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Model-Based Diagnosis for a Gas-Liquid Separation Unit

IFAC Proceedings Volumes 1997年第18期30卷 229-234页

作者： E. Denolin D. Vrančić M. Kinnaert Đ. Juričić J. Petrovčič Department of Control Engineering Université libre de Bruxelles Avenue Franklin D. Roosevelt 50 B-1050 Brussels Belgium Department of Computer Automation and Control J. Stefan Institute Jamova 39 SI-1001 Ljubljana Slovenia

The design of a diagnostic system based on mathematical models of the plant components is performed for a gas-liquid separation unit. This design includes first modelling of the process by using physical laws governing its behaviour. Hardware redundancy and simple nonlinear observers are used to synthesise a residual generator with 7 outputs. The generalized likelihood ratio (GLR) test allows one to evaluate the residuals. Tuning of the design parameters is discussed, and a reinitialization procedure is proposed in order to distinguish between temporary and permanent changes in the mean of the residuals. Simulations are used to illustrate the choice of the design parameters

关键词： Chemical process fault detection and isolation GLR test observers

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control of multiple modular DC-to-DC power converters in conventional and dynamic sliding surfaces

Control of multiple modular DC-to-DC power converters in con...

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American control Conference (ACC)

作者： Yu.B. Shtessel O.A. Raznopolov L.A. Ozerov Department of Electrical and Computer Engineering University of Alabama Huntsville Huntsville AL USA Department of Automation and Remote Control Chelyabinsk Technical University Chelyabinsk Russia

Autonomous systems of electric power supply consisting of one common primary source of electric power supply and a set of multiple modular switched-controlled secondary sources of electric power supply (DC-to-DC power converters) are considered. The problem of the stabilization of the voltages transformed by the multiple modular switched-controlled secondary sources of electric supply is formulated and solved in conventional and dynamic local sliding surfaces. The robust decoupled linear desired behavior of the stabilization errors of the transformed voltages is guaranteed in local sliding modes. The desired quality of the voltage stabilization is achieved in dynamic sliding surfaces without measurement or estimation of disturbances (load currents).

关键词： DC-DC power converters Power supplies Sliding mode control Switching converters Voltage control Automatic control Robust control Batteries Robustness Current measurement

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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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A Laboratory for Process control Engineering Education

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IFAC Proceedings Volumes 1997年第12期30卷 283-288页

作者： Vladimir Jovan Janko Petrovčič Jozef Stefan Institute Department of Computer Automation and Control Jamova 39 1001 Ljubljana Slovenia http://www-e2.ijs.si/people/vladimir.jovan.html

At ACE'94 the concept of a process laboratory for analysis, education and research of control engineering approaches and methods was presented. Three years later we are in the middle of the work on the realisation of this laboratory, which serves a number of purposes: development and application, research, training and education in the area of industrial process control. The paper describes in detail the configuration of the process laboratory, the upgraded control system and the software tools used during our research and educational programs.

关键词： Process control conventional control computer control control system design education

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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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Process Diagnosis Using Fault-Tree Propagation Structures: The CAD Approach

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IFAC Proceedings Volumes 1997年第18期30卷 531-536页

作者： Mateja Kavčič Đani Juričić Department of Computer Automation and Control Jožef Stefan Institute Jamova 39 SI-1001 Ljubljana Slovenia Fax: +386 61 21 93 85 Tel.: +386 61 177 3 661

A component-centred approach to the derivation of the diagnostic rules for continuous processes is presented below. It strongly relies on the causal representation of fault propagation within the basic process units where the modelling convention of Hunt et al. (1993) is adopted. Basic information concerning the disturbance and fault propagation is stored in terms of the unit mini-fault tree. Additional information on special process structures is treated systematically by making use of template trees. The diagnostic rules for the entire process are obtained by chaining the mini-trees and combining the deviations caused by a fault. The paper presents some improvements concerning more efficient on-line use of the resulting rules. A major contribution concerns the realisation of the CAD environment for the prototyping of the diagnostic systems based on the process flowsheet and library of process components. Such a concept enables the re-usability of the basic process component models and the incremental development of the components library.

关键词： Fault diagnosis qualitative models mini-fault trees object-oriented programming prototyping

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Synthesized passive feedback control of sensor-rich structures

Synthesized passive feedback control of sensor-rich structur...

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American control Conference (ACC)

作者： P. Akella J.T. Wen Control Laboratory for Mechanical Structures (CLaMS) Center for Advanced Technology in Automation Robotics & Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

The passivity property of dissipative mechanical structures has long been exploited in designing passive controllers that provide robust stability even in the presence of unmodeled dynamics of the system. For an input/output map of a flexible structure to be passive, collocation of the actuators and sensors is required and also the sensors should measure the velocity of the system. The so-called smart structures frequently have more sensors than actuators. Therefore, the passive controller can at best utilize only a subset of the sensors. In this paper we consider the design of a squaring down matrix which would render a system passive subject to some additional performance considerations. The problem of obtaining the synthesized passive output is cast as a set of linear matrix inequalities (LMIs) which can be efficiently solved by the LMI Toolbox in Matlab. We apply this procedure with the assumption that the sensors provide both displacement and velocity information which is generally not true. We show that the passive controllers can be implemented without the use of velocity information. By using synthesized passive outputs in addition to naturally occurring passive outputs, we obtain better system performance. We present experimental results involving a single flexible beam with torque input and hub angular position and strain gage outputs.

关键词： Feedback control Intelligent sensors control system synthesis Mechanical sensors Sensor systems Linear matrix inequalities Mechanical factors control systems Robust stability Flexible structures

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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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A New Tuning Method for PID controllers

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IFAC Proceedings Volumes 1997年第27期30卷 399-404页

作者： D. Vrančić J. Petrovčič Y. Peng R. Hanus Department of Computer Automation and Control J. Stefan Institute Jamova 39 SI-1001 Ljubljana Slovenia FAX: +386-61-219-385 phone: +386-61-1773-732 Department of Control Engineering Free University of Brussels Av. Franklin D. Roosevelt 50 B-1050 Brussels Belgium FAX: +32-2-650-26-77 phone: +32-2-650-26-86

In this paper a new tuning approach for the PID controllers is proposed. The tuning algorithm is based on a relatively demanding magnitude optimum criterion. However, the tuning procedure is simple and only requires a process open-loop step response in order to calculate controller parameters. Additional relay excitation may be provided so as to obtain more optimal values of the PID controller parameters.

关键词： PI controllers PID controllers Self-tuning regulators Moment method Windup

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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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