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

作者： J.H. Taylor D.K. Frederick C.M. Rimvall H.A. Sutherland Control Systems Laboratories GE Corporate Research and Development Center Schenectady NY USA Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

The GE multidisciplinary expert-aided analysis and design (MEAD) project, which involves the integration of several computer-aided control engineering (CACE) packages under a supervisor which coordinates the execution of these packages with a database manager, an expert system, and an advanced user interface, is discussed. The principal components are, in functional terms: a supervisor, which integrates the underlying CACE packages and coordinates all activity within the GE MEAD computer program (GMCP); an expert system shell and rule bases for expert aiding of specific procedures to relieve the user from unnecessary low-level detail; a database manager for tracking system models that evolve over time along with associated results; and a user interface that facilitates access to the CACE package capabilities by permitting the user to work in several modalities, i.e. menu/forms style, using GE MEAD commands, the core packages' native commands, or the GE MEAD macro facility. The operation of the GMCP, including the user interface, expert system, and database manager, is illustrated by examples.< >

关键词： control engineering computing control engineering Packaging User interfaces Expert systems Computer interfaces control systems Data engineering Design engineering Engineering management

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Multivariable Anti-Windup and Bumpless Transfer: A General Theory

Multivariable Anti-Windup and Bumpless Transfer: A General T...

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American control Conference (ACC)

作者： P. J. Campo M. Morari C. N. Nett Chemical Engineering California Institute of Technology Pasadena CA USA Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

A general theory is developed to address the anti-windup/bumpless transfer (AWBT) problem. Analysis results applicable to any linear time invariant system subject to plant input limitations and substitutions are presented. Quantitative performance objectives for AWBT compensation are outlined and several proposed AWBT methods are evaluated in light of these objectives. A synthesis procedure which highlights the performance trade-offs for AWBT compensation design is outlined.

关键词： Closed loop systems Actuators control systems Degradation Time invariant systems System performance Lead Output feedback Error correction Position measurement

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Minimal Complexity control Law Synthesis, Part 1: Problem Formulation and Reduction to Optimal Static Output Feedback

Minimal Complexity Control Law Synthesis, Part 1: Problem Fo...

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American control Conference (ACC)

作者： C. N. Nett D. S. Bernstein W. M. Haddad Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA Government Aerospace Systems Division Harris Corporation Melbourne FL USA Department of Mechanical and Aerospace Engineering Florida Institute of Technology Melbourne FL USA

The overall goal in this series of three papers is to make progress towards the development of a control law design methodology which supports the following paradigm: Minimize control law complexity subject to the achievement of a specified accuracy in the face of a specified level of uncertainty. We achieve this goal by developing a general theory of optimal constrained-structure dynamic output feedback compensation. By applying this theory in an iterative fashion, where here the indicated iteration occurs over the choice of the compensator dynamic-structure, the paradigm stated above can in principle be realised. In this Part 1 of this series of papers the optimal constrained-structure dynamic output feedback problem is formulated in general terms. A method for reducing optimal constrained-structure dynamic output feedback problems to optimal static output feedback problems is developed. This reduction procedure is concretely illustrated for nine special cases of the general optimal constrained-structure dynamic output feedback problem. Taken together, these nine special cases contain most cases of interest in applications. Finally, the utility of these results in applications is described in some detail. Here we consider implementation issues such as operational/physical constraints, operating-point variations, and processor throughput/memory limitations, and describe how anti-windup/bumpless transfer, gain-scheduling, and digital processor implementation can be facilitated by apriori constraining the controller dynamic-structure in an appropriate fashion. In Part 2 of this series of papers a general theory of optimal static output feedback compensation is developed.

关键词： Optimal control Output feedback control systems Constraint theory Riccati equations Uncertainty Hydrogen Robust control Lighting control Design methodology

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Minimal complexity control law synthesis, part 2: problem solution via H2/H∞ optimal static output feedback

Minimal complexity control law synthesis, part 2: problem so...

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American control Conference (ACC)

作者： D.S. Bernstein W.M. Haddad C.N. Nett Government Aerospace Systems Division Harris Corporation Melbourne FL USA Department of Mechanical and Aerospace Engineering Florida Institute of Technology Melbourne FL USA Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

In part 1 of this two-part paper [1] it was shown that a large class of fixed-structure control laws can be recast as static output feedback controllers for a suitably modified plant. Accordingly, we develop here a comprehensive theory for designing static output feedback controllers. Our results go beyond earlier work by addressing both H 2 and H ∞ performance criteria and by accounting fully for all of the singularities in the problem formulation. The results are applied to the fixed-order problem (FoP) [1] to obtain a major unification of prior results, namely: the Bernstein-Haddad H 2 /H ∞ fixed-order dynamic compensator theory, the Glover-Doyle full-order H ∞ dynamic compensator theory, the Hyland-Bernstein H 2 fixed-order dynamic compensator (optimal projection) theory, and the classical LQG theory.

关键词： Output feedback Helium Hydrogen Optimal control Equations Intersymbol interference Weight control control theory Estimation theory

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H∞ identification of stable LSI systems: a scheme with direct application to controller design

H∞ identification of stable LSI systems: a scheme with dire...

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American control Conference (ACC)

作者： A. J. Helmicki C. A. Jacobson C. N. Nett Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Department of Electrical and Computer Engineering Northeastern University Boston MA USA Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

In this paper several techniques are given for the identification of stable LSI discrete time systems from input-output data. Explicit H ∞ norm error bounds are given and convergence in the noise free and the uniformly bounded deterministic noise case are established. The assumptions made on the unknown system are minimal and are limited throughout the paper to a lower bound on the decay rate of the unknown system and an upper bound on the gain of the unknown system. Given this information an experiment and a construction are specified: the experiment involves obtaining a specified number of frequency measurements of the unknown systems at a set of specified frequencies; the construction uses this experimental data to generate an identified model with prescribed H ∞ norm error tolerance to the unknown system. The resulting model identification process is highly efficient from a computational point of view.

关键词： Large scale integration control systems control system synthesis Robust control research and development Jacobian matrices Error correction Convergence Frequency Taylor series

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Practical Considerations in the Use of Distributed Parameter systems in Modeling: A control Point of View

Practical Considerations in the Use of Distributed Parameter...

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American control Conference (ACC)

作者： A. J. Helmicki C. A. Jacobson C. N. Nett Department of Electrical Computer and Systems Engineering Raneselaer Poytechiic Institute Troy NY USA Department of Electrical and Computer Engineering Northeastern University Boston MA USA Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

This paper is a condensed version of recent work [17] wherein several fundamental practical concerns pertaining to the use of linear, time-invariant, distributed parameter systems as models of physical processes are investigated. In particular, it is argued here that certain common distributed parameter systems exhibit properties which make them unsuitable for use as plant models in the design of feedback compensation. Classes of distributed parameter systems exhibiting these properties are defined and are said to be ill-posed for use in feedback compensator design. The structure of these classes is investigated within an extremely general mathematical framework which imposes no a priori restrictions on the class of distributed parameter systems under consideration. Within this framework necessary and sufficient conditions are given which completely characterise the classes of ill-posed models and establish their equivalence. These conditions are concretely illustrated by way of applications to several well-known flexible structure models. Surprisingly, several of these models are determined to be ill-posed for use in feedback compensator design.

关键词： Distributed parameter systems Feedback control systems Integral equations Distributed computing control system synthesis Jacobian matrices Flexible structures Frequency Linearity

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Robust Observer Design with Application to Fault Detection

Robust Observer Design with Application to Fault Detection

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American control Conference (ACC)

作者： N. Viswanadham K. Dean Minto Department of Computer Science and Automation Indian Institute of Science Bangalore India Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

A new scheme for robust estimation of the partial state of linear time-invariant multivariable systems is presented, and it is shown how this may be used for the detection of sensor faults in such systems. We consider an observer to be robust if it generates a faithful estimate of the plant state in the face of modelling uncertainty or plant perturbations. Using the Stable Factorization approach we formulate the problem of optimal robust observer design by minimizing an appropriate norm on the estimation error. A logical candidate is the 2-norm, corresponding to an H ∞ optimization problem, for which solutions are readily available. In the special case of a stable plant, the optimal fault diagnosis scheme reduces to an internal model control architecture.

关键词： Robustness Fault detection Observers State estimation MIMO Sensor systems Face detection Uncertainty Estimation error Fault diagnosis

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Fault detection and diagnosis of automated manufacturing systems

Fault detection and diagnosis of automated manufacturing sys...

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IEEE Conference on Decision and control

作者： N. Viswanadham T.L. Johnson Department of Computer Science & Automation Indian Institute of Science Bangalore India Systems Architectures Control Technology Bra General Electric Research and Development Center Schenectady NY USA

The authors develop a controller methodology for fault detection and diagnosis using Petri nets and fault trees in automated manufacturing systems. The controller has two levels. At the first level there are dedicated diagnostic systems for each of the subsystems, such as machine centers, robots, conveyers, etc. At the second level there is an intelligent controller monitoring the part flow and coordinating the local diagnostic systems and controllers. The authors assume that local controller and diagnostic systems exist for subsystem-level fault detection and diagnosis, and they present a Petri-net-based intelligent controller for system-level fault detection and diagnosis. The authors also describe fault-free-based diagnostics.< >

关键词： Fault detection Fault diagnosis Manufacturing systems control systems Automatic control Intelligent robots Machine intelligence Petri nets Fault trees Robot kinematics

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HISTORY OF COAST-GUARD SURFACE EFFECT SHIP PERFORMANCE IMPROVEMENTS

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NAVAL ENGINEERS JOURNAL 1988年第3期100卷 237-250页

作者： LARIMER, G MCCOLLUM, J SCHAUB, B VANLIEW, D WHIPPLE, C Gary Larimer:received his B.S. (1974) and M.S. (1975) degrees in naval architecture and marine engineering from the University of Michigan. He has worked with the Bechtel Professional Corporation the David Taylor Naval Ship Research and Development Center and the United States Coast Guard. He is a member of SNAME ASNE ABYC and IMTI. He is the author of “Reaction Fin Applications In Marine Propulsion” which documented the use of asymmetric pre-swirl vanes to increase propulsion efficiency aboard a 41-ft Coast Guard utility boat. It was presented on 5 March 1987 at the Hampton Roads section of SNAME and was nominated for the section paper of the year award. CWO3 Joe Bobby McCollum USCG: iscurrently engineering officer of the Surface Effect Ship Division Seventh Coast Guard District Key West Florida. Prior to this assignment he was assistant engineering officer on the USCGCUte.His other duty tours included engineering assignments on theCape Currenta 95-foot patrol boat on the USCGCUnimak a 311-foot cutter CG Loran Station Upolo Point Hawaii and CG Station Sabine Pass Texas. CWO McCollum was responsible for modifying and repairing the SESs and contributed many unique problem solving ideas which resulted in much improved operation of the Coast Guard Surface Effect Ship Division. Benton H. Schaub:is a senior engineer with Maritime Dynamics Inc. He has a bachelor of science degree in naval architecture and marine engineering from the Massachusetts Institute of Technology. Mr. Schaub has fifteen years of experience working as a test engineer project engineer and design engineer on advanced marine vehicle projects and is a recognized authority in the areas of hull structure seal system and machinery design for surface effect ships. He has participated in virtually every USN SES design development and test evaluation program including: XR-5 XR-10 SES-100A SES-100A1 and the SES-200. He is currently responsible for performing detailed design and analysis in support of the seal system for the Germa

During the early 1980s the United States Coast Guard took delivery of three surface effect ships (SES) from Bell Halter, Inc. These 136-ton, 30-knot plus, aluminum hulled cutters were to be used primarily for drug interdiction in the southeastern United States. By early 1985, however, the full load weight of these cutters had grown to 150 long tons, and their top speed had dropped to below 23 knots in calm water. By mid-1985, operation of all three SESs was suspended to prevent possible catastrophic failure of their main engines. At this point, the USCG joined ranks with Textron Marine systems (then Bell Aerospace), and Detroit Diesel to analyze what had gone wrong, and to propose solutions to the problems encountered. From that beginning, the performance of the Coast Guard's SESs has steadily and dramatically improved until at present all three cutters are able to exceed their original performance specifications. This paper discusses the problems experienced with the SESs, including engine overloading, vibration, ride quality, seal wear, poor lift system performance, and metal cracking, along with the corrective actions taken to solve them. The cooperation between government and private industry, which made this dramatic turn-around in performance possible, is also explored. Lessons learned about SES technology are viewed in relation to the general experience of the Coast Guard with other types of high performance hull forms.

关键词： NAVAL VESSELS

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GRAFCET and SFC as Factory Automation Standards Advantages and Limitations

GRAFCET and SFC as Factory Automation Standards Advantages a...

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American control Conference (ACC)

作者： A.D. Baker T.L. Johnson D.I. Kerpelman H.A. Sutherland Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Control Technology Branch General Electric Corporate Research and Development Center Schenectady NY USA

Two proposed programming standards for industrial automation, GRAFCET and SFC, are presented. The idea of what makes a `good' programming language is discussed, and the concept of a graphic programming language is introduced. The advantages and limitations of GRAFCET and SFC are presented. This paper concludes with a discussion of the need for further research for more general graphic programming languages for industrial automation.

关键词： Manufacturing automation Automatic control Programmable control Computer languages Relays Electrical equipment industry Industrial control Graphics Costs Logic programming

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