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Proceedings of the 28th IEEE Conference on Decision and Control,

13-15 Dec. 1989

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Displaying Results 1 - 25 of 617
  • Estimation of elastic coefficients for a two beam structure

    Publication Year: 1989, Page(s):613 - 617 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (271 KB)

    Consideration is given to the estimation of spatially dependent elastic parameters in a static distributed model of a simple structure composed of two beams at right angles. The potential energy functional of the system is formulated, and the existence of optimal estimators is proved for a regularized-output least-squares estimation problem. Regularity and approximation are discussed as well. The ... View full abstract»

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  • Hybrid control in the nematode

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (40 KB)

    Summary form only given. A research effort on the structure and organization of complex systems, based on a simple biological model, the nematode species C. elegans an dAscaris, has been initiated. The work, which emphasizes the nervous system, centers on construction of a computer representation of the organism, using multiple interconnected partial models reflecting its interacting computational... View full abstract»

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  • Hierarchical control of steady-state systems using an augmented Lagrangian tracking method with feedback

    Publication Year: 1989, Page(s):837 - 839 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Resolution methods using feedback information, developed for the steady-state optimizing control of large-scale industrial processes, call upon the notion of the Lagrange operator. Further developments of one of these methods, to make it applicable to a problem with duality gaps and to improve the efficiency of the algorithm, are presented. The approach is based on an application of the augmented ... View full abstract»

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  • The pseudorandom asymptotic behavior of digitally controlled analog systems

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (81 KB)

    Summary form only given. The author has investigated some interesting descriptive and prescriptive questions that arise from a careful examination of the manner in which finite-precision phenomena, including measurement quantization and finite-wordlength arithmetic, affect the closed-loop performance of digitally controlled, discrete-time, state-space linear systems. In many cases of practical int... View full abstract»

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  • Decentralized control system design for a variable-cycle gas turbine engine

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (65 KB)

    Summary form only given. The selection of decentralized control structures, as well as decentralized control law design for the chosen structures, has been addressed. In each of these two phases of the design process due consideration has been given to the nonlinear characteristics of the engine, such as operating point variations, actuator limits, and fuel limit schedules. The chief analytical to... View full abstract»

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  • Bayesian adaptive filters for multiple maneuvering target tracking with measurements of uncertain origin

    Publication Year: 1989, Page(s):1397 - 1399 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (234 KB)

    The probabilistic data association method has been successfully used for tracking targets in the presence of source uncertainty and measurement inaccuracy. Using this technique, the problem of maneuvering-target tracking is considered. A description is given of three adaptive methods which are intrinsically different for tracking single and/or multiple targets. These methods are called the adaptiv... View full abstract»

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  • Recent developments in perturbation analysis

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    Summary form only given. The purpose of this study is to review some of the more recent developments in perturbation analysis (PA) from a unified viewpoint. Concepts such as aggregation, statistical equivalence, smoothing, uniformization, and representation of stochastic processes take on more concrete meanings when viewed in the unified PA mind-set. The richness of the subject matter will become ... View full abstract»

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  • Certainty equivalence control with forcing: revisited

    Publication Year: 1989
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (42 KB)

    Summary form only given, as follows. Stochastic adaptive optimization problems are considered with the objective of minimizing the rate of increase of the learning loss, i.e. the additional cost one has to pay due to the inbuilt learning tasks in such problems. In particular, an examination is made of two problems: the multiarmed bandit problem, and the adaptive control of Markov chains. Previous ... View full abstract»

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  • Properties of the Euler-Bernoulli beam equation and the Kirchoff plate equation related to controllability

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    Summary form only given. A discussion is presented of the propagation of singularities, uniqueness questions, and other properties of the Euler-Bernoulli beam equation and the Kirchoff plate equation. A result previously obtained by the author (1985), which essentially gave an explicit solution to the boundary control problem for the plate equation u/sub tt/+ Delta /sup 2/u=0, is expanded upon to ... View full abstract»

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  • Time-varying vs. time-invariant compensation for rejection of persistent bounded disturbances and robust stabilization

    Publication Year: 1989
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (47 KB)

    Summary form only given, as follows. Consideration is given to time-varying compensation for linear time-invariant discrete-time plants subject to persistent bounded disturbances. In the context of certain feedback objectives, it is shown that time-varying compensation offers no advantage over time-invariant compensation. These results complement similar results for feedback systems subject to fin... View full abstract»

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  • A new feedback optimization problem

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    Summary form only given. Methods for stabilizing a plant P with an affordable variable structure Delta P are derived, starting with an operator optimization problem. When C represents the series compensator, Delta C the series compensator which is activated when Delta P is present, F the feedback compensator, Delta F the feedback compensator which is activated when Delta P is present, r the refere... View full abstract»

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  • Randomized and deterministic routing strategies for circuit-switched networks: design and performance

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (47 KB)

    Summary form only given. An investigation of two fundamentally separate classes of routing algorithms, randomized and deterministic, is reported. The main randomized algorithm is the recently introduced dynamic alternate routing algorithm of Gibbens and Kelly. In the contrasting deterministic algorithm, attempts to carry a call are made in a specific precomputed order. The design of these routing ... View full abstract»

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  • A numerical technique for the estimation of the diffusion coefficient in parabolic systems

    Publication Year: 1989, Page(s):2743 - 2747 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    A hybrid method for estimating a temporally and spatially varying diffusion coefficient in a parabolic system is presented. This technique combines the output-least-squares and the equation error method. The resulting optimization problem is solved by an augmented Lagrangian approach. Convergence of the algorithm and stability of the estimated coefficient with respect to perturbations in the obser... View full abstract»

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  • Proceedings of the 28th IEEE Conference on Decision and Control (Cat. No.89CH2642-7)

    Publication Year: 1989
    Request permission for commercial reuse | PDF file iconPDF (7882 KB)
    Freely Available from IEEE
  • Control of a flexible robot arm

    Publication Year: 1989, Page(s):2300 - 2303 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    A flexible robot arm, supported at a prismatic joint so that the length of (the relevant part of) the rod is variable, is modelled. The variation in the length of the arm is taken to be the control action. The principal results are exact controllability for the consideration of purely longitudinal vibrations (wave equation) and the existence of optimal controls in the more practically interesting ... View full abstract»

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  • Exponential decay for semilinear distributed systems with localized damping

    Publication Year: 1989, Page(s):2295 - 2299 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    The author shows how multiplier techniques and unique continuation principles can be combined to prove exponential decay results for solutions of various semilinear evolution equations with a localized damping (i.e. a damping term that is effective only on a subregion of the domain where the equation holds). Both bounded and unbounded domains are considered View full abstract»

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  • Exact controllability of semilinear abstract systems with application to waves and plates boundary control problems

    Publication Year: 1989, Page(s):2291 - 2294 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    Consideration is given to the question of (global) exact controllability for a class of semilinear abstract differential equations with dynamical properties such as arise in wave/plate boundary control problems. The main goal is to prove that under the assumptions of exact controllability of the linear part of the dynamics and approximate controllability of its linearization, the original semiline... View full abstract»

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  • Robot navigation research at CESAR

    Publication Year: 1989, Page(s):1162 - 1166 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The core of the navigation program for the Oak Ridge CESAR (Center for Engineering Systems Advanced Research) robots is a production system developed on the expert system shell CLIPS, which runs on an NCUBE hypercube aboard the robot. The production system can call on C-compiled navigation procedures. The production rules can read the sensor data and address the robot's effectors. This architectur... View full abstract»

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  • Canonical forms on discrete linear periodically time-varying systems and a control application

    Publication Year: 1989, Page(s):1220 - 1225 vol.2
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Canonical forms for discrete linear N-periodically time-varying (LP) completely reachable systems x(k)= Akx(k)+Bku (k) and y(k)=Ckx (k)+Dku(k) that generalize the linear time-invariant (LTI) case are pre... View full abstract»

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  • A new robust controller for linear systems with arbitrarily structured uncertainties

    Publication Year: 1989, Page(s):431 - 435 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The design of robust controllers for linear single-input-single-output (SISO) systems with uncertainties due to modeling errors and disturbances is considered. It is assumed that a nominal state-space model as well as quantitative bounds on system uncertainties are given. No structural condition such as the matching condition is imposed on system uncertainties. However, it is assumed that the syst... View full abstract»

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  • On the control of networks of vibrating strings and beams

    Publication Year: 1989, Page(s):2287 - 2290 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The authors introduce nonlinear equations describing the vibrations in space of networks of elastic strings and beams. Linearization about an equilibrium configuration yields a hyperbolic system of linear equations coupled by conditions at the multiple nodes where several network members meet. The authors study the controllability of these systems by controls exercised at some nodes. The multiplie... View full abstract»

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  • An exact efficient discrete-event model for production lines with buffers

    Publication Year: 1989, Page(s):65 - 70 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    A hybrid simulation/analytic model is presented for unreliable production lines with buffers and discrete workparts. The system is decomposed into one segment which is tractable by simulation and another one tractable by analysis. The model is exact and much faster than conventional piece-by-piece simulators. It can analyze efficiently and accurately lines of any size during either transient or st... View full abstract»

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  • Vibrational feedback control in the problem of absolute stability

    Publication Year: 1989, Page(s):2214 - 2217 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    It is shown that for any rational G(s)=n(s)/d(s) with d(s) Hurwitz and deg d(s)-deg n(s)=1 there exists a linear dynamic periodic controller that ensures the infinite sector of absolute stability. This implies that additional dynamics lead to improvements in stability of nonlinear closed-loo... View full abstract»

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  • Sensor-based terrain acquisition: the `sightseer' strategy

    Publication Year: 1989, Page(s):1157 - 1161 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Concerns a special case of the problem of robot motion planning, in which a mobile robot is required to build a complete map of an unfamiliar scene populated with a finite number of unknown objects (obstacles). The robot has a sort of sensory feedback equivalent to stereo vision or a range finder, and is expected to generate a reasonably short path during the operation. The terrain acquisition pro... View full abstract»

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  • Efficient matrix-valued algorithms for solving stiff Riccati differential equations

    Publication Year: 1989, Page(s):885 - 887 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (212 KB)

    Efficient algorithms are developed for solving time-varying stiff Riccati differential equations (RDEs). The method is also applicable to time-invariant, nonstiff problems. The algorithm can handle various classes of RDEs, i.e., time-varying or time-invariant, symmetric or nonsymmetric, and rectangular or square. The amount of work required to compute the solution per time step is O(... View full abstract»

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