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Proceedings of the 27th IEEE Conference on Decision and Control

7-9 Dec. 1988

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  • Proceedings of the 27th IEEE Conference on Decision and Control (IEEE Cat. No.88CH2531-2)

    Publication Year: 1988
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  • Robustness of time-delay systems: a survey

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (39 KB)

    Summary form only given. A survey was made of recent results on robustness of time-delay systems in the parameter-space framework. Robust stability, robust stabilization, and bounds on H-infinity norm were the main topics considered. It has been demonstrated on a counterexample that Kharitonov's theorem on the stability of interval polynomials is not extendable to polynomials in s and exp (-hs).<<... View full abstract»

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  • Analog neural systems

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (46 KB)

    Summary form only given. The author describes work in understanding the limitations of analog computing systems and their relevance to several problems involving neural networks. Two main themes are considered, both involving computational complexity considerations. The first theme involves the proposal that neural networks be used to solve the 'intractable' (NP-complete) combinatorial optimizatio... View full abstract»

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  • Communication issues in parallel and distributed optimization algorithms

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (23 KB)

    Summary form only given, as follows. Massive speedups through parallel optimization methods will not likely be achieved without efficient communication between processors. Three related issues are discussed: optimization algorithms that can take advantage of special communication-efficient hardware such as processor arrays; optimal routing algorithms for linear algebra calculations in message-pass... View full abstract»

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  • Some communication complexity issues in asynchronous algorithms

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (44 KB)

    Summary form only given. The author has studied an asynchronous version of the Bellman-Ford algorithm for computing the shortest distances from all nodes in a network to a fixed destination. It is known that this algorithm has (in the worst case) exponential (in the size of the underlying graph) communication complexity. The author has obtained results indicating that its expected (in a probabilis... View full abstract»

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  • Distributed load balancing

    Publication Year: 1988
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (95 KB)

    Summary form only given. The authors solve a load balancing problem for parallel processors, given limited state information. The novelty of the problem is that the routing units at the parallel arrival streams of tasks have different and limited state information. This makes the problem a team problem of a distributed control problem. The engineering model for this problem consists of arrival str... View full abstract»

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  • Adaptive motion control of rigid robots: a tutorial

    Publication Year: 1988, Page(s):1575 - 1584 vol.2
    Cited by:  Papers (149)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (763 KB)

    An account is given of several adaptive control results for rigid robot manipulators. The intention is to lend some perspective to the growing list of adaptive control results for manipulators by providing a unified framework for comparison of those adaptive control algorithms which have been shown to be globally convergent. In most cases the authors are able to simplify the derivations and proofs... View full abstract»

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  • Robustness of flexible structures against small time delays

    Publication Year: 1988, Page(s):1647 - 1648 vol.2
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The authors give transfer matrices for some models described by partial differential equations. From these transfer matrices the poles and zeros are easily derived. The effect of a small time delay in the feedback loop is considered, and it is shown that if the feedthrough in the loop is too strong, this will give instability. The transfer matrices have the advantage that the amount of feedthrough... View full abstract»

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  • A new approach to robust adaptive control in the presence of unknown and bounded disturbances

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (79 KB)

    Summary form only given. An adaptive l/sup 1/ controller has been based on the certainty-equivalence approach where at each step the system parameters are estimated and used to implement the controller. At each estimation stage a modeling error is committed which affects the output of the estimated plant. The l/sup 1/ optimal controller has been constructed to minimize the effect of this error on ... View full abstract»

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  • On the foundations of system identification

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (27 KB)

    Summary form only given. One philosophically coherent position is to view system (or process) identification as the search for a theory (or model) in a given class that minimizes a (loss) function of (1) the cumulative prediction errors incurred using a particular model and (2) a measure of the complexity of the model (such as the McMillan degree of a linear predictor). The resulting identificatio... View full abstract»

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  • On the role of renewal theory in the analysis of a class of cyclic hybrid-state stochastic systems

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    Summary form only given. The author reviews a class of cyclic hybrid-state stochastic processes arising in the modeling of thermostat-controlled electric power system loads, and particularly important in load management applications. He shows that there are two distinct viewpoints for analyzing the statistical properties of these processes: an internal viewpoint and an external one. The internal v... View full abstract»

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  • A geometric isomorphism with applications to closed loop controls

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (62 KB)

    Summary form only given. In this work feedback equivalence of n-state, (n-1)-control systems satisfying certain regularity conditions divides such systems into two invariant classes. The author shows that class 1 corresponds, via a geometric isomorphism, to classical Lagrangian variational problems. He proves the existence of time-critical closed-loop controls for systems which satisfy the nondege... View full abstract»

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  • Performance of high priority traffic on a token bus network

    Publication Year: 1988, Page(s):1489 - 1495 vol.2
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The authors propose a cost equation to measure the performance of a communications network handling several classes of disparate data. Specifically, it accounts for how well the network is satisfying the time-constraint requirements of each class of data. To compute this measure for the token-passing bus, the authors develop the necessary analysis to compute the queue statistics and delay distribu... View full abstract»

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  • An energy approach to controllability

    Publication Year: 1988, Page(s):2072 - 2077 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    The authors formulate an energy approach to the control of linear systems. Recent ideas developed for balancing coordinate transformations motivate this approach. Specifically, the geometry of the controllability Gramian and its relationship to the system eigenstructure underlie the controllability of a system from an input energy perspective. After detailing these ideas, the authors describe an a... View full abstract»

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  • Performance of Markovian access protocols in satellite channels

    Publication Year: 1988, Page(s):1487 - 1488 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A theory previously developed by the authors (1987) is extended to channels with long propagation delays. Specifically, the performance characteristics of Markovian access control protocols in satellite channels are evaluated. It is shown that the channel propagation delay can lead to improvements in the system's behavior, i.e. to a destruction of the saturation effects and to stabilization of the... View full abstract»

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  • Robust H control design for systems with structured parameter uncertainty

    Publication Year: 1988, Page(s):965 - 972 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (564 KB)

    In a recent paper a unification of the L2 (LQG) and H∞ control design problems was obtained in terms of modified algebraic Riccati equations. In this study these results are extended to guarantee robust L2 and H∞ performance in the presence of structured real-valued parameter variations in the state-space m... View full abstract»

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  • Hidden modes of interconnected systems in control design

    Publication Year: 1988, Page(s):2066 - 2071 vol.3
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    A complete treatment of the hidden modes of interconnected systems in control design is presented that extends and unifies several results which have appeared in the literature in the past decades. The uncontrollable and/or unobservable hidden modes of one- and two-degree-of-freedom control systems are characterized in terms of transfer matrices of the interconnected subsystems and in terms of des... View full abstract»

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  • Nonlinear observer for a class of mechanical systems

    Publication Year: 1988, Page(s):934 - 935 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The problem of designing an observer for a particular class of nonlinear mechanical systems is investigated. For this class, the error between the state of the system and the state of the observer is described by a linear differential equation with an output-dependent dynamical matrix. Existence conditions are derived on the basis of a known result on the stability of slowly varying systems. An an... View full abstract»

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  • A generalized uncertainty threshold principle for discrete systems with jump Markov parameters and multiplicative noise

    Publication Year: 1988, Page(s):1926 - 1927 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    The author presents a generalized version of the uncertainty threshold principle for discrete-time systems with both jump Markov parameters and multiplicative noise. It is shown that it is only if this threshold is not exceeded that an optimal steady-state control can exist View full abstract»

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  • A hybrid design for robot path planning in the presence of obstacles

    Publication Year: 1988, Page(s):2276 - 2277 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    A method combining the tools of combinatorics and optimal control theory is presented to solve the path-planning problem. Initially, a combinatorial problem is solved to identify collision-free paths originally designed for a point object. Then the problem of moving the actual object through the safe paths for the point object is posed as an optimal control problem and is solved using a numerical ... View full abstract»

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  • Controllers which satisfy a closed-loop H-norm bound and maximize an entropy integral

    Publication Year: 1988, Page(s):959 - 964 vol.2
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The problem of maintaining the H∞ norm of a standard closed loop below a prespecified tolerance level while maximizing an entropy integral (at a point in the right half plane) is posed and solved by way of the equivalent error system distance problem. All error systems with infinity norm below the tolerance level are parameterized as the linear fractional map of an all-pa... View full abstract»

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  • Matching zeros: a fixed constraint in multivariable synthesis

    Publication Year: 1988, Page(s):2060 - 2065 vol.3
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The model-matching equation (Tz)=P( z)M(z) induces constraints on the multivariate zero structures of P(z) and M( z), and the nature of the constraint is best explained by extending the usual notion of zero. In particular, the extended Γ-zero module of P(z) must contain as a submodul... View full abstract»

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  • Fields of extremals in linear-quadratic problems of optimal control

    Publication Year: 1988, Page(s):1173 - 1176 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The author presents necessary and sufficient conditions for optimality of extremals in linear-quadratic problems of optimal control. He shows by an example that when the second variation is only semipositive definite and extremals are still minimizers, the classical Riccati equation technique fails. The conditions obtained allow one to solve linear-quadratic problems with subsidiary conditions. An... View full abstract»

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  • The effects of delays on rank-one stabilizing controls in vibrating systems

    Publication Year: 1988, Page(s):112 - 113 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    Results are presented on the effect of small time delays which occur in the feedback of a class of infinite-dimensional vibrating systems whose uncontrolled versions are either conservative or uniformly damped. It is shown that conservative systems which are exponentially damped by feedback can be transformed into unstable systems if arbitrarily small time delays are introduced into the feedback. ... View full abstract»

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  • Preliminaries on almost-controlled invariance for single-input nonlinear systems

    Publication Year: 1988, Page(s):932 - 933 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The purpose of this study is to introduce a concept of almost-controlled invariant distributions of (single-input) nonlinear systems. The definition proposed is one of the equivalent characterizations of linear almost-controlled invariance. An approach for solving the almost disturbance decoupling problem for single-input-single-output nonlinear systems is given. Part of this method is essentially... View full abstract»

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