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29th IEEE Conference on Decision and Control

5-7 Dec. 1990

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Displaying Results 1 - 25 of 807
  • Controller parametrization and pole-placement design for simultaneous stabilization

    Publication Year: 1990, Page(s):3475 - 3480 vol.6
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The authors investigate the use of stable inversion to obtain nonswitching controllers for the simultaneous stabilization of systems with multiple operating conditions. In a previous work (1990) the authors required the high-frequency gains of the models of the different operating conditions to satisfy a full rank condition. In this paper they remove that constraint and consider general system mod... View full abstract»

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  • A fixed H/sup infinity / controller for a supermaneuverable fighter performing the Herbst maneuver

    Publication Year: 1990
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (52 KB)

    Summary form only given, as follows. An H/sup infinity / flight control system design case study for a supermaneuverable fighter flying the Herbst maneuver is discussed. The Herbst maneuver presents an especially challenging flight control problem because of the extraordinarily large ranges of airspeed, angle of attack, and angular rates. A fixed H/sup infinity / controller has been developed for ... View full abstract»

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  • Proceedings of the 29th IEEE Conference on Decision and Control (Cat. No.90CH2917-3)

    Publication Year: 1990
    Request permission for commercial reuse | PDF file iconPDF (16 KB)
    Freely Available from IEEE
  • Modeling, design, and control of flexible manipulator arms: a tutorial review

    Publication Year: 1990, Page(s):500 - 506 vol.2
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (841 KB)

    High performance manipulators with dynamic behavior in which the flexibility is an essential aspect are addressed. The mathematical representations commonly used in modeling flexible arms and arms with flexible drives are first examined. Then design considerations directly arising from the flexible nature of the arm are discussed. Finally, controls of joints for general and tip motion are discusse... View full abstract»

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  • Input-bounded nonlinear control of a chemical reactor

    Publication Year: 1990, Page(s):1618 - 1619 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    The authors present a geometric framework to address the problem of nonlinear control designs for chemical reactors that, under certain operation conditions, have a propensity to meet their input bounds. Conditions for the avoidance of undesired equilibrium points are presented. A dynamic analysis of the closed-loop behavior is performed. Numerical simulations are presented to illustrate some of t... View full abstract»

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  • Robust stability bounds for a class of nonlinear feedback systems with output quantization

    Publication Year: 1990, Page(s):204 - 205 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (108 KB)

    A nonlinear observer is used as a basis for a class of dynamic compensators to control a linear system with incompletely known nonlinear actuator characteristics and with quantized output measurements. Using the Gronwall-Bellman inequality, a sufficient condition is derived to insure the asymptotic stability of the closed-loop compensated system View full abstract»

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  • Worst case analysis and design of sampled data control systems

    Publication Year: 1990, Page(s):202 - 203 vol.1
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Considered are sampled data systems with continuous-time inputs and outputs, where some state variables evolve in continuous-time and others evolve in discrete-time. A method is presented for computing and optimizing the L2 induced norm of such systems considered as operators relating square integrable signals View full abstract»

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  • On the role of disturbance estimation in H control systems

    Publication Year: 1990, Page(s):200 - 201 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    In this paper, based on the analysis of H∞ controllers, an interesting and crucial observation concerning the structure of H∞ control systems is obtained. Due to this observation, closed-loop H∞ control systems can be clearly described as a disturbance estimator which is used to diminish the effect of exogenous input on the output. A clear represe... View full abstract»

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  • Prediction of helicopter simulator sickness

    Publication Year: 1990, Page(s):2380 - 2385 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Machine learning methods from artificial intelligence are used to identify information in sampled accelerometer signals and associative behavioral patterns which correlate pilot simulator sickness with helicopter simulator dynamics. In this work, accelerometers were installed in the simulator cab, enabling a complete record of the flight dynamics and the pilot's control response as a function of t... View full abstract»

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  • A method to solve power system static-state estimation problems by using a network of processors

    Publication Year: 1990, Page(s):3067 - 3072 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    An RQPD (recursive quadratic programming with the dual method) method is developed for power system static-state estimation. Its global convergence is proved, and the parallel RQPD algorithm to be executed in a processor-network is also developed. Simulation results demonstrating the numerical accuracy and the computational performance of this parallel RQPD algorithm are presented. In the computat... View full abstract»

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  • On decentralized on-line scheduling of FMS

    Publication Year: 1990, Page(s):125 - 127 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The scheduling problem is considered for medium sized (5-10 machines or workplaces) flexible manufacturing systems which are part of a larger production process. The general philosophy is to divide the scheduling problem into a number of local decentralized problems: the optimal sequencing and routing of the jobs within flexible manufacturing systems or small workshops. The subsystems are coordina... View full abstract»

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  • Low order robust H controller synthesis

    Publication Year: 1990, Page(s):194 - 199 vol.1
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Robust stability of the closed-loop behavior of plants is investigated. It is shown that when the distance between the nominal plant model and the boundary of the nominal plant envelope is measured in the gap metric, a sufficient condition on the closed-loop stability can be given. Low-order controllers are derived using either model reduction or controller reduction techniques. It is shown that w... View full abstract»

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  • A novel associative memory for high level control functions

    Publication Year: 1990, Page(s):2374 - 2379 vol.4
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    A novel associative memory (AM) knowledge base for real-time diagnostics and high-level control functions for complex large-scale dynamic systems is presented. The proposed AM architecture is called ASDM as it is an adaptive architecture based on the sparse distributed memory (SDM) first introduced by Kanerva (1988). ASDM is proposed to overcome many limitations of SDM, while keeping most of the a... View full abstract»

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  • A Hankel singular value approach for identification of low level dynamics in flexible structures

    Publication Year: 1990, Page(s):2575 - 2579 vol.5
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The intensity of dynamics in a flexible structure is characterized by its Hankel singular values. Low level dynamics may be caused by generic properties of a structure or by its actuator and sensor configurations. In the latter case, it is shown that the dynamics can significantly be amplified by small perturbations of actuator and/or sensor configurations. In the presented examples, the variation... View full abstract»

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  • Inductive learning in power system voltage control

    Publication Year: 1990, Page(s):3065 - 3066 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The application of inductive learning to voltage control and contingency assessment of power systems is considered. The first application discussed is the identification of correct control amount for remedial actions. The inductive learning application is intended to obtain a decision tree which identifies a proper value of the low voltage limit. It is shown that learning capability can be incorpo... View full abstract»

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  • Flow shop scheduling by a Lagrangian relaxation and network flow approach

    Publication Year: 1990, Page(s):122 - 124 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    By using advanced optimization methods, a production scheduling algorithm is developed for discrete-part, make-to-order type of flexible flow shops. The goal of scheduling is to meet due dates and the problem is formulated as a large-scale integer programming problem. The scheduling algorithm includes four parts: decomposition by Lagrangian relaxation into subproblems, a minimum cost linear networ... View full abstract»

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  • Application of nonlinear control strategies to aircraft at high angle of attack

    Publication Year: 1990, Page(s):188 - 193 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Nonlinear control strategies as applied to a high-alpha vehicle are discussed. The intent is to evaluate these methods for their benefit and advantage over conventional gain-scheduled linear controllers. Several techniques and their associated mechanisms are identified. The test aircraft used is the X-29, which is particularly suited for manoeuvering at a high-alpha regime. A classical linear cont... View full abstract»

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  • A neural-net computing algorithm for detecting edges in a gray scale image

    Publication Year: 1990, Page(s):2368 - 2373 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    The algorithm presented features simple connections between neurons and is highly effective in detecting edges in noisy gray-scale images. The algorithm consists of two steps: image filtering and edge detection. The image filtering portion detects the zero crossings of Di2G (x, y) × l(x, y) where D<... View full abstract»

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  • A controller design for compliant manipulators modeled with elastic links and joints

    Publication Year: 1990, Page(s):1936 - 1942 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A controller for general flexible robotic manipulators is developed. A flexible manipulator system's dynamics is first transformed into error-driven dynamic equations by nonlinear feedforward and PID feedback loops. The solution is then stabilized asymptotically by using the second method of Lyapunov. Also, the special structure of the problem is exploited to find a closed-form solution to the Lya... View full abstract»

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  • A decentralized discrete-time controller for dynamic routing

    Publication Year: 1990, Page(s):1362 - 1366 vol.3
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A decentralized controller for dynamic routing in multi-destination large-scale data communication networks is presented. A dynamic model, which can incorporate different processing delays at different nodes, is developed to describe the network dynamics. It is assumed that the rate of messages being sent out from one node to another (the control signals) is updated at discrete time instants, whic... View full abstract»

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  • A nonlinear vibration control design with a neural network realization

    Publication Year: 1990, Page(s):2569 - 2574 vol.5
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A novel type of nonlinear dynamic controller design is explored that was originally motivated by certain issues in the problem of vibration suppression in flexible structures. Because of the particular form of quadratic nonlinearities, the controller provides extremely efficient energy exchange mechanisms capable of rapidly draining energy away from the structural plant. In addition the controller... View full abstract»

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  • Computer analysis of static bifurcation in power networks

    Publication Year: 1990, Page(s):3063 - 3064 vol.6
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    The authors summarize an approach to the static bifurcation analysis of electric power networks which combines bifurcation theory with proven computational methods and a graphical representation of information which has intuitive appeal. The relationship between contour maps and static bifurcation of power system equilibrium equations is examined. Preliminary results identify the limitations as we... View full abstract»

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  • Representations of controllers that achieve robust performance for systems with real parameter uncertainty

    Publication Year: 1990, Page(s):1201 - 1202 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The author considers a family of single-input single-output plants described by transfer functions that involve real parameter uncertainty. Parameter values are known to lie in a hypercube. It is assumed that a class of available controllers has been prescribed, along with a bound for the sensitivity transfer function to ensure tracking. It is of interest to determine whether a controller from the... View full abstract»

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  • The closed-loop expression of the minimum energy control for multi-input linear digital control systems

    Publication Year: 1990, Page(s):1656 - 1661 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The minimum energy control problem for the multi-input linear time-invariant discrete-time system is discussed. Though the open-loop expression of the optimal inputs has been obtained, it is difficult to solve the two-point boundary value problem with the zero terminal state and to obtain the closed-loop expression with bounded gains. First, the general inputs which satisfy the zero terminal state... View full abstract»

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  • Structured servo controller design using output-feedback

    Publication Year: 1990, Page(s):2293 - 2299 vol.4
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The authors propose a general linear quadratic tracker formulation using output-feedback that allows the use of a dynamic compensator of prescribed structure. The performance index is of a general form that covers various design objectives and includes time weighting of the form tk, as well as steady-state error weighting. Necessary conditions for the optimal control gains are ... View full abstract»

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