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Simultaneous Fault Detection Of Heat Exchangers

IFAC Proceedings Volumes 1998年第10期31卷 365-370页

作者： Gcibor Szederkényi Erik Weyer Katalin M. Hangos Dept. of Computer Science University of Veszprem H-8201 Veszprem Egyetem u. 3. Hungary Dept. of Electrical and Electronic Engineering The University of Melbourne Parkville VIC 3052 Australia Systems and Control Research Laboratory Computer and Automation Institute HAS H-1518 Budapest PO Box 63 Hungary

A grey box model-based method for fault diagnosis is proposed in this paper. The method is based on a first principle model of the process unit: a heat exchanger, and on a grey box model of the faults: the deterioration of the heat transfer surface by aging and the leaking of the outer container. The deterioration of the heat transfer surface is due to material settling, and in old heat exchangers pieces of this material can break off and cause damage in the equipment. A recursive least squares estimator with forgetting factor is used to track both the heat transfer coefficients and the cold side volume. The heat transfer coefficients are estimated both from the hot and cold side equations. The settled material breakage fault is detected via detection of abrupt positive jumps in the estimated heat transfer coefficients using a detector based on a cumulative sum (CUSUM) test. The proposed method enables simultaneous detection of the two fault types considered. Fault localization along the equipment length is also possible when temperature measurements are available along the length.

关键词： Fault detection Fault isolation Fault location Process model Grey box modelling Identification

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Theoretical Analysis of Ziegler-Nichols Conclusions *

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IFAC Proceedings Volumes 1997年第21期30卷 195-200页

作者： Katarina Žáková Mikuláš Huba Dept. of Automation and Control Faculty of Electrical Engineering and Information Technology Slovak University of Technology Ilkovičova 3 812 19 Bratislava Slovak Republic

The paper analyses characteristics of the closed loop system with the P-, PI-, and PID-controllers and different models approximating the plant time lags. It extends some early analytical results derived by Oldenbourg and Sartorius (1951) in such a manner that they can be considered as a generalisation of the other well known classical method experimentally derived by Ziegler and Nichols (1942) and modified for discrete time systems by Takahashi at al. (1971).

关键词： PID controller continuous control digital control stability

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Grey Box Fault Detection in Heat Exchanger Networks

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IFAC Proceedings Volumes 1997年第18期30卷 191-196页

作者： E. Weyer K.M. Hangos Dept. of Chemical Engineering University of Queensland Brisbane QLD 4072 Australia Systems and Control Research Laboratory Computer and Automation Institute HAS H-1518 Budapest PO Box 63 Hungary

A grey box model-based method for fault diagnosis is proposed in this paper which is based on a first principle model of the process unit: a heat exchanger, and on a grey box model of the fault: the deterioration of the heat transfer surface by aging. Under normal operating conditions the heat transfer coefficient is constant or slowly decreasing due to a layer of settled material building up on the heat transfer surface, and we propose to use a recursive least squares estimator with forgetting factor to track the heat transfer coefficients during these stages. In old heat exchangers, big chunks of the settled material can break away from the surface causing the heat transfer coefficients to rise sharply. This fault is detected via detection of abrupt positive jump in the estimated heat transfer coefficients using a Hinkley detector

关键词： Fault diagnosis grey box modelling fault modelling identification

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Fault Detection and Diagnosis Based on Fuzzy Qualitative Reasoning

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IFAC Proceedings Volumes 1997年第18期30卷 513-518页

作者： J.M.F. Calado P.D. Roberts Control Automation and Robotics Group IDMEC - Instituto Superior Técnico Technical University of Lisbon Av. Rovisco Pais 1096 Lisboa Codex Portugal Control Engineering Research Centre Dept. of Elect. Electronic & Inf. Engineering City University Northampton Square London EC1 0HB United Kingdom

An on-line fault detection and diagnosis system, based on a fuzzy qualitative simulation algorithm, is presented. In order to test the performance and reliability of the system a computational TURBO C++ program with a hierarchical structure, has been developed. The fuzzy representation of qualitative values is more general than ordinary interval representation, since it can represent not only the information stated by a well defined real interval but also the knowledge embedded in the soft boundaries of the interval. Single and double simultaneous abrupt faults have been considered, and successful results have been obtained in simulation studies conducted with a mixing process.

关键词： Fault detection fault diagnosis qualitative simulation fuzzy sets membership functions

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Integration of control and Fault Detection: Nominal and Robust Design 1

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IFAC Proceedings Volumes 1997年第18期30卷 331-336页

作者： Henrik Niemann Jakob Stoustrup Dept. of Automation Technical University of Denmark Building 326 DK-2800 Lyngby Denmark Tlph:(+45) 45 25 35 59 Department of Control Engineering Aalborg University Fr. Bajersvej 7C DK-9220 Aalborg Denmark Tlph: (+45) 96 35 87 49

The integrated design of control and fault detection is studied. The result of the analysis is that it is possible to separate the design of the controller and the filter for fault detection in the case where the nominal model can be assumed to be fairly accurate. In the uncertain case, however, the design of the filter and the controller can not be separated when an optimal design is desired. For systems with Significant uncertainties, there turns out to be a fundamental trade-off between the performance in the control loop and the performance in the filter

关键词： Robust control Robust fault detection Separation μ -synthesis Model uncertainties

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Teaching Discrete Event control of Manufacturing Systems

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IFAC Proceedings Volumes 1997年第12期30卷 261-266页

作者： O.C. Pastravanu A. Gürel F.L. Lewis Dept. of Automatic Control and Industrial Informatics Technical University of Iasi Str. Horia 7-9 6600 Iasi Romania Dept. of Electrical and Electronic Engineering Eastern Mediterranean University P.O. Box 95 Gazi Magosa Mersin 10 Turkish Republic of Northern Cyprus Automation and Robotics Research Institute The University of Texas at Arlington 7300 Jack Newell Blvd. S Fort Worth Texas 76118-7115 USA

controller design for Flexible Manufacturing Systems (FMS) is addressed within a systems theory-basea framework, which allows the separation of the workcell (comprised of machines and resources to be controlled), and the controller (consisting of the decision-making scheduler). This point of view is particularly profitable for teaching FMS design to control engineering students, who are familiar with the feedback control principles. The design algorithm uses standard manufacturing engineering tools to produce a rule-based controller that is described mathematically in terms of matrix equations, yielding the Petri net and max/plus representations of the closed-loop FMS. This matrix approach is exploited to develop a MATLAB software which implements new functions for idempotent calculus in the semiring (R∪{-∞},max,+), and offers a large flexibility in changing the operating conditions and design specifications.

关键词： flexible manufacturing systems discrete-event systems Petri-net models max/plus models MATLAB simulation control education

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Mechatronic blockset for Simulink-concept and implementation

Mechatronic blockset for Simulink-concept and implementation

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IEEE International Symposium on Computer Aided control System Design (CACSD)

作者： O. Ravn M. Szymkat T. Uhl M. Betemps A. Pjetursson J. Rod Dept. of Autom. Tech. Univ. Lyngby Denmark Division of Control Engineering Department of Mechanical Engineering Staszic Technical University Krakow Poland Department of Automation Technical University of Denmark Lyngby Denmark

The paper describes the design considerations for modelling and simulation of mechatronic systems. The system is based on a component concept enabling the designer to pick component models that match the physical components of the setup to be modelled from a block library. Another important feature of the system is the ability to change the complexity of the simulation model in a simple, powerful and well structured way. This feature makes it simple for the designer to evaluate the influence of including different aspects of the components. The complexity can be changed both on the component level and for the whole model. This library that can be extended by the user contains standard components, such as DC-motors, potentiometers, encoders, pneumatic elements, and a Maple based facility to generate symbolic equations of motion. To evaluate the concepts the mechatronic Simulink library blockset has been implemented as a prototype based on MATLAB and Simulink and has been used to model several mechatronic systems. The library is presently being tested in different projects.

关键词： Mechatronics Mathematical model Libraries Power system modeling Robotics and automation System testing Design automation Buildings control engineering Service robots

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Ultrasonic detection in robotic environments

Ultrasonic detection in robotic environments

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IEEE International Conference on Robotics and automation (ICRA)

作者： L. Sobral R. Johansson G. Lindstedt G. Olsson Department Automatic Contlrol Lund Institute of Technology Lund Sweden Dept. of Autom. Control Lund Inst. of Technol. Sweden Department Ind. El. Engineering & Automation Lund Institute of Technology Lund Sweden

Based on information produced by a 200 kHz ultrasonic echo device developed for robotics and other industrial purposes, a method for object identification was developed and is presented in this paper. Interpretation of the echos from the reflecting objects, complexity analysis and information extraction were made by system identification methods such as impulse response analysis and state-space realization. A clustering-type discrimination of different objects based on the echo identification result was made in a subsequent step using the least-squares method. Experimental evaluation showed that the method is effective for object recognition.

关键词： Robot sensing systems Object recognition Service robots Robotics and automation Information analysis System identification Pattern analysis Shape Sensor systems Temperature

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H/sub /spl infin// vibration control of active suspension for automotive application

H/sub /spl infin// vibration control of active suspension fo...

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SICE Annual Conference

作者： A. Kanbolat Y. Okuyama F. Takemori L. Gianone S. Horvat J. Bokor Department of Information and Knowledge Engineering Facult of Engineering Tottori University Japan Tottori Daigaku Tottori JP Dept. of Inf. & Knowledge Eng. Tottori Univ. Japan Systems and Control Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences Hungary Department of Transpoi-talion Engineering Technical University of Budapest Hungary

This paper deals with simultaneous control of acceleration transmission, wheel load fluctuation, suspension deflection and sprung mass displacement. The control theory is based on the robust H/sub /spl infin// control theory with the consideration of the modeling errors lumped into an unstructured uncertainty acting on the unperturbed plant. The design method is new and powerful for electronic car suspension's control systems, as it presents a new approach to the designers for the computation of a controller maintaining robust stability while guaranteeing the performance in a wide frequency range, even in the case of the controller is applied to the actual plant. Additionally, the paper emphasizes that the assumptions in the modeling step may lead to unrealistic control designs and, as an example, the effect of the rigidity assumption on the behavior of the open loop system is discussed.

关键词： control systems control theory Open loop systems Displacement control Weight control Acceleration Wheels Fluctuations Robust control Power system modeling

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Knowledge control: One kind of advanced control technology

Knowledge control: One kind of advanced control technology

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1992 IEEE International Symposium on Industrial Electronics, ISIE 1992

作者： Zhou, F.Q. Intelligent Control Laboratory Dept. of Automation Engineering China University of Min. and Tech Xuzhou Jiangsu221008 China

ISBN: (纸本)0780300424

The development of intelligent robot, especially autonomous moving intelligent robot, makes the present control techniques to be faced with a challenge. The purpose of this paper is to present a new technique-KNOWLEDGE control. The features of the knowledge control is as follows: (1) to separate control knowledge from utilization of control knowledge, which makes knowledge control systems to be able to contain large amount of knowledge ( theoretically it can contain infinite large amount of knowledge )(2) to transform the determination of control actions to the proof of urisatisfiable of Horn clauses sets, which makes knowledge control not only can perform numerical computing but also perform symbol inference, judging, decision-making, and planning. In knowledge control, numerical computing and symbol inference are treated as the transformation from one symbol rows to another. © 1992 IEEE.

关键词： Decision making

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