systems Sampling methods Riccati equations Automatic control Robustness Design methodology Eigenvalues and eigenfunctions Differential equations automation Laboratories

来源：评论

学校读者我要写书评

暂无评论

Optimizing simultaneously over the numerator and denominator polynomials in the Youla-Kucera parametrization

Optimizing simultaneously over the numerator and denominator...

引用

IEEE Conference on Decision and control

作者： D. Henrion V. Kucera A. Molina-Cristobal LAAS CNRS Toulouse France Institute of Information Theory and Automation Academy of Sciences of Czech Republic Prague Czech Republic Faculty of Electrical Engineering Czech Technical University Prague Czech Republic Department of Automatic Control and Systems Engineering University of Sheffield Sheffield UK

Traditionally, when approaching controller design with the Youla-Kucera parametrization of all stabilizing controllers, the denominator of the rational parameter is fixed to a given stable polynomial, and optimization is carried out over the numerator polynomial. In this work, we revisit this design technique, allowing to optimize simultaneously over the numerator and denominator polynomials. Stability of the denominator polynomial, as well as fixed-order controller design with H/sub /spl infin// performance are ensured via the notion of a central polynomial and LMI conditions for polynomial positivity.

关键词： Polynomials Design optimization Stability control systems Transfer functions Centralized control Information theory automation MIMO Linear matrix inequalities

来源：评论

学校读者我要写书评

暂无评论

Nonlinear process identification and predictive control by multiparameter models

引用

IFAC Proceedings Volumes 2004年第13期37卷 1319-1324页

作者： U. Schmitz R. Haber R. Bars Department of Plant and Chemical Process Engineering Laboratory of Process Control University of Applied Science Cologne D-50679 Koln Betzdorfer Str. 2. Germany fax: +49-22J-8275-2836 Department of Automation and Applied Injormatics Budapest University of Technology and Economics H-1111 Budapest Goldmann Gy. tér 3. Hungary fax: +36-1-463-2871

According to the multi-model approach a nonlinear dynamical process is approximated in different working points by local valid linear models. The global valid model output is calculated as the weighted sum of the sub-model outputs. The parameters of the Gaussian weighting function can be chosen by optimization. The computation time can be reduced if instead of the model outputs the parameters (for example static gain and time constant) of the local valid models are merged. The global valid nonlinear model can be used e.g., for model based predictive control. The new, multi-parameter method is illustrated by a heat exchanger example.

关键词： process identification nonlinear models multi-model predictive control heat exchanger

来源：评论

学校读者我要写书评

暂无评论

Optimizing Supervision and control for Industrial Furnaces: Predictive control Based Design

引用

IFAC Proceedings Volumes 2004年第19期37卷 17-28页

作者： Georgi M. Dimirovski A. Talha Dinibütün Miomir K. Vukobratovic J. Zhao SS Cyril and Methodius University Faculty of Electrical Engineering MK-1000 Skopje Republic of Macedonia Dogus University Computer Engineering Department Faculty of Engineering Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Turkey Institute “Mihailo Pupin” Centre of Robotics and Flexible Automation 11000 Belgrade Serbia and Montenegro Northeastern University School of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China

A systems re-engineering technique to integrated control and supervision for applications to industrial multi-zone furnaces has been elaborated by using known theories on generalized predictive control and nonlinear programming. This paper presents the derivation of optimizing equations and inequalities. The design is based on the use of general predictive control to provide optimized set-points under the presumption a well designed regulatory control was implemented at the executive level. Digital implementation of control functions are sought within standard computer process control platform for practical engineering and maintenance reasons.

关键词： Complex time-delay processes generalized predictive control integrated control and supervision optimization set-point control

来源：评论

学校读者我要写书评

暂无评论

Low order sampled data H/sub /spl infin// control using the delta operator and LMIs

Low order sampled data H/sub /spl infin// control using the ...

引用

IEEE Conference on Decision and control

作者： B. Lennartson R. Middleton A.-K. Christiansson T. McKelvey Control and Automation Laboratory Department of Signals and Systems Chalmers University of Technology Goteborg Sweden Complex Dynamic Systems & Control School of Electrical Engineering & Computer Science University of Newcastle Callaghan NSW Australia University of Trollhättan/Uddevalla Trollhattan Sweden Department of Signals and Systems Chalmers University of Technology Goteborg Sweden

A procedure for H/sub /spl infin// optimization of low order controllers for discrete-time and sampled-data systems is presented in this paper. Generally, low order H/sub /spl infin// controllers may be achieved by solving bilinear matrix inequalities (BMIs). In this paper an iterative alternation between two LMIs gives a suboptimal solution. To avoid local minima in this search the initial controller is obtained by a frequency weighted controller reduction scheme, where the closed loop properties of a full order controller is taken into account. A minimal number of parameters in the state space realization of the controller also reduces the complexity and improves numerical robustness. The complete presentation is based on delta operator models, which shows a close relationship between the continuous- and discrete-time solutions. The sensitivity of the ordinary discrete-time shift operator LMI formulation to small sampling periods is also analyzed.

关键词： control systems Linear matrix inequalities Sampling methods Automatic control Frequency Weight control Robust control Signal processing State-space methods Robustness

来源：评论

学校读者我要写书评

暂无评论

Robust H 2 Filtering for Uncertain Nonlinear Systems

引用

IFAC Proceedings Volumes 2004年第21期37卷 509-514页

作者： C.E. de Souza D.F. Coutinho K.A. Barbosa A. Trofino Department of Systems and Control Laboratório Nacional de Computação Científica - LNCC Av. Getúlio Vargas 333 25651-075 Petrópolis RJ Brazil. Department of Electrical Engineering Pontifícia Universidade Católica - RS Av. Ipiranga 6681 90619-900 Porto Alegre RS Brazil. Department of Automation and Systems Universidade Federal de Santa Catarina PO Box 476 88040-900 Florianópolis SC Brazil.

This paper addresses the design of robust H 2 filters for a class of nonlinear systems subject to uncertain parameters belonging to a given polytope. The nonlinear system is represented by differential-algebraic equations where the system matrices are allowed to be rational functions of the state and uncertain parameters. Linear matrix inequality conditions based on a parameter-dependent Lyapunov function are proposed to design a robust linear filter which ensures an optimized upper-bound on the worst-case asymptotic estimation error variance.

关键词： Robust H 2 filtering nonlinear systems uncertain systems parametric Lyapunov functions

来源：评论

学校读者我要写书评

暂无评论

Virtual sensors based on neural networks with orthogonal activation functions 2

Virtual sensors based on neural networks with orthogonal act...

引用

2nd IFAC Conference on control Systems Design, CSD 2003

作者： Jovankovic, J. Zalman, M. Department of Automation and Control Faculty of Electrical Engineering Slovak University of Technology Slovakia

The paper deals with an application of neural networks with orthogonal activation functions (OAFNN) in the sensorless field oriented control structure with induction motor (lM). The OAFNN has been trained to estimate rotor speed and has been used in the speed control structure as the speed virtual sensor. The Chebychev orthogonal polynomials of fourth order were applied as activation functions for each input (is2' U;2)' The speed structure of servo drive with IM has been realized on the dSPACE DSII02 development system with 1,lkW IM. © 2003 IFAC.

关键词： Orthogonal functions

来源：评论

学校读者我要写书评

暂无评论

Tool for remote control of mobile robots with visualization by means of virtual reality 7

Tool for remote control of mobile robots with visualization ...

引用

7th International Conference on Telecommunications, ConTEL 2003

作者： Brščić, Dražen University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation Unska 3 ZagrebHR-10000 Croatia

ISBN: (纸本)9531840520

This paper presents the current work on the development of a tool for remote control of mobile robots. The tool consists of a local controller on the robot side and a user interface for simulation and remote control that connects with the robot through the network. The user interface is implemented as an HTML page with a Java applet for remote control and communication and a virtual environment written in VRML for visualization. This way users have the ability to connect to a dedicated WWW server and download the user interface. This paper describes the concept of the tool design and the developed user interface. © 2003, Institute of electrical and Electronics Engineers Inc. All rights reserved.

关键词： Visualization

来源：评论

学校读者我要写书评

暂无评论

Identification of Wiener systems with multisegment piecewise-linear nonlinearities 2

Identification of Wiener systems with multisegment piecewise...

引用

2nd IFAC Conference on control Systems Design, CSD 2003

作者： Voros, Jozef Slovak Technical University Faculty of Electrical Engineering Department of Automation and Control Ilkovicova 3 Bratislava81219 Slovakia

The paper deals with the description of block-oriented nonlinear dynamic systems having multisegment piecewise-linear nonlinearities and with their identification using the Wiener model. A new form of multisegment nonlinearity representation and multiple application of a decomposition technique provides a special form of Wiener model with the minimum number of parameters. The model is linear in all the parameters to be estimated and is used in the proposed identification method. An illustrative example is included. © 2003 IFAC.

关键词： Nonlinear dynamical systems

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：