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AIAA/ASME/SAE/ASEE 28th Joint Propulsion Conference and Exhibit, 1992

作者： Ravi, R. Minto, K.D. Grafton, M. Bansal, I. Control Systems Laboratory Corporate Research & Development P.O. Box 8 SchenectadyNY12301 United States Advanced Control Analysis GE-Aircraft Englnes 1 Neumann Way CincinnatiOH45215 United States

Our objective is to develop a methodology for designing robust controllers for aircraft engines. Typically, information about engine-to-engine variations due to manufacturing tolerances and time degradation is represented by key parameters in the engine model. These parameters are statistically varied to generate a number of perturbed models from the baseline nonlinear model. This set of perturbed models into the standard norm bounded additive uncertainty form so that existing software can be used to design the controller. In the process we also propose a way of determining a nominal model which is needed in the design process. Our results show that using these modeling techniques along with modem robust design algorithms like ft, synthesis yield controllers that deliver superior performance as compared to existing classical controllers. While these results pertain mainly to aircraft engine control, the techniques elucidated here carry over to problems where the plant to be controlled is stable and the uncertainty information is available in a similar form. © American Institute of Aeronautics and Astronautics, Inc., 1992. All rights reserved.

关键词： Aircraft engines

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Future developments in Modern Environments for CADCS

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IFAC Proceedings Volumes 1991年第4期24卷 29-40页

作者： J.H. Taylor M. Rimvall H.A. Sutherland Control Systems Laboratory GE Corporate Research and Development P.D. Box 8 Schenectady NY 12301 USA

Recent and future efforts at GB to develop modem environments for CADCS are discussed. The basic elements of these systems are: • a User Interface which combines a “point-and-click” menu-and forms-driven interface with other access modes for the more experienced user • a Data-Base Manager organized in terms of Projects, Models and corresponding Results and other related data elements and including version control • an Expert System Shell, which performs routine higher-level CACE tasks, and • a data-driven Supervisor that integrates the above elements with existing CACE packages for linear and nonlinear simulation, analysis and design As is usually the case, it has been leamed that much more can be done to provide a fully supportive environment for controls engineering, and it has also become clear that certain things might better be done differently. This presentation will focus on such areas, especially on generic issues that can be applied to other CADCS systems

关键词： Computer-aided system design computer interfaces for CAD data-base management systems expert systems control engineering applications of computers

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MEAD II - An Improved CAD Environment for controls Engineering

MEAD II - An Improved CAD Environment for Controls Engineeri...

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American control Conference (ACC)

作者： James H. Taylor Magnus Rimvall Hunt A. Sutherland Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA Control Systems Laboratory GE Corporate R & D PO Box 8 Schenectady NY 12301

Recent and future efforts at ge to develop modern environments for Computer-Aided control Engineering (CACE) are discussed. The basic elements of these systems are: *a User Interface which combines a "point-and-click" menu- and forms-driven interface with other access modes for the more experienced user, *a Data-Base Manager organized in terms of projects, models and corresponding results and other related data elements and including control, *an Expert System Shell, which performs routine higher-level CACE tasks, and *a data-driven Supervisor that integrates the above elements with existing CACE packages for linear and nonlinear simulation, analysis and design. As is usually the case, it has been learned that much more can be done to provide a fully supportive environment for controls engineering, and it has also become clear that certain things might better be done differently. This presentation will focus on such areas.

关键词： control engineering control engineering computing User interfaces Project management control system synthesis Nonlinear control systems Expert systems Packaging Analytical models Performance analysis

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A multiprocessor implementation of real-time control for a turbojet engine

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IEEE control systems Magazine 1990年第4期10卷 38-42页

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

A real-time control program for a turbojet engine has been implemented on a four-processor computer, achieving a speedup of 3.38 times the speed of a sequential version of the same program on a single processor. The concurrent program was produced from a sequential program by subjecting the sequential program to global, hierarchical interprocedural data-flow analysis and timing measurements. A static schedule for the constituent tasks of the control program on the four processors was determined using a heuristic algorithm based on the critical-path method. The approach should be applicable to a variety of control and related programs where iterative tasks with well-bounded execution times are computed in systems with hard real-time requirements.< >

关键词： Engines Data analysis Timing Processor scheduling Heuristic algorithms Iterative algorithms Scheduling algorithm control systems Iterative methods Real time systems

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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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Computer-aided control Engineering Environments: Architecture, User Interface, Data-base Management, and Expert Aiding

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IFAC Proceedings Volumes 1990年第8期23卷 337-348页

作者： J.H. Taylor D.K. Frederick C.M. Rimvall H.A. Sutherland Control systems Laboratory GE Corporate Research and Development P.O. Box 8 Schenfctady NY 12301 USA Dept. of Electrical Computer andd Systems Engineering Rensselaer Polytechnic Institute Troy NY 12180 USA

Modern CAD environments for control systems engineering have begun to support substantial functionality beyond modeling, numerical analysis, and simulation. Three major areas that have emerged in the last five years are advanced user interfaces, data-base management, and expert-systems support ("expert aiding"), In addition, there has been a steady thrust to integrate more completely the various functionalities and software that comprise computer-aided control engineering (CACE). These trends have produced CACE environments which have relatively modest improvements in numerical quality but a vastly different "feel" in terms of integration, support, and "user friendliness. The basic considerations and requirements for a CACE user interface (UI), data-base manager (DBM), and expert aicling are discussed in detail. In many cases, these will be illustrated by examples based on various CACE software suites including the new ge MEAD CACE environment; the basic thrust will be to define needs and show how these can be met. The ge MEAD Project involves the integration of powerful CACE packages under a supervisor which coordinates the execution of these packages with a modern UI, a CACE-oriented DBM, and an expert system. The user interface is designed to facilitate access to the CACE package capabilities by users with widely different levels of familiarity with the environment. The data-base manager keeps track of system models that evolve over time and associates each analysis or design result with the correct model instance. The expert system supplies the machinery for expert aiding complicated or heuristic procedures to free the user from low-level detail and tedium. This system thus exemplifies the trends mentioned above

关键词： Computer-aided system design computer interfaces for CAD control engineering applications of computers data-base management systems expert systems software tools

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Trends in shop floor control: modularity, hierarchy, and decentralization

Trends in shop floor control: modularity, hierarchy, and dec...

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IEEE International Symposium on Intelligent control (ISIC)

作者： T.L. Johnson A.D. Baker Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA Department Electrical & Computer Engineering Rensselaer Polytechnic Institute Troy NY USA

Computational architectures for shop floor control in automated job shops and midvolume manufacturing facilities are evolving into three identifiable forms, which are contrasted here. The first architecture, termed the modular approach, is based on earlier monolithic MRP/order-release systems and is typified by recent CIM (computer-integrated manufacturing) product offerings such as ges CIMPLICITY. The second architecture is a hierarchical architecture, such as NIST's AMRF (National Institute of Standards and Technology's Automated Manufacturing research Facility) system. The third architecture is a contract net architecture which is fully decentralized and may be a candidate for future CIM systems. These architectural forms may be distinguished on the basis of the partitioning principles which predominate in their design.< >

关键词： Computer integrated manufacturing Hardware Power capacitors Local area networks Subcontracting Debugging Workstations programmable control Cost function Software packages

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A computer-aided control engineering environment for multi-disciplinary expert-aided analysis and design (EAD)

A computer-aided control engineering environment for multi-d...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： J.H. Taylor P.D. McKeehen Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

The MEAD (multidisciplinary expert-aided analysis and design) project involves integrating computer-aided control engineering (CACE) packages under a supervisor that coordinates the use of these packages with a database manager, an expert system, and an advanced user interface. The supervisor is the shell or package integrator for underlying CACE packages and coordinates all activity within the MEAD environment. The database manager keeps track of system models that evolve over time and relates each analysis or design result to the right model instance. The expert system provides expert aiding for clear cut but complicated procedures that would otherwise involve unnecessary low-level detail. The user interface facilitates access to the CACE package capabilities by users with widely different levels of familiarity with the environment and simplifies the use of the expert system and database manager. These goals are achieved by permitting the user to work in several modalities: a menu/forms-style user interface for basic CACE activity; use of MEAD commands when this mode expedites CACE work compared with the more user-friendly menu/forms mode; use of the core packages' native commands when the exact desired functionality is not conveniently available via MEAD commands; or use of the MEAD macro facility.< >

关键词： control engineering computing control engineering Packaging Databases Expert systems User interfaces Computer interfaces Project management Engineering management Environmental management

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Electric controls for a high-performance EHA using an interior permanent magnet motor drive

Electric controls for a high-performance EHA using an interi...

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IEEE National Conference on Aerospace and Electronics (NAECON)

作者： T.M. Jahns R.C. Van Nocker GE Corporate Research and Development Center Schenectady NY USA Aircraft Control Systems Department GE Binghamton NY USA

A controller for a high-performance electrohydrostatic actuator (EHA) has been developed using an interior permanent magnet (IPM) synchronous motor to produce the servo motion. The buried-magnet design of the IPM motor yields a combination of desired characteristics including high efficiency, robust rotor construction, and wide operating speed range. Power converter size has been minimized by using insulated-gate bipolar transistor (IGBT) power switches combined with high-voltage integrated circuit (HVIC) gate drivers in phase-leg power modules. Experimental results for the demonstrator motor-controller hardware rated at 12 hp (continuous) are presented which confirm the attractive performance characteristics of the IPM motor drive.< >

关键词： Synchronous motors Insulated gate bipolar transistors Motion control Actuators Servomechanisms Permanent magnet motors Servomotors Integrated circuit yield Robustness Rotors

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controller Parametrization for Multirate Plants

Controller Parametrization for Multirate Plants

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American control Conference (ACC)

作者： R. Ravi C. N. Nett K. D. Minto P. P. Khargonekar Department of Electrical Engineering University of Minnesota Minneapolis MN USA Control Systems Laboratory GE Corporate Research and Development Center Schenectady NY USA

In this note we consider the class of linear finite dimensional multirate operators in the general time-varying case and describe a way of parametrizing all stabilizing controllers for any plant in this class.

关键词： Sampling methods Time varying systems Throughput control system synthesis control systems Discrete time systems Output feedback Laboratories research and development Continuous time systems

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