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Design of Hybrid control Systems Based on the Robust Pole Region Assignment Approach

IFAC Proceedings Volumes 1997年第21期30卷 25-30页

作者： M. Budinský Š. Kozák M. Žalman Department of Control and Automation Faculty of Electrical Engineering and Information Technology Slovak Technical University Ilkovičova 3 812 19 Bratislava Slovak Republic

The paper deals with the robust synthesis and analysis of control systems with a hybrid structure which consists of a sampled continuous process and a discrete control algorithm. A method for the design of digital controllers for processes with uncertain physical plant parameters is presented. The Robust Pole Region Assignment and the Algebraic Approach to the Output Feedback Based Pole Placement in the discrete domain are applied. The paper proposes also a new robust stability/performance criterion for hybrid systems with interval parametric uncertainties. An application example is included.

关键词： Robust control Digital control Algebraic Systems Theory Diophantine equations Robust Pole Region Assignment Approach Hybrid control Structure

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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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Dynamic Positioning of Floating Vessels Postoptimal Analysis

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IFAC Proceedings Volumes 1997年第22期30卷 183-186页

作者： S. Mandžuka Z. Vukić Control Engineering Department Brodarski institute d.o.o. Av. V. Holjevca 20 10000 Zagreb CROATIA Department of Control and Computer Engineering in Automation University of Zagreb Faculty of Electrical Engineering and Computing Unska 3 10000 Zagreb CROATIA

A procedure for the postoptimal analysis of dynamic positioning control system of floating vessels is proposed. The control system design is based on the optimal constrained covariance control (OC 3 ). Using the OC 3 technique, the disadvantages of the classical LQG optimal control technique are avoided. The presented numerical example illustrates the properties of the new approach.

关键词： Positioning system LQG control Optimization problems

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Nonlinear predictive control based on the extraction of step-response models from Takagi-Sugeno fuzzy systems

Nonlinear predictive control based on the extraction of step...

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American control Conference (ACC)

作者： M. Fischer M. Schmidt K.K. Kavsek-Biasizzo Institute of Automatic Control Laboratory of Control Systems and Process Automation Technical University of Darmstadt Darmstadt Germany Faculty of Electrical Engineering University of Ljubljana Ljubljana Slovenia

This paper deals with nonlinear predictive control based on higher order Takagi-Sugeno fuzzy systems which can also be interpreted as generalized radial basis function networks. We investigate how the fuzzy models can be linked to a special type of model based predictive control algorithm, namely the dynamic matrix control (DMC). Previously, purely linear step response models were used for long-range prediction. Here, the method is extended to nonlinear processes. Therefore, various step responses for different operating points are extracted from the fuzzy model. For performance evaluation, a heat exchanger is identified by means of the local linear model tree algorithm and controlled by the modified DMC.

关键词： Predictive control Predictive models Takagi-Sugeno model Fuzzy systems Automatic control Laboratories Radial basis function networks Fuzzy control control system synthesis Nonlinear control systems

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Fault detection filter for linear time varying systems: An algebraic-geometric approach 4

Fault detection filter for linear time varying systems: An a...

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4th European control Conference, ECC 1997

作者： Szigeti, F. Bokor, J. Edelmayer, A. Tarantino, R. Department of Control Engineering Faculty Universidad de los Andes Mérida5101 Venezuela Systems and Control Laboratory Computer and Automation Institute Hungarian Academy of Science XI Kende u. 13-17 BudapestH1111 Hungary Maraven Oil Refinery Punta Cardon Venezuela Universidad de Los Andes Mérida5101 Venezuela

ISBN: (纸本)9783952426906

In this paper we consider the fault isolation problem for the linear time varying systems. Our approach is based on characterization of the observability of LTV systems by Kalman's rank condition, which permits us to design fault detection filters, feeding also the derivatives of the inputs and the outputs. We prove, using a computable method, that the isolation problem can be solved by generalized Luenberger's observer if and only if the detectability and the weak separability of fault signatures holds.

关键词： Observability

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Analysis of deadlocks and circular waits using a matrix model for discrete event systems

Analysis of deadlocks and circular waits using a matrix mode...

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IEEE Conference on Decision and control

作者： F.L. Lewis S. Bogdan A. Gurel O. Pastravanu Automation and Robotics Research Institute University of Texas Arlington Worth TX USA Faculty of Electrical Engineering and Computer University of Zagreb Zagreb Croatia Department Automatic Control and Ind. Inf Polytechnic Institute Iasi Romania

A new matrix rule-based model of discrete-part discrete event systems is given that, together with the well-known Petri net marking transition equation, yields a complete matrix-based dynamical description of these systems. In this application to deadlock analysis, the exact relations between circular blockings and deadlocks are given for a large class of reentrant flow lines. Explicit matrix equations are given for online dynamic deadlock analysis in terms of circular blockings, and certain 'critical siphons' and 'critical subsystems'. This allows efficient dispatching with deadlock avoidance using a generalized kanban scheme. For the class of flow lines considered, the existence of matrix formulae shows that deadlock analysis is not NP-complete, but of polynomial complexity.

关键词： System recovery Discrete event systems Equations Dispatching Robotics and automation Petri nets Manufacturing Bills of materials Assembly Lifting equipment

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Developing a prototype concurrent design tool for composite topside structures

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NAVAL ENGINEERS JOURNAL 1997年第3期109卷 279-290页

作者： Dirlik, S Hambric, S Azarm, S Marquardt, M Hellman, A Bartlett, S Castelli, V Steve Dirlik:began his career at the Naval Surface Warfare Center Carderock Division in 1981 as an aerospace engineer co-op student. He completed his bachelor of science degree in aeropace and ocean engineering from Virginia Polytechnic Institute and State University in 1985 and his master of science degree in aerospace engineering from the University of Maryland in 1990. Mr. Dirlik recently completed a master of science program in applied physics at The Johns Hopins University and currently works in the Radar Cross Section and Target Physics Branch of the Signatures Directorate at the Naval Surface Warfare Center Corderoke Division. He has worked on Navy low observable programs since 1990. Stephen Hambric:is a research associate at the Applied Research Laboratory at The Pennsylvania State University. He received his B. S. and M.S. degree in mechanical engineering from Virginia Polytechnic Institute and State University and his D. Sc. in mechnical engineering from the George Washington University. He has worked on several computer aided multidiscikplinary design and optimization projects over the years including an automated propeller design system and a structural acoustic optimization capability. Dr. Shpour Azarm:is currently working as an associate professor with the Design and Manufacturing Group of the Department of Mechanical Engineering at the University of maryland at College Park. Dr Azarm's expertise is in the areas of optimization-based designed and concurrent design and optimization of multidisciplinary systems. He was a consultant at Black & Decker Corporation (summer 1996) and worked as a Navy senior summer faculty fellow (summer 1995) and a NASA summer faculty fellow (summer 1994). He was a visiting scientist at NASA Langley Research Center for Multidisciplinary Analysis and Applied Structural Optimzatiom at the University of Siegen in Germany (spring 1992) and the Design Institute of the Technical University of Denmark (summer 1990). Dr Azarm was an associate technical editor of the ASME Jour

A prototype concurrent engineering tool has been developed for the preliminary design of composite topside structures for modern navy warships. This tool, named GELS for the Concurrent engineering of Layered Structures, provides designers with an immediate assessment of the impacts of their decisions on several disciplines which are important to the performance of a modern naval topside structure, including electromagnetic interference effects (EMI), radar cross section (RCS), structural integrity, cost, and weight. Preliminary analysis modules in each of these disciplines are integrated to operate from a common set of design variables and a common materials database. Performance in each discipline and an overall fitness function for the concept are then evaluated. A graphical user interface (GUI) is used to define requirements and to display the results from the technical analysis modules. Optimization techniques, including feasible sequential quadratic programming (FSQP) and exhaustive search are used to modify the design variables to satisfy all requirements simultaneously. The development of this tool, the technical modules, and their integration are discussed noting the decisions and compromises required to develop and integrate the modules into a prototype conceptual design tool.

关键词： Warships

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Predictive gain scheduling autopilot for ships

Predictive gain scheduling autopilot for ships

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Mediterranean Electrotechnical Conference (MELECON)

作者： Z. Vukic L. Kuljaca D. Milinovic Department of Control Engineering and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

The paper presents results of research with the new predictive autopilot structure (PIP+D) with gain scheduling. The autopilot is tested and compared with conventional PID autopilot for a mariner class ship. The autopilot parameters are changed with the speed of the ship using the gain scheduling technique. Results obtained during the research show that the proposed autopilot structure is to be recommended if improved performance is of prime interest, when the velocity of the ship is changing. The analysis is based on the simulation of a mariner class ship as a nonlinear system, with the steering servo system taken as a nonlinear model. Results of the simulation are included.

关键词： Marine vehicles Limit-cycles Gears Servomechanisms System testing Spirals Mathematical model Performance gain Regulators

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A NEW TRAJECTORY REVERSING METHOD FOR THE ESTIMATION OF ASYMPTOTIC STABILITY REGIONS

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INTERNATIONAL JOURNAL OF control 1995年第4期61卷 917-932页

作者： NOLDUS, E LOCCUFIER, M University of Ghent Faculty of Applied Sciences Department of Control Engineering and Automation Technologiepark-Zwijnaarde 9 B-9052 Gent-Zwijnaarde Belgium.

A new method is presented for estimating regions of asymptotic stability for autonomous nonlinear systems. The method applies to systems that can be proven to be non-oscillatory, using a suitable Lyapunov technique. It is especially effective for second-order systems that possess several equilibrium states for which the regions of attraction must be found. The determination of the regions of asymptotic stability requires the explicit computation of a Lyapunov function and the determination by backward numerical integration of a limited number of trajectories. The obtained estimates are close approximations of the exact regions of asymptotic stability of the system's stable equilibria.

关键词： System stability

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Processor architecture model for fuzzy control

Processor architecture model for fuzzy control

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IEEE International Symposium on Intelligent control (ISIC)

作者： D. Basch M. Zagar Department of Control and Computer Engineering in Automation Faculty of Electrical Engineering and Computing University of Zagreb Zagreb Croatia

In this paper, the architecture of a fuzzy processor intended for high-speed control applications is described. Its main advantage is the inference speed that does not depend on the number of used inputs and rules. This is accomplished by the usage of content addressable memory as a rule set storage. The proposed architecture was simulated and the simulation results give the inference speed of about 200 KFLIPS.

关键词： Fuzzy control Computer architecture Process control Application software Microprocessors Fuzzy logic Fuzzy sets control engineering computing Associative memory Packaging

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