检索结果-内蒙古大学图书馆

LPV Model Identification using Blended Linear Models with given Weightings

IFAC Proceedings Volumes 2009年第10期42卷 1674-1679页

作者： Yucai Zhu Guoli Ji Control Systems Faculty of Electrical Engineering Eindhoven University of Technology PO BOX513 5600MB Eindhoven the Netherlands Department of Automation Xiamen University Xiamen 361005 China Also at: Tai-Ji Control Grensheuvel 10 5685 AG Best Netherlands

Nonlinear process identification is studied. In model identification, a linear parameter varying (LPV) model is used and it consists of weighted local linear models. In this work, predetermined weighting functions are used and the LPV model identification becomes a linear identification problem with multiple weighted input data sets. So simplicity is its strength. The developed method is especially suitable for batch processes for which only transition tests are feasible and no working point tests are permitted. It is also suitable for continuous nonlinear process identification. Identifiability and stability of the LPV model are discussed. Simulation studies will be used to verify the effectiveness of the method.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Identification, Prediction and Detection of the Process Fault in a Cement Rotary Kiln by Locally Linear Neuro-Fuzzy Technique

Identification, Prediction and Detection of the Process Faul...

引用

International Conference on Computer and electrical engineering, ICCEE

作者： Masoud Sadeghian Alireza Fatehi Department of Mechatronics Engineering Sharif University of Technology International Campus Kish Island Iran Advanced Process Automation and Control (APAC) Research group Faculty of Electrical Engineering K.N. Toosi University of Technology Tehran Iran

In this paper, we use nonlinear system identification method to predict and detect process fault of a cement rotary kiln. After selecting proper inputs and output, an input-output model is identified for the plant. To identify the various operation points in the kiln, Locally Linear Neuro-Fuzzy (LLNF) model is used. This model is trained by LOLIMOT algorithm which is an incremental tree-structure algorithm. Then, by using this method, we obtained 3 distinct models for the normal and faulty situations in the kiln. One of the models is for normal condition of the kiln with 15 minutes prediction horizon. The other two models are for the two faulty situations in the kiln with 7 minutes prediction horizon are presented. At the end, we detect these faults in validation data. The data collected from White Saveh Cement Company is used for in this study.

关键词： Fault diagnosis Fault detection Kilns Production facilities electrical fault detection Fuzzy systems Delay estimation Nonlinear systems Predictive models automation

来源：评论

学校读者我要写书评

暂无评论

Identification of Nonlinear Predictor and Simulator Models of a Cement Rotary Kiln by Locally Linear Neuro-Fuzzy Technique

Identification of Nonlinear Predictor and Simulator Models o...

引用

International Conference on Computer and electrical engineering, ICCEE

作者： Masoud Sadeghian Alireza Fatehi Department of Mechatronics Engineering International Campus Sharif University of Technology Kish Island Iran Advanced Process Automation and Control (APAC) Research group Faculty of Electrical Engineering K.N. Toosi University of Technology Tehran Iran

One of the most important parts of a cement factory is the cement rotary kiln which plays a key role in quality and quantity of produced cement. In this part, the physical exertion and bilateral movement of air and materials, together with chemical reactions take place. Thus, this system has immensely complex and nonlinear dynamic equations. These equations have not worked out yet. Only in exceptional case; however, a large number of the involved parameters were crossed out and an approximation model was presented instead. This issue caused many problems for designing a cement rotary kiln controller. In this paper, we presented nonlinear predictor and simulator models for a real cement rotary kiln by using nonlinear identification technique on the Locally Linear Neuro-Fuzzy (LLNF) model. For the first time, a simulator model as well as a predictor one with a precise fifteen minute prediction horizon for a cement rotary kiln is presented. These models are trained by LOLIMOT algorithm which is an incremental tree-structure algorithm. At the end, the characteristics of these models are expressed. Furthermore, we presented the pros and cons of these models. The data collected from White Saveh Cement Company is used for modeling.

关键词： Predictive models Kilns Computational modeling Power system modeling Production facilities Nonlinear control systems Chemical technology Nonlinear equations Automatic control Process control

来源：评论

学校读者我要写书评

暂无评论

Robust Proportional-Integral control of a Laboratory Model Using Programmable Logic controller SIMATIC S7-300

引用

IFAC Proceedings Volumes 2009年第6期42卷 36-41页

作者： Radek MatuŜu Katarína Vaneková Roman Prokop Monika BakoŜová Department of Automation and Control Engineering Faculty of Applied Informatics Tomas Bata University in Zlín Nad Stránemi 4511 76005 Zlín Czech Republic Tel: +420 576 033 015 fax: +420 576 035 279 Department of Information Engineering and Process Control Faculty of Chemical and Food Technology Slovak University of Technology in Bratislava Radlinského 9 81237 Bratislava Slovakia Tel: +421 259 325 364 fax: +421 252 496 469

The main aim of the contribution is to present a possible approach to design of simple Proportional-Integral (PI) robust controllers and subsequently to demonstrate their applicability during control of a laboratory model with uncertain parameters through the Programmable Logic controller (PLC) SIMATIC S7–300 by Siemens Company. The proposed and utilized synthesis consists of two steps – the former one is a determination of controller parameters area, which ensures the robustly stable control loop and which is based on the computing/plotting the stability boundary locus while the latter one lies in the final choice of the controller itself relying on algebraic techniques. The basic theoretical parts are followed by laboratory experiments in which the 3rd order nonlinear electronic model has been successfully controlled in various working points.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Robust variance-constrained fault-tolerant control for a class of nonlinear stochastic systems

Robust variance-constrained fault-tolerant control for a cla...

引用

Asian control Conference

作者： Lifeng Ma Zidong Wang Zhi Guo Hongli Dong Bo Shen School of Automation Nanjing University of Science and Technology of PLA Nanjing China Department of Information Systems and Computing Brunei University Uxbridge Middlesex UK College of Electrical and Information Engineering Daqing Petroleum Institute Daqing China Space Control and Inertial Technology Research Center Harbin Institute of Technology Harbin China School of Information Science and Technology Donghua Uinversity Shanghai China

ISBN: (纸本)9781424454402

This paper is concerned with the variance-constrained controller design problem for a class of uncertain nonlinear stochastic systems with possible actuator faults. The stochastic nonlinearities described by statistical means are quite general that include several well-studied classes of nonlinearities as special cases. A model of actuator failures is adopted which is more practical than the traditional outage one. A linear matrix inequality (LMI) approach is proposed to solve the multiobjective fault-tolerant controller design problem, where both the exponential stability and the steady-state state variance indices are simultaneously guaranteed. Within the developed LMI framework, a sufficient condition for the solvability of the robust control problem is obtained. The explicit expression of the desired controllers is also parameterized and a single degree-of-freedom (SDOF) model is used to demonstrate the effectiveness and applicability of the proposed design approach.

关键词： Robust control Fault tolerant systems Nonlinear control systems control systems Stochastic systems Actuators Stochastic processes Linear matrix inequalities Fault tolerance Stability

来源：评论

学校读者我要写书评

暂无评论

Stability analysis approach to a class of fuzzy controlled nonlinear time-varying systems

Stability analysis approach to a class of fuzzy controlled n...

引用

Eurocon

作者： Radu-Emil Precup Marius L. Tomescu Stefan Preitl Emil M. Petriu Stefan Kilyeni Constantin Barbulescu Department of Automation and Applied informatics Polytechnic University of Timisoara Romania West University of Timisoara Timisoara Romania Polytechnic University of Timisoara Timisoara Romania School of Information Technology and Engineering University of Ottawa Canada Electrical and Power Engineering Faculty Polytechnic University of Timisoara Romania

A stability analysis approach a class of fuzzy controlled single input-single output nonlinear time-varying systems is proposed in the paper. The stability analysis is done in the sense of Lyapunov resulting in sufficient uniform asymptotic stability conditions to be used in the design of Takagi-Sugeno fuzzy logic controllers (FLCs). Use is made of quadratic positive definite Lyapunov function candidates. An illustrative example validates the stability analysis approach by the designing of the FLC to control a nonlinear plant.

关键词： Stability analysis Fuzzy control Fuzzy systems Nonlinear control systems control systems Time varying systems Asymptotic stability Takagi-Sugeno model Fuzzy logic Lyapunov method

来源：评论

学校读者我要写书评

暂无评论

LMI based design for the Acrobot walking *

引用

IFAC Proceedings Volumes 2009年第16期42卷 461-466页

作者： Milan Anderle Sergej Čelikovský Didier Henrion Jiří Zikmund Czech Technical University in Prague Faculty of Electrical Engineering Department of Control Engineering Technická 2 166 27 Prague Czech Republic Institute of Information Theory and Automation Academy of Sciences of the Czech Republic Pod vodárenskou věží 4 182 08 Prague Czech Republic LAAS-CNRS University of Toulouse 7 avenue du colonel Roche 31077 Toulouse France

Abstract This paper aims to further improve previously developed design for Acrobot walking based on partial exact feedback linearization of order 3. Namely, such an exact system transformation leads to an almost linear system where error dynamics along trajectory to be tracked is a 4-dimensional linear time-varying system having 3 time-varying entries only, the remaining entries being either zero or one. In such a way, exponentially stable tracking can be obtained by quadratically stabilizing a linear system with polytopic uncertainty. The current improvement is based on applying LMI methods to solve this problem numerically. This careful analysis significantly improves previously known approaches. Numerical simulations of Acrobot walking based on the above mentioned LMI design are demonstrated as well.

关键词： Linear matrix inequalities (LMI) underactuated mechanical systems walking robots

来源：评论

学校读者我要写书评

暂无评论

Evaluation of Liver Shape Approximation and Characterization

Evaluation of Liver Shape Approximation and Characterization

引用

International Conference on Intelligent information Hiding and Multimedia Signal Processing (IIHMSP)

作者： Farshid Babapour Mofrad Reza Aghaeizadeh Zoroofi Yen-Wei Chen Ali Abbaspour Tehrani-Fard Yoshinobu Sato Akira Furukawa Faculty of Engineering Science and Research Branch Islamic Azad University Tehran Iran Control and Intelligent Processing Center of Excellence School of Electrical and Engineering College of Engineering University of Tehran Tehran Iran College of Information and Science Ritsumeikan University Shiga Japan Electrical and Electronic Engineering School Sharif University of Technology Tehran Iran Division of Image Analysis Graduate School of Medicine Osaka University Osaka Japan Department of Radiology Shiga University of Medical Science Shiga Japan

A computational framework is presented for 3-D liver shape approximation and characterization in order to determine the accuracy of shape reconstruction via Spherical Harmonics expansion. Spherical Harmonics is a powerful mathematical tool for expanding the shape. But in medical domain, livers have very variation geometry, in shape, size, and volume. In this regards, we evaluated and optimized the Spherical Harmonics to create 3-D parametric surface of the liver from Computed Tomography (CT) imaging system which may useful for Shape modeling, surface representation, physical measurement of objects and mathematical model. We select randomly 5 livers from more 100 dataset. Mean Hausdorff distance Errors and Dice similarity coefficient DSC by liver volumes was measured. The experimental results showed that the best order of Spherical Harmonics Expansion for livers is between 12~17.

关键词： Liver Computed tomography Shape measurement Mathematical model Image reconstruction Power system harmonics Biomedical imaging Geometry Surface reconstruction Power system modeling

来源：评论

学校读者我要写书评

暂无评论

Ontology-based design pattern recognition

引用

12th International Conference on Knowledge-Based Intelligent information and engineering Systems

作者： Kirasic, Damir Basch, Danko Information Support Center University of Zagreb Faculty of Electrical Engineering and Computing Department of Control and Computer Engineering in Automation University of Zagreb Faculty of Electrical Engineering and Computing

ISBN: (纸本)9783540855620

This paper presents ontlology-based architecture for pattern recognition in the context of static source code analysis. The proposed system has three subsystems: parser, OWL ontologies and analyser. The parser subsystem translates the input coded to AST that is constructed as an XML tree. The OWL ontologies define code patterns and general programming concepts. The analyser subsystem constructs instances of the input code as ontology individuals and asks the reasoner to classify them. The experience gained in the implementation of the proposed system and some practical issues are discussed. The recognition system successfully integrates the knowledge representation field and static code analysis. resulting in greater flexibility of the recognition system.

关键词： knowledge-based system ontology-based system static code analysis description logics OWL application formal pattern definition

来源：评论

学校读者我要写书评

暂无评论

Modelling of ultrasonic motor with dead-zone based on Hammerstein model structure

引用

Journal of Zhejiang University-Science A(Applied Physics & engineering) 2008年第1期9卷 58-64页

作者： Xin-liang ZHANG Yong-hong TAN Department of Automation School of Electronic Information and Electrical Engineering Shanghai Jiao Tong University Shanghai 200030 China Laboratory of Intelligent Systems and Control Engineering Guilin University of Electronic Technology Guilin 541004 China

The ultrasonic motor (USM) possesses heavy nonlinearities which vary with driving conditions and load-dependent characteristics such as the dead-zone. In this paper, an identification method for the rotary travelling-wave type ultrasonic motor (RTWUSM) with dead-zone is proposed based on a modified Hammerstein model structure. The driving voltage contributing effect on the nonlinearities of the RTWUSM was transformed to the change of dynamic parameters against the driving voltage. The dead-zone of the RTWUSM is identified based upon the above transformation. Experiment results showed good agreement be- tween the output of the proposed model and actual measured output.

关键词： Ultrasonic motor （USM） Hammerstein model Dead-zone Nonlinearity Identification

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：