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IEEE Control Systems

Issue 3 • Date April 1991

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Displaying Results 1 - 10 of 10
  • Real-time monitoring and control in plasma etching

    Publication Year: 1991, Page(s):3 - 10
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (631 KB)

    Process control strategies have been developed for plasma etching of silicon (Si) and silicon dioxide (SiO/sub 2/) in a CF/sub 4//O/sub 2/ plasma. The analysis considered four measured variables, four manipulated variables, and up to seven performance variables. Empirical input-output models were developed by regression analysis. Relative gain array analysis and singular value decomposition were u... View full abstract»

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  • Time optimal contour tracking for machine tool controllers

    Publication Year: 1991, Page(s):11 - 17
    Cited by:  Papers (11)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    A decomposition procedure was used to optimize feedrate and voltage control of biaxial contouring systems. The optimization procedure takes into account the contour-error, voltage, and current constraints while tracking the contour in minimum time. The tracking time is first minimized with respect to the feedrate profile using a nominal linear-quadratic-regulator type of controller. Using the feed... View full abstract»

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  • An expert system to perform on-line controller tuning

    Publication Year: 1991, Page(s):18 - 23
    Cited by:  Papers (27)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (498 KB)

    An expert system that tunes a proportional-integral-derivative (PID) controller online for a single-input-single-output multiple-lag process with dead time is described. The expert system examines features of each transient response and the corresponding controller parameters. It determines a new set of controller gains to obtain a more desirable time response. This technique can be used to determ... View full abstract»

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  • Control of a six-degree-of-freedom flexible industrial manipulator

    Publication Year: 1991, Page(s):24 - 30
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (511 KB)

    A controller design is proposed for manipulators modeled with joint and link compliances. First, nonlinear feedforward and PID state feedback components are used in the controller, and manipulator dynamics are converted into error-driven system dynamic equations. Then, the error-driven dynamic equations are stabilized using the second method of Lyapunov. The special structure of the Lyapunov matri... View full abstract»

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  • Radial basis function networks for classifying process faults

    Publication Year: 1991, Page(s):31 - 38
    Cited by:  Papers (161)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    It is shown that under certain conditions the backpropagation network classifier can produce nonintuitive, nonrobust decision surfaces. These result from the inherent nature of the sigmoid transfer function, the definition of the training set, and the error function used for training. The backpropagation network has no mechanism in the standard training scheme for identifying regions not in any kn... View full abstract»

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  • Nonlinear adaptive control of a twin lift helicopter system

    Publication Year: 1991, Page(s):39 - 45
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (467 KB)

    The tracking control of a twin-lift helicopter system in the presence of parametric uncertainty is considered. A nonlinear model is used to describe the dynamics of a twin-lift helicopter configuration in the lateral/vertical plane, and a controller is synthesized using an input-output feedback linearization technique in conjunction with an adaptation algorithm. The control scheme does not require... View full abstract»

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  • Precision pointing control for an orbital Earth observing system

    Publication Year: 1991, Page(s):46 - 52
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (570 KB)

    The design concept developed for the pointing system of the High-Resolution Imaging Spectrometer (HIRIS) which will be flown on one of NASA's Earth observing system platforms is presented. The instrument is an F 5.4-aperture spectrometer with a focal length of 1222 mm, and it uses a precision two-axis gimballed mirror pointing system to image and track targets. Pointing accuracy of better than 585... View full abstract»

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  • An expert system for automated highway driving

    Publication Year: 1991, Page(s):53 - 61
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1435 KB)

    The applicability of expert systems to the task of guiding an automobile on a limited-access highway is studied. The vehicle is assumed to be equipped with sensors detecting the surrounding traffic, road signs, and road geometry as well as control logic and actuators governing the throttle, steering angle, and brakes. The goal of the expert system is to issue commands to the controllers, given the... View full abstract»

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  • Robust decentralized control laws for the ACES structure

    Publication Year: 1991, Page(s):62 - 70
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (665 KB)

    Control system design for the Active Control Technique Evaluation for Spacecraft (ACES) structure at NASA Marshall Space Flight Center is discussed. The primary objective of this experiment is to design controllers that provide substantial reduction of the line-of-sight pointing errors. Satisfaction of this objective requires the controllers to attenuate beam vibration significantly. The primary m... View full abstract»

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  • Active vibration control using fixed order dynamic compensation with frequency shaped cost functionals

    Publication Year: 1991, Page(s):71 - 78
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    An approach for the design of controllers for active suppression of helicopter vibration that combines recent developments in the design of fixed-order dynamic compensators with the frequency-shaped cost functional approach is presented. A robust compensator that provides loop shaping at the plant input is used in conjunction with frequency-shaped cost functionals to arrive at a controller for vib... View full abstract»

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As the official means of communication for the IEEE Control Systems Society, the IEEE Control Systems Magazine publishes interesting, useful, and informative material on all aspects of control system technology for the benefit of control educators, practitioners, and researchers.

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Jonathan P. How
jhow@mit.edu