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A Hierarchical Optimization Algorithm Applied to Large Scale Urban Transportation systems

IFAC Proceedings Volumes 1987年第9期20卷 785-790页

作者： W. Grega Institute of Automatic Control Systems Engineering and Telecommunication Technical University of Mining and Metallurgy 30-059 Krakow Al. Mickiewicza 30/B1 Poland

This paper presents a methodology developed for determination of optimal frequencies for urban bus network. The analytical model was created to represent the system behaviour: allocation of vehicles and passenger movements. The main requirement of optimization methods for this problem is the ability to handle system of high dimensionality with non-convex objective function. The methods described in the paper exploit the specific problem structure for the reduction of an optimization problem to a sequence of related but simpler and more easily solvable optimization problems.

关键词： Decomposition hierarchical control large scale systems optimization transportation control

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Robust Schur polynomial stability and Kharitonov's theorem

Robust Schur polynomial stability and Kharitonov's theorem

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IEEE Conference on Decision and control

作者： F. J. Kraus M. Mansour B. D. O. Anderson Department of Automatic Control Industrial Engineering Swiss Federal Institute of Technology Zurich Switzerland Department of Systems Engineering Australian National University Canberra Australia

The paper considers robust stability properties for Schur polynomials of the form f(z) = Σi=0 nan-izi By plotting coefficient variations in planes defined by variable pairs ai, an-i for each i and requiring in each such plane the region of obtained coefficients to be bounded by lines of slope 45°, 90° and 135°, we show that stability for all polynomials defined by comer points is necessary and sufficient for stability of all polynomials defined by any points in the region. Using this idea, one can construct several necessity and differing sufficiency conditions for the stability of polynomials where each ai can vary independently in an interval [ai, a- i]. As the sufficiency conditions become closer to necessity conditions the number of distinct polynomials for which stability has to be tested increases.

关键词： Robust stability Polynomials Sufficient conditions Robust control automatic control Industrial engineering systems engineering and theory Testing

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USE OF ORTHOGONAL COLLOCATION APPROXIMATION FOR PARAMETER-IDENTIFICATION AND control OPTIMIZATION OF A DISTRIBUTED PARAMETER BIOLOGICAL REACTOR

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BIOTECHNOLOGY PROGRESS 1987年第4期3卷 248-258页

作者： ISAACS, S THOMA, M MUNACK, A Institut für Regelungstechnik Universität Hannover Appelstr. 11 D-3000 Hannover Federal Republic of Germany Steven Isaacs:received a Bachelor of Science degree from MIT in 1976 and a Master of Science degree from the University of California at Berkeley in 1978 both in chemical engineering. He has been employed by the IBM Corporation in San Jose California and was a member of the engineering staff at the Solar Energy Research Institute in Golden Colorado in the area of Biofuels. Since 1985 he has been employed at the Institute for Automatic Control at the University of Hannover. West Germany where he is working toward a PhD degree in the control of biological processes Axel Munack:received an electrical engineering degree in 1974 and a doctoral degree in control engineering in 1980 both from the University of Hannover. From 1974 to 1985 he was employed at the Institute for Automatic Control at the University of Hannover and since summer 1985 he has been a professor at the Technical University of Hamburg-Harburg. His main areas of scientific interest are distributed parameter systems from the theoretical side and with regard to applications modeling optimization and control of biotechnical processes Technische Universität Hamburg-Harburg Arbeitsbereich Regelungstechnik EiBendorfer Str. 38 2100 Hamburg 90 Federal Republic of West Germany Manfred Thoma:received the Dipl.-Ing. in electrical engineering and the Dr.-Ing. degree from the University of Darmstadt in 1957 and 1963 respectively. He held teaching and research positions at Darmstadt University and was a visiting professor at Purdue University Lafayette Indiana. Since 1967 he has been Professor of the Chair of Automatic Control at Hannover University. In addition he spent three months during 1977 as visiting professor at Kyoto University Japan. Professor Thoma has been with International Federation of Automatic Control since 1972 in different capacities. He is Past President of IFAC. He is a member of a number of scientific and professi

The orthogonal collocation method of approximation is applied to the differential equations describing the oxygen concentration profiles in the liquid and gas phases of the tower loop airlift reactor. This provides a relatively quick simulation method that can be used for the parameter identification and control optimization tasks of the Open Loop Feedback Optimal (OLFO) adaptive control algorithm. Results of simulated cell mass fermentations are compared to that of a slower, more accurate finite difference simulation method showing the effects of collocation order on approximation accuracy and computation time. An example of parameter identification of the spatially dependent oxygen mass transfer coefficient and the overall growth rate is provided. Also, an example is included showing the optimization of air feed rate policy over the course of a fermentation.

关键词： BIOREACTORS

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Building Models for a Specified Purpose Using System Identification

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IFAC Proceedings Volumes 1987年第12期20卷 1-5页

作者： L. Ljung Division of Automatic Control Department of Electrical Engineering Linköping University S-581 83 Linköping Sweden At present with Laboratory for Information and Decision Systems MIT Cambridge 02139 USA

Models and model quality are prime concerns for most design issues in control and systems analysis. The success of a simulation study hinges upon the reliability of the model used. In this contribution we discuss how to build mathematical models that given certain constraints, are of optimum quality for a prespecified (simulation) application. We then take into account the influence of both bias errors and random errors on the model. It turns our that for a fairly broad class of identification methods in the prediction error family, the optimal choices of design variables can be given in an explicit form.

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An efficient linear method for ARMA spectral estimation

An efficient linear method for ARMA spectral estimation

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： R. Moses P. Stoica B. Friedlander T. Soderstrom Department of Electrical Engineering Ohio State Uinversity Columbus OH USA Department of Control and Computers Polytechnic Institute of Bucharest Bucharest Romania Saxpy Computer Corporation Sunnyvale CA USA Department of Automatic Control and Systems Analysis Institute of Technology Uppsala Uppsala Sweden

A three step method for obtaining nearly maximum likelihood ARMA spectral estimates is presented. The computational complexity of the algorithm is comparable to Yule-Walker methods, but the method gives asymptotically efficient estimates. The implementation of the algorithm is discussed, and numerical examples are presented to illustrate its performance.

关键词： Parameter estimation Covariance matrix Density functional theory Equations Bandwidth Maximum likelihood estimation Statistics Polynomials

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An investigation of the intersample variance for linear stochastic control

An investigation of the intersample variance for linear stoc...

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IEEE Conference on Decision and control

作者： Bengt Lennartson Torsten Soderstrom Control Engineering Laboratory Chalmers University of Technology Gothenburg Sweden Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University Uppsala Sweden

The effects of sampled-data control on continuous-time linear stochastic systems are considered. The state covariance will vary during the sampling periods. Algorithms to compute this time-varying matrix are given. Due to this time variation an averaged value of the covariance matrix is also introduced. The intersample variance is investigated for some typical process models using different control strategies. The influences of sampling period, different types of disturbance and parameter variations are also considered.

关键词： Stochastic processes automatic control control systems Stochastic systems Servomechanisms TV

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MASTER ORDNANCE REPAIR APPLIED - STANDARD ITEM 009-67

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NAVAL ENGINEERS JOURNAL 1986年第3期98卷 35-42页

作者： STIMSON, WA MARSH, MT UTTICH, RM William A. Stimsonreceived his B.S. degree in mathematics from the University of Texas at El Paso in 1964 and his M.S. degree in engineering from the University of Santa Clara in 1971. He served in the U.S. Army Artillery during the Korean Conflict and subsequently was employed at IBM Huntsville Alabama until 1968 where he worked in the design of automatic control systems of the Saturn vehicle. From 1968 until 1971 he was employed at Ames Research Center Moffett Field in the design of nonlinear control systems for sounding rockets and pencil-shaped spacecraft. Following this Mr. Stimson worked at Hewlett Packard Sunnyvale California as a test engineer in automatic test systems. Since 1973 Mr. Stimson has been employed at the Naval Ship Weapon Systems Engineering Station Port Hueneme. He was a ship qualification trials project supervisor for many years and is now serving as master ordnance repair deputy program manager. Mr. Stimson is a member of the American Society of Naval Engineers and is program chairman of the Channel Islands Section. Cdr. Michael T. Marsh USNreceived a B.S. in mathematics from the University of Nebraska and was commissioned via the NESEP program in 1970. He holds an M.S. in computer science from the U.S. Navy Postgraduate School and an MBA from the State University of New York. Cdr. Marsh has served in the weapons department of USSFrancis Hammond (FF-1067) and of USSJohn S. McCain (DDG-36). He was weapons officer aboard USSSampson (DDG-10). As an engineering duty officer Cdr. Marsh was the technical design officer for PMS-399 at the FFG-7 Class Combat System Test Center from 1978 to 1982. He is presently combat system officer at SupShip Jacksonville and has been active in the MOR program since its inception. Cdr. Marsh is also the vice chairman of the Jacksonville Section of ASNE. LCdr. Richard M. Uttich USNholds B.S. and M.S. degrees in mechanical engineering from Stanford University. He enlisted in the Navy in 1965 serving as an electronics technician aboard USSNereus (A

The 600-ship United States Navy offers private shipyards an unprecedented opportunity for overhaul of surface combatants with complex combat systems. Recognizing the new challenge associated with the overhaul of high technology combat systems in the private sector, the Navy in 1983 established the master ordnance repair (MOR) program. This program, a joint effort of the Naval Sea systems Command (NAVSEA) and the Shipbuilders Council of America (SCA), was designed to identify and qualify those companies and private shipyards technically capable of managing combat systems work and conducting combat system testing. Standard Item 009–67 describes the role of the MOR company in combat system overhaul. It defines terms that are important to understanding the item itself, and imposes upon the prime contractor an obligation to utilize the MOR subcontractor in a managerial capacity. Specific tasks are assigned to the MOR company in planning, production, and testing. Finally, this standard item describes to the Navy planner how to estimate the size of the MOR team appropriate to the work package, a feature that will ensure that combat system bids are tailored to a specific availability.

关键词： WARSHIPS

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Fault Detection of Dynamical systems Based on a Recognition Approach to Model Discrimination

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IFAC Proceedings Volumes 1985年第5期18卷 1625-1630页

作者： K. Kumamaru S. Sagara H. Yanagida T. Söderström Department of Electrical Engineering Faculty of Engineering Kyushu University Fukuoka 812 Japan Department of Automatic Control and Systems Analysis Institute of Technology Uppsala University P.O. Box 534 Uppsala Sweden

A practical fault detection scheme based on a model discrimination approach is proposed for dynamical systems with various failure modes which can not he explicitly described by mathematical representations. Using ARX modelling, the Kullback Discrimination Information (KDI) is adopted as a model distortion measure to detect dynamics failures. In order to calculate the KDI for finite but large data sets with-out dealing with very large matrices, we derive an iterative algorithm of low dimension based on Baye' rule. The KDI is used as a detection index in a thresholding approach. This detection scheme can be combined with identification to diagnose the system operating mode. The effectiveness of the method has been confirmed through a simulation study of a second order servo system.

关键词： ARX model fault detection identification Kullback discrimination information model discrimination parameter estimation

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Some model validation criteria based on a kullback discrimination index

Some model validation criteria based on a kullback discrimin...

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IEEE Conference on Decision and control

作者： Torston Soderstrom Kousuke Kumamaru Automatic Control and Systems Analysis Group Department of Technology University of Uppsala Uppsala Sweden Department of Electrical Engineering Faculty of Engineering Kyushu University Fukuoka Japan

The Kullback discrimination index can be used to test whether two models obtained from different data sets are equal or not. Such an index can be used for model validation, which then is carried out as a crossvalidation. However, the form of the index and its implementation differ from traditional crossvalidation. Some simple validation criteria are developed from this index, and also numerically illustrated.

关键词： Data engineering automatic control automatic testing Parametric statistics Density functional theory Filters Performance evaluation Bismuth MIMO Gaussian noise

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Benefits of Feedback in Experiment Design

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IFAC Proceedings Volumes 1985年第5期18卷 909-914页

作者： M. Gevers L. Ljung Department of Systems Engineering Institute of Advanced Studies Australian National University GPO Box 4 Canberra ACT 2601 Australia Division of Automatic Control Detriment of Electrical Engineering Linköping University S-581 83 Linköping Sweden

We investigate the design of identification experiments using some recent asymptotic expressions for the variance of the estimated transfer function. In particular we highlight a number of applications for which it is...

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