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IEEE Control Systems Magazine

Issue 4 • June 1990

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Displaying Results 1 - 13 of 13
  • Design of localizer capture and track using classical control techniques

    Publication Year: 1990, Page(s):5 - 12
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (659 KB)

    A typical localizer capture and track mode of the automatic landing system control laws provided in new generation commercial airplanes is discussed. The linear control law consists of three separate modules: yaw damper, roll inner-loop, and localizer outer-loop. The yaw damper and roll inner-loop are used in conjunction with other modes of the roll axis control laws of the autopilot and are, ther... View full abstract»

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  • Design of localizer capture and track modes for a lateral autopilot using H-infinity synthesis

    Publication Year: 1990, Page(s):13 - 21
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    Results are presented of a design exercise in which the most recent developments in H-infinity synthesis theory were applied to the problem of designing a lateral autopilot for a typical transport airplane. The bulk of the engineering effort in applying these results was in the formulation of an appropriate synthesis model. Important aspects of this process are presented. The linear controller des... View full abstract»

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  • An explicit model-matching approach to lateral-axis autopilot design

    Publication Year: 1990, Page(s):22 - 28
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    The application of a linear multivariable control law design methodology to an autopilot design for large transport aircraft is described. The design method is an explicit model-matching approach, whereby compensator parameters are tuned via a least-squares optimization approach to minimize the error between the desired and the actual closed-loop frequency responses. This method incorporates some ... View full abstract»

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  • A real time microcomputer implementation of sensor failure detection for turbofan engines

    Publication Year: 1990, Page(s):29 - 37
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (998 KB)

    An algorithm that detects, isolates, and accommodates sensor failures using analytical redundancy has been developed. The performance of this algorithm has been demonstrated on a full-scale F100 turbofan engine. The algorithm has been implemented in real time on a microprocessor-based controls computer which includes parallel processing and high level language programming. Parallel processing was ... View full abstract»

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

    Publication Year: 1990, Page(s):38 - 42
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (606 KB)

    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 sta... View full abstract»

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  • Integration of active and passive sensors for obstacle avoidance

    Publication Year: 1990, Page(s):43 - 50
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1151 KB)

    A study is made of the automatic obstacle-avoidance guidance problem under the operational constraints imposed by the rotorcraft nap-of-the-earth (NOE) environment. The topic is discussed under two different circumstances. The first one assumes that a full range map is available, irrespective of the type of sensor being used. Two approaches are proposed to extend a two-dimensional obstacle-avoidan... View full abstract»

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  • Identification of flexible structures for robust control

    Publication Year: 1990, Page(s):51 - 58
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    Documentation is provided of the authors' experience with modeling and identification of an experimental flexible structure for the purpose of control design, with the primary aim being to motivate some important research directions in this area. A multi-input/multi-output (MIMO) model of the structure is generated using the finite element method. This model is inadequate for control design, due t... View full abstract»

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  • Space shuttle main engine model identification

    Publication Year: 1990, Page(s):59 - 65
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (547 KB)

    System identification techniques are used to represent the dynamic behavior of the SSME (space shuttle main engine). The comparison of the responses of a nonlinear simulation with the responses of an identified model indicates very good agreement. The identified model can be used for control design purposes. The identified model does not include valve linkage backlash and valve stiction nonlineari... View full abstract»

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  • Models of discrete event dynamic systems

    Publication Year: 1990, Page(s):69 - 76
    Cited by:  Papers (52)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    Many new techniques for modeling discrete event dynamic systems have been developed in recent years; among them are Markov processes and their imbedded Markov chains, Petri nets, queuing networks, automata and finite-state machines, finitely recursive processes, min-max algebra models, and discrete event simulation and generalized semi-Markov processes. The authors demonstrate the main features of... View full abstract»

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  • Performance evaluation of discrete manufacturing systems

    Publication Year: 1990, Page(s):77 - 86
    Cited by:  Papers (20)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1138 KB)

    An overview is presented of the performance evaluation of discrete manufacturing systems for the practicing engineer. The role of performance evaluation in today's manufacturing firm is discussed. Common techniques for performance evaluation are reviewed, with an indication of where and when these methods are most likely to be beneficial. An example of how performance evaluation can be used in the... View full abstract»

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  • A method for specifying, implementing, and verifying media access control protocols

    Publication Year: 1990, Page(s):87 - 94
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (847 KB)

    A successful approach to problems of protocol specification, implementation, and verification is presented. Protocols are specified in a language called LIFP (Language for Implementing Fast Protocols) which is based on a model of interacting state machines. A compiler translates LIFP specifications into code that can be executed on PNPS (programmable network prototyping system), an experimental ne... View full abstract»

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  • A logic for real-time discrete event processes

    Publication Year: 1990, Page(s):95 - 102
    Cited by:  Papers (11)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (910 KB)

    Temporal logic can be used to design controllers for real-time discrete event systems. The underlying plant dynamics is most economically described by a state transition structure with time bounds on the transitions. Temporal logic can then be used to specify the problem to be solved and help in the derivation and verification of a suitable controller. The author discusses the nature of real-time ... View full abstract»

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  • Concurrency and discrete event control

    Publication Year: 1990, Page(s):103 - 112
    Cited by:  Papers (83)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1022 KB)

    Much of discrete event control theory has been developed within the framework of automata and formal languages. An alternative approach inspired by the theories of process-algebra as developed in the computer science literature is presented. The framework, which rests on a new formalism of concurrency, can adequately handle nondeterminism and can be used for analysis of a wide range of discrete ev... View full abstract»

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Aims & Scope

This Magazine ceased publication in 1990. The current retitled publication is IEEE Control Systems.

Full Aims & Scope