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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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The ge MEAD computer-aided control engineering environment

The GE MEAD computer-aided control engineering environment

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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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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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Parallel implementation of real-time control programs

Parallel implementation of real-time control programs

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IEEE Conference on Decision and control

作者： P.L. Shaffer Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

Two turbojet engine control programs were analyzed for potential parallelism. Both were subjected to global, hierarchical, large-grain data-flow analysis, using internally developed data-flow analysis tools. Execution times of constituent code segments or procedures were determined. Data dependences were combined with execution times to determine maximum possible speedup, using the length of the critical path as the shortest execution time. The first control program was divided into 199 code segments, and had a maximum speedup of 7.2. The second program consisted of 64 basic control procedures; this program has a maximum possible speedup of 5.3. The amount of data passed between the dependent tasks was small, averaging 1.3 values per dependency. Static, nonpreemptive schedules have been determined using a heuristic algorithm based on the critical path method. For the first control program this allowed a speedup of 6.6 using 7 processors; for the second, the maximum possible speedup of 5.3 was achieved using 6 processors. The first program is being implemented on a shared-memory bus-shaped multiprocessor.< >

关键词： Engines Actuators Data analysis control systems Processor scheduling Parallel processing Pressure control Temperature control Temperature sensors programmable logic arrays

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Scheduling Turbofan Engine control Set Points by Semi-Infinite Optimization

Scheduling Turbofan Engine Control Set Points by Semi-Infini...

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American control Conference (ACC)

作者： D.M. Stimler Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

It is shown that modern Semi-Infinite Optimization Methods provide a powerful method for determining the operating schedules of control set points for advanced turbofan engines. It is shown that these methods give the engineer considerable design freedom and shows how these methods can be used to develop engine schedules which optimize complex performance objectives and explicitly satisfy performance requirements on engine variables. This approach is also shown to provide insights as to the limits of engine performances and the control requirements of the engine. These methods are illustrated by determining portions of the steady state and transient operating schedules of a state-of-the-art single bypass turbofan engine.

关键词： Engines control systems Processor scheduling Open loop systems Steady-state programmable logic arrays Actuators Process design Power engineering and energy Fuels

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Towards Simultaneous Performance: Application of Simultaneous Stabilization Techniques to Helicopter Engine control

Towards Simultaneous Performance: Application of Simultaneou...

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American control Conference (ACC)

作者： K. Dean Minto Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

Despite the impact that the Stable Factorization (SF) approach has had on the academic community, its widespread acceptance and application by industry has been hampered by the natural lag in the development of design algorithms and their associated numerically reliable CAD implementations. Indeed, it is safe to say that computer-aided design support for the Stable Factorization methodology (and in fact, many of the principle design algorithms) have not as yet matured to the point where they may be readily applied by practising engineers. In this paper we describe on-going research aimed at refining one such design algorithm, namely simultaneous stabilization. Through application of the simultaneous stabilization design technique to a realistic aerospace control problem we seek to demonstrate the practical utility of the method, and identify the technical issues that remain to be resolved. The focus of this study is the ge T700 turboshaft engine, when coupled to the Apache and Blackhawk helicopter airframes. We describe our experiences with an indirect design technique to obtain an LTI compensator that simultaneously satisfies two loop-shaping type performance criteria, one for each engine-airframe combination.

关键词： Helicopters Engines control systems Algorithm design and analysis Robust control Electrical equipment industry Design automation Aerospace control Stability Resonance

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A Data-Base Management Scheme for Computer-Aided control Engineering

A Data-Base Management Scheme for Computer-Aided Control Eng...

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American control Conference (ACC)

作者： James H. Taylor Ko-Haw Nieh Peter A. Mroz Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA Information Systems Operation GE Corporate Research and Development Center Schenectady NY USA DuPont Chambers Works Jackson Laboratory Deepwater NJ USA

There has been substantial progress made in the past decade in the development of analysis and design software for computer-aided control engineering (CACE). Engineering data-base management (EDBM) for support of CACE has not received much attention until recently, however. As CACE environments become more comprehensive and more powerful, the need for keeping track of the models, simulations, analysis results, control system designs, and validation study results over the control system design cycle becomes more pressing and the lack of EDBM support becomes more of an impediment to effective controls engineering. We have defined and implemented a CACE environment with EDBM as an integral part. The data base is organized in a hierarchical famework having the levels Project, Sub-project, Model, Attribute, and Element. The levels Project and Sub-project accommodate several control engineers working on a single project, with a project lead engineer having responsibility and control of the entire data base. Within a project, Models (plant models, control system models, etc.) are the main focus. Each model has two attributes, a Description and a Result_set. Fundamental properties plus component models (representations of a plant, compensator, sensor, etc.) comprise the elements of a Description; elements of a Result_set include any data generated with the model, such as a time-history, frequency response, etc. One factor that complicates the CACE DBM problem is that system models used for simulation, analysis, and design activity usually evolve as a project progresses.

关键词： Engineering management control engineering computing control engineering Data engineering control system synthesis Power engineering computing Analytical models System analysis and design Software design Power engineering and energy

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