检索结果-内蒙古大学图书馆

IFAC Proceedings Volumes 2003年第13期36卷 109-116页

作者： Elke Hintze Pavel Kucera Institut f. Automation und Kommunikation e. V. Magdeburg (ifak) Steinfeldstr. 3 D-39179 Barleben. Germany Brno University of Technology Faculty of Electrical Engineering and Communication Department of Control and Instrumentation Bozetechova 2 612 66 Brno Czech Republic

Driven by the demand on more flexibility in manufacturing and process automation systems. investigations are made in the field of wireless communication. In the R-FlELDBUS project a new wireless physical layer type was added to an existing fieldbus system. The resulting R-FIELDBUS systems allow adaptive architectures with mixed wired and wireless segments. To be able to analyse the functional and time behaviour of different configurations, a simulation model of the fieldbus system was also extended by the wireless behaviour. This paper describes the used simulation method. the models of the communication protocol as well as the new added wireless medium type as well as providing some first simulation results.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Parametric Lyapunov function approach to 2 analysis and control of linear parameter-dependent systems

Parametric Lyapunov function approach to 2 analysis and cont...

引用

作者： De Souza, C.E. Trofino, A. De Oliveira, J. Department of Systems and Control Lab. Nac. de Comp. Científica LNCC/MCT Av. Getúlio Vargas 333 25651-070 Petrópolis RJ Brazil Department of Automation and Systems Univ. Federal de Santa Catarina PO Box 476 88040-900 Florianópolis SC Brazil Department of Electrical Engineering Univ. do Estado de Santa Catarina 89223-100 Joinville SC Brazil

The problems of 2 analysis and control synthesis for linear continuous-time parameter-dependent systems are addressed. The admissible values of the parameters and their rates of variation are assumed to belong to a given polytope. Linear matrix inequality-based methods of 2 performance analysis and state feedback control are developed. Both the design of gain-scheduled and robust controllers are addressed. The proposed methods have the feature that stability as well as the guaranteed 2 performance cost are based on a parameter-dependent Lyapunov function which is quadratic on the system parameters. The controller implementation does not require online knowledge of the rate of variation of the parameters.

关键词： Matrix algebra

来源：评论

学校读者我要写书评

暂无评论

Composite systems control by combined math-analytical and FS/NN computing approach

引用

IFAC Proceedings Volumes 2003年第7期36卷 7-18页

作者： Georgi M. Dimirovski Yuan-Wei Jing Jun Zhao Si-Ying Zhang Dogus University Department of Computer Engineering Faculty of Engineering Acibadem Kadiköy TR-34722 Istanbul Turkey Fax# +90-216-327-9631 SS Cyril and Methodius University Institute of Automation & Systems Eng. Faculty of Electrical Engineering MK-1000 Skopje R. of Macedonia Northeastern University Institute of Control Science School of Information Science & Eng. Shenyang Liaoning P.R. of China Fax# +90-24-2389-0912

A control systems engineering approach, employing a two-level overall system architecture and different but compatible formalisms for system representation on the upper and lower levels, has been investigated in detail. One design alternative is based on employing fuzzy-system approximators and solving for the adaptive tracking of the given, arbitrary, desired system outputs. The other alternative is based on state equations of composite systems and the use of neural-network approximators to deal with uncertainties and control adaptation. In both alternatives similarity property of subsystems has been exploited. Both designs can be implemented within the standard computer process control technology, and are therefore believed to be promising in applied systems engineering.

关键词： Complex composite systems fuzzy systems neural networks nonlinear systems

来源：评论

学校读者我要写书评

暂无评论

Robust guaranteed cost filtering for a class of nonlinear systems

Robust guaranteed cost filtering for a class of nonlinear sy...

引用

International Conference on Information Fusion

作者： D.F. Coutinho K.A. Barbosa A. Trofino C.E. de Souza Department of Electrical Engineering Pont. University Católica do Rio Grande do Sul Rio Grande do Sul Brazil Department of Automation and Systems University Federal de Santa Catarina Florianopolis Santa Catarina Brazil Department of Systems and Control Laboratory Nac. Computer Cienífica-LNCC Petropolis Rio de Janeiro Brazil

ISBN: (纸本)0972184449

In this paper, we propose a deterministic approach to the robust filtering problem for a class of uncertain nonlinear systems. Based on polynomial Lyapunov functions and a relaxation technique, we derive linear matrix inequalities conditions that minimize an upper-bound on the finite horizon 2-norm of the estimation error for all admissible uncertainty and input signals (including disturbances and measurement noise). Through a simple redefinition of the Lyapunov matrix, we extended the results for the reduced-order case without considering non-convex rank constraints.

关键词： Robustness Costs Nonlinear systems State estimation Linear matrix inequalities automation Polynomials Lyapunov method Filtering theory Uncertainty

来源：评论

学校读者我要写书评

暂无评论

Model-based control of vortex shedding using low-dimensional galerkin models

Model-based control of vortex shedding using low-dimensional...

引用

33rd AIAA Fluid Dynamics Conference and Exhibit 2003

作者： Gerhard, Johannes Pastoor, Mark King, Rudibert Noack, Bernd R. Dillmann, Andreas Morzyński, Marek Tadmor, Gilead Measurement and Control Group Institute for Process and Plant Technology Technical University of Berlin P2-1 Hardenbergstraße 36a D-10623 Berlin Germany Hermann-Föttinger-lnstitute of Fluid Mechanics Technical University of Berlin HF1 Straße des 17. Juni 135 D-10623 Berlin Germany Institute of Combustion Engines and Basics of Machine Design Poznań University of Technology ul. Piotrowo 3 PL 60-965 Poznań Poland Department of Electrical and Computer Engineering Northeastern University 440 Dana Research Building Boston MA 02115 United States

ISBN: (纸本)9781624100956

A model-based flow control strategy is proposed for the suppression of vortex shedding behind a circular cylinder. The control design is based on a hierarchy of low-dimensional Galerkin models of the cylinder wake. These models are constructed from a Karhunen-Loève decomposition of a simulation without actuation. The key enablers are an additional physical mode in the Karhunen-Loève approximation and an energy-based control which respects the regime of model validity. The developed control strategy is successfully tested in direct numerical simulations. © 2003 by J. Gerhard, M. Pastoor, R. King, B.R. Noack, A. Dillmann, M. Morzyński and G. Tadmor. Published by the American Institute of Aeronautics and Astronautics, Inc.

关键词： Circular cylinders

来源：评论

学校读者我要写书评

暂无评论

On the application of multimedia in control and automation

On the application of multimedia in control and automation

引用

4th IEEE International Caracas Conference on Devices, Circuits and Systems, ICCDCS 2002

作者： Moller, R. Automation and Process Control Engineering University of Wuppertal Dept. of Electrical Engineering Germany

ISBN: (纸本)0780373804

The degree of machine automation is continuously increasing, because computer technology, control software, telecommunication technology and visualization systems are also continuously improved. This makes the use of new multimedia techniques for reading, communication and presentation of machine or process data possible, even over far distances. Multimedia communication is becoming a technology of growing importance for user interfaces in automation and process control. Think of acoustic and visual data obtained from microphones or cameras applied to a certain automated system. They can be simply used and understood as a new brand of sensors or actuators that are part of a process control unit. Supervising and monitoring of certain process states is simplified, if the operator can "see" and "hear" the real process. Technical aspects concerning types, quality and speed of multimedia data communication will be discussed and especially viewed for an implementation in automated systems. © 2002 IEEE.

关键词： automation

来源：评论

学校读者我要写书评

暂无评论

Dynamics of on-line ash monitors in monitoring and control systems

Dynamics of on-line ash monitors in monitoring and control s...

引用

作者： Cierpisz, Stanislaw Heyduk, Adam Department of Electrical Engineering and Process Control in Mining Silesian University of Technology Gliwice Poland Department of Electrical Engineering and Process Control in Mining Silesian University of Technology Gliwice 44-100 Poland

On-line ash monitors have been in use for many years in coal industry. Their operation is usually based on the scattering or the absorption of incident gamma radiation, and the derived ash value is the result of a time-averaged measurement. The natural radiation method is also used in on-line ash content measurements. A review of the ash monitors applied in Polish coal preparation plants is presented in this paper. Most of monitor installations are designed to monitor trends of ash content in coals, rather than to react to rapid changes of ash content. These data averaged over the period of tens of seconds (or several minutes) are often used by an operator to adjust the operation of a plant manually. In the case of closed loop control systems with on-line ash monitors, the dynamic properties of these instruments are important. The concept of an ash monitor with a time constant (or a time of measurement) adapting to variations of an input signal (ash content) have been analyzed. The fuzzy logic has been applied to establish the structure of the adaptive filter. Such a system allows us to speed-up the reaction of the instrument to rapid variations of ash content and at the same time to achieve better statistical accuracy over a longer period of time. This is particularly important in closed loop control systems or in splitting of a coal stream to different products. Simulation analysis of the coal blending control system applied in the "Sosnica" plant is presented in this article. Application of an on-line ash monitor with an adaptive time constant is discussed and some results of practical experiments are presented. Copyright © 2002 Taylor & Francis.

关键词： Online systems

来源：评论

学校读者我要写书评

暂无评论

Learning Premises of Fuzzy Rules for Knowledge Acquisition in Classification Problems

引用

Knowledge and Information Systems 2002年第1期4卷 96-111页

作者： Xiong, N. Litz, L. Ressom, H. Institute of Process Automation University of Kaiserslautern Kaiserslautern Germany Department of Electrical and Computer Engineering University of Maine OronoME United States

A key issue in building fuzzy classification systems is the specification of rule conditions, which determine the structure of a knowledge base. This paper presents a new approach to automatically extract classification knowledge from numerical data by means of premise learning. A genetic algorithm is employed to search for premise structure in combination with parameters of membership functions of input fuzzy sets to yield optimal conditions of classification rules. The major advantage of our work is that a parsimonious knowledge base with a low number of rules can be achieved. The practical applicability of the proposed method is examined by computer simulations on two well-known benchmark problems of Iris Data and Cancer Data classification. © 2002, Springer-Verlag London Limited.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

Mechanical design and modeling of a new mems vertical actuator

Mechanical design and modeling of a new mems vertical actuat...

引用

ASME 2002 International Design engineering Technical Conferences and Computers and Information in engineering Conference, IDETC/CIE 2002

作者： Yan, Dong Khajepour, Amir Mansour, Raafat Automation and Control Group Department of Mechanical Engineering Canada RF/Microwave Group Department of Electrical and Computer Engineering University of Waterloo Canada

This paper presents a new micro electro-thermal actuator with vertical motion. In the traditional vertical electro-thermal actuators, the arms of actuators are fabricated with different widths to provide high and low electrical resistance for the hot and cold arms. Applying electrical current to the arms results in different thermal expansion between the hot and cold arm, which forces the tip of the device to bend. The new vertical electro-thermal actuator design eliminates the parasitic electrical resistance of the cold arm through the use of a 'U' shape structure. This U-shape structure results in a bidirectional vertical actuator with larger deflection and improved electrical efficiency by providing an active return current pass. The 'U' shape actuator is more efficient in applications such as variable capacitors where larger deflection can increase the tuning range. For analysis and design purposes, an effective method to transfer the continuous system to a lumped model is presented. Simulation results are provided to show the deflection and effects of design parameters on the actuator performance. © Copyright 2002 by ASME.

关键词： Thermal expansion

来源：评论

学校读者我要写书评

暂无评论

On the application of multimedia in control and automation

On the application of multimedia in control and automation

引用

IEEE International Caracas Conference on Devices, Circuits and Systems

作者： R. Moller Automation and Process Control Engineering Department of Electrical Engineering University of Wuppertal Germany

关键词： Automatic control automation Communication system control Telecommunication control Multimedia communication process control Application software Telecommunication computing control systems Data visualization

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：