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Grey Box Identification of Vehicle Dynamics

IFAC Proceedings Volumes 1994年第8期27卷 1187-1192页

作者： L. Gianone J. Bokor K.M. Hangos Systems and Control Laboratory Computer and Automation Research Institute HAS H-1518 Budapest P.O.B. 63 Hungary

The parametnzation and identification of vehicle vibrating structures are discussed in this paper. The determination of physical parameters from the abstract parameters that represent free coefficients in a transfer function or state space model of the vehicle is investigated for the axle subsystems. The situation when some of the coefficients are known a priori, and also there are certain dependences, possibly nonlinear, among some physical parameters is investigated. Related to this grey box problem, an identification scheme is proposed to obtain the physical parameters from the unconstrained estimates of the abstract parameters of the axle models.

关键词： Vehicles suspension system physical modeling grey box parameter estimation instrumental variable method

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Robust analysis of potential large overshoots in heat exchanger networks

Robust analysis of potential large overshoots in heat exchan...

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American control Conference (ACC)

作者： E.I. Varga J. Bokor K.M. Hangos Systems and Control Laboratory Computer and Automation Research Institute Budapest Hungary

A robust modeling method of heat exchanger networks (HENs) with structured parametric perturbations has been used in this paper which results in a model in LFT form. The LFT of the overall HEN system can be generated algorithmically from the model of the heat exchangers and from the network topology. Based on these modeling paradigms robust stability and performance tests have been applied using L/sub /spl infin// signal norms in a non-standard way to determine an upper bound for overshoots in HENs. The proposed method has been illustrated on the simple example of a countercurrent heat exchanger with bypass.

关键词： Robustness Intelligent networks Uncertainty Heat transfer Network topology Robust control Temperature measurement Space heating Automatic control control systems

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QUALITATIVE MODEL-BASED VERIFICATION OF OPERATING PROCEDURES BY HIGH-LEVEL PETRI NETS

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computerS & CHEMICAL ENGINEERING 1994年第Sup1期18卷 S565-S569页

作者： GERZSON, M CSAKI, Z HANGOS, KM Systems and Control Research Laboratory Computer and Automation Institute Hung. Acad. Sci. H-1518 Budapest P.O. Box 63 Hungary

The presence of colored tokens and time opens the possibility to combine high level Petri nets for describing operating procedures and constraint type qualitative models describing the model of the system over a wide operating range. Places can be associated to state variables and the color of the tokens can be related to the qualitative value of the variable. Are expressions correspond to qualitative model equations. A suitably modified version of the order of magnitude qualitative value representation form is used together with a scaling of each variable to have the same uniform qualitative range. Operations are performed on the interval arithmetic basis and only the result is transformed back to the uniform order of magnitude quantity space. This computation method ensures advantageous algebraic properties. Based on the above idea a novel verification method is proposed in this paper for testing operating procedures against a qualitative model of the system using a high level or colored Petri net representation of the procedure and the model together.

关键词： COLORED PETRI NETS CONSTRAINT TYPE QUALITATIVE MODEL OPERATING PROCEDURES

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A graph-theoretic approach to integrated process and control system synthesis

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IFAC Proceedings Volumes 1994年第7期27卷 61-66页

作者： K.M. Hangos F. Friedler J.B. Varga L.T. Fan Systems and Control Research Laboratory Computer and Automation Institute Hungarian Academy of Sciences H-1518 Budapest Pf. 63 Hungary Department of Systems Engineering Research Institute of Chemical Engineering Hungarian Academy of Sciences H-8201 Veszprim Pf 125 Hungary Department of Chemical Engineering Kansas State University Manhattan KS 66506 USA

A graph-theoretic method for integration of process and control system (IPCS) syntheses has been proposed in the present paper. The foundation of this integration is a well-established, graph-theoretic approach to process synthesis in conjunction with the analysis of structural controllability based on digraph-type process models. A directed bipartite graph, the CP-graph, has been introduced for unambiguous representation of an IPCS structure. The notion of CP-graph has given rise to a set of axioms for describing the combinatorially feasible and controllable structures. The maximal controllable structure of an IPCS synthesis problem has been defined as the union of combinatorially feasible and controllable IPCS structures; obviously, the optimal IPCS structure must be a substructure of this maximal controllable structure. Thus, the mathematical programming model, e.g., MINLP model, of an IPCS synthesis problem should be derived from the maximal controllable structure. The fundamental combinatorial algorithm of IPCS synthesis, i.e., algorithm CMSG, for identifying this maximal controllable structure has been formulated. The complexity of this algorithm has been proved to be polynomial on the size of the problem; its efficacy is illustrated with a relatively simple example. The resultant IPCS structures are compared with the structures synthesized without considering their control systems.

关键词： Process control control system synthesis structural controllability combinatorial mathematics synthesis methods

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Grey Dynamics of Heat Exchanger Networks

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IFAC Proceedings Volumes 1993年第2期26卷 493-498页

作者： E.I. Varga J. Bokor K.M. Hangos Systems and Control Laboratory Computer and Automation Research Institute of Hungarian Academy of Sciences H-1518 Budapest POB 63 Hungary

A robust modeling method of Heat Exchanger Networks (HENs) with structured parametric perturbations has been described in this paper which results in a LFT form. The LFT of the overall HEN system can be generated algorithmically from the model of the heat exchangers and from the network topology. Based on these modeling paradigms the effect of uncertainties represented by specific Δ block structures have been analysed by frequency domain n analysis in order to get an insight into the causes of potential large overshoot-type responses. The proposed method has been illustrated on the simple example of a countercurrent heat exchanger with by-pass.

关键词： Process models heat exchangers chemical industry modeling state space system analysis robustness dynamics of HENs parametric uncertainty modeling μ analysis

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An approach to the direct analysis of transient stability

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European Transactions on Electrical Power 1993年第3期3卷 241-248页

作者： Djukanovic, M.B. Sobajic, D.J. Pao, Y.‐H. Miodrag B. Djukanovic (1959) received his B.S. M.Sc. and Ph.D. degrees in Electrical Engineering from the University of Belgrade/Yugoslavia in 1982 1985 and 1992 respectively specializing in electric power systems. In 1984 he joined the Electrical Engineering Institute “Nikola Tesla” in Belgrade where he was working on the scientific studies in the field of power systems planning operation and control. In 1985 and 1990 he was appointed as a research scholar at the Royal Institute of Technology Stockholm and Case Western Reserve University Cleveland Ohio. His major in- terests are in the area of power system analysis steady-state and dynamic security and application of neural networks in electric power systems. (Electrical Engineering Institute “Nicola Tesla” ul. Koste Glavinica 8A YU-11000 Belgrad T +3811/2351-619 Fax + 3811/2351-823) Dejan J. Sobajic (1949) received the B.S.E.E. and the M.S.E.E. degrees from the University of Belgrade/Yugoslavia in 1972 and 1976 respectively and the Ph.D. degree from Case Western Reserve University Cleveland Ohio in 1988. At present he is with the Department of Electrical Engineering and Applied Physics Case Western Reserve University Cleveland. He is also the Engineering Manager of A1 WARE Inc. Cleveland. His current research interests include power system operation and control neuralnet systems and adaptive control. He is a member of the IEEE Task Force on Neural-Network Applications in Power Systems and of the IEEE Intelligent Controls Committee. He is the Chairman of the International Neural-Networks Society Special Interest Group on Power Engineering. (Case Western Reserve University Department of Electrial Engineering and Computer Sciences Glennan Building Ohio 44 106 USA T + 1216/421-2380 Fax +1216/368-8776) Yoh-Han Pao (1922) has been a Professor of Electrical Engineering and Computer Science at Case Westem Reserve University (CWRU) Cleveland Ohio since 1967. He has served as chairman of the University's Electrical Engineering Department

The Transient Energy Function (TEF) method has been intensely investigated over the last decade as a reliable and accurate tool for transient stability assessment of multimachine power systems. In this paper we propose the Potential Energy Boundary Surface (PEBS) based method for direct analysis of transient stability. The critical value of transient energy and the Critical Clearing Time (T_CCT) are evaluated without the need for successive calculation and memorization of the system kinetic and potential energy values along the sustained fault trajectory. The method is used for determination of output features in the training phase of the neural‐net based transient security assessment. The proposed approach is tested on the well‐known ten‐generator New England test system demonstrating the validity and accuracy of obtained results. Copyright © 1993 John Wiley & Sons, Ltd.

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Qualitative simulation in the limit

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Artificial Intelligence in Engineering 1992年第2期7卷 105-109页

作者： Hangos, K.M. Csáki, Zs. Systems and Control Laboratory Computer and Automation Institute HAS H-1518 Budapest P.O.B. 63 Hungary

Limit properties of the QSIM algorithm with respect to the spurious behaviours have been analysed in this short paper, in the case of approximating landmark sets and non-qualitative right-hand side functions. It has been shown that at least two types of spurious behaviour do not disappear in the limit. The first type corresponds to the identically constant solution and appears when the solution passes the zero location of the right-hand side function, i.e. at a critical point. The second type is a consequence of the rigid sign-based description of qualitative directions and it may appear in every multivariable case (for sets of qualitative differential equations). The commonly applied global filters do not remove the source of the problems. A mathematically correct solution would be using the extensions of the usual numerical methods for integrating ordinary differential equations operating on intervals. © 1992.

关键词： limit analysis qualitative reasoning qualitative simulation spurious behaviour

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Foundations of fixed gain estimation

Foundations of fixed gain estimation

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IEEE Conference on Decision and control

作者： L. Gerencser Systems and Control Theory Laboratory Computer and Automation Research Institute Hungarian Academy of Sciences

A few basic strong approximation results for fixed gain estimators are presented. Both off-line and on-line estimators are considered. The results are first presented for time-invariant systems. Once the appropriate t... 详细信息

关键词： Time varying systems

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The Effect of the Heat Exchanger Network Topology on the Network control Properties

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IFAC Proceedings Volumes 1992年第21期25卷 220-223页

作者： E.I. Varga K.M. Hangos Systems and Control Laboratory Research Division Computer and Automation Institute Hung. Acad. Sci H-1518 Budapest P.O. Box 63. HUNGARY

The structural control properties of heat exchanger networks has been investigated from the viewpoint of network topology. While the structural stability is independent of topology, the structural controllability and observability strongly depend on topology features, like splitting and mixing connections. The dynamics of heat exchanger superstructure has been studied by numerical simulation and qualitative prediction: overshoot and inverse responses have been observed due to splitting and mixing connections

关键词： Dynamic models Heat Exchanger Networks Structural properties Influence graphs Process control

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Performance analysis of automated manufacturing systems with blocking and deadlock

Performance analysis of automated manufacturing systems with...

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International Conference on computer Integrated Manufacturing

作者： N. Viswanadham T.L. Johnson Y. Narahari Department of Computer Science and Automation Indian Institute of Science Bangalore India GE Corporate Research & Development Control Systems Laboratory Schenectady NY USA

Petri net and Markov chain models are developed for manufacturing systems with blocking and deadlock. The authors compute the probability that the system in an absorbing (deadlocked) state, the mean time to deadlock, and the throughput before deadlock, etc., which can be used to compare the performance of various prevention and avoidance strategies. A systematic method for designing locks and interlocks for deadlock avoidance using the reachability graph of the Petri net model is presented.< >

关键词： Performance analysis Manufacturing systems System recovery Throughput Machining control systems

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