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
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    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 (153)
    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
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    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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  • Intelligent control for computer integrated manufacturing

    Publication Year: 1988, Page(s):2314 - 2321 vol.3
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (436 KB)

    An intelligent machining controller is developed for cutting-force regulation of the peripheral milling process. This controller combines parameter adaptive control algorithms(s) with heuristic logic, which monitors the performance of the control algorithms. The development of knowledge and rule bases for intelligent control is discussed, and the resulting improvements in control performance are d... View full abstract»

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  • Multivariable control system synthesis based on the unknown-but-bounded disturbance model

    Publication Year: 1988, Page(s):1754 - 1759 vol.3
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (548 KB)

    Hard constraint bounding results are summarized along with additional new results. The authors derive bounds for the outputs and the states of systems disturbed either by uncertain inputs or modeling errors, using either boxes or ellipsoids as the constraint sets. The bounding results are summarized, based on either the concept of matrix measures or F.C. Schweppe's (1973) ellipsoidal bounds. The t... View full abstract»

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  • Evaluation of part-type mix for a machining workstation using generalized stochastic Petri nets

    Publication Year: 1988, Page(s):2307 - 2313 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (632 KB)

    A generalized stochastic Petri net (GSPN) model for a machining workstation controller is developed by using equivalent GSPN representations of controller place types. Performance measures such as the average production rates, the average time to produce a part and the machine utilization are computed as a function of part-type mix. It is shown that for certain part-type mixes, these performance m... View full abstract»

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  • Stability of asynchronous multirate linear systems

    Publication Year: 1988, Page(s):1691 - 1696 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (492 KB)

    The author develops a sufficient stability criterion for unsynchronized, multirate, sampled-data systems. Such hybrid systems include a linear, time-invariant plant and several unsynchronized digital controllers. The criterion, which is computed from eigenvalues and eigenvectors of the closed-loop state transition matrix, objectively describes long- and short-term stability. A simple example illus... View full abstract»

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  • Approximation for a neutral equation with nonatomic D operator

    Publication Year: 1988, Page(s):810 - 812 vol.1
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (212 KB)

    The author considers the problem of approximating the solution for a neutral equation that has a nonatomic D operator. It is shown that two different numerical schemes provide reasonably good approximations for scalar examples possessing the singular nature of the neutral equations that one wishes to solve numerically. The first method is a recurrence method while the second one uses fini... View full abstract»

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  • Frequency domain design for prespecified state and control constraints under persistent bounded disturbances

    Publication Year: 1988, Page(s):1748 - 1753 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (480 KB)

    A frequency domain procedure for synthesizing controllers for single-input, single-output systems satisfying state and control constraints in the presence of persistent bounded input disturbances is presented. The input disturbance is modeled as an unknown but bounded process. The state and control constraints are treated explicitly. The primary objective is to construct a controller that: (1) use... View full abstract»

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  • Fault detection and diagnosis of automated manufacturing systems

    Publication Year: 1988, Page(s):2301 - 2306 vol.3
    Cited by:  Papers (27)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (492 KB)

    The authors develop a controller methodology for fault detection and diagnosis using Petri nets and fault trees in automated manufacturing systems. The controller has two levels. At the first level there are dedicated diagnostic systems for each of the subsystems, such as machine centers, robots, conveyers, etc. At the second level there is an intelligent controller monitoring the part flow and co... View full abstract»

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  • Parameter convergence in the stochastic gradient adaptive control law

    Publication Year: 1988, Page(s):1211 - 1212 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (128 KB)

    The authors exhibit self-tuning results for the adaptive control law proposed by G.C. Godwin, P.J. Ramadge and P.E. Caines (SIAM J. Control Optim., vol.19, no.6, p.829-53, 1981). They also show how the dimension of the adaptive control law can be reduced in situations where the reference trajectory has a low order of excitation. The results are compared with an adaptive control law proposed by P.R... View full abstract»

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  • The Wiberg estimator: continuous-time case

    Publication Year: 1988, Page(s):845 - 850 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (444 KB)

    The continuous-time optimal nonlinear filter for online parameter estimation is approximated by its first three moments and the Gaussian formula for fourth-order moments. Equations are developed for the general case in continuous time, including pole, zero, and variance parameters. Comparison is made to the recursive prediction error method in continuous time. Simulations are developed for estimat... View full abstract»

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  • Singular values and vectors of a class of Hankel operators

    Publication Year: 1988, Page(s):1366 - 1369 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (304 KB)

    The author considers the problem of determining the singular values and vectors of the class of Hankel operators whose symbol can be written in the form φ*W, where φ is inner and W is rational. He obtains a new and simplified proof of the fact that the zeros of a certain determinantal expression coincide with the Hankel singular values. The author also shows how this expr... View full abstract»

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  • A new algorithm for multirate digital control law synthesis

    Publication Year: 1988, Page(s):1685 - 1690 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    A novel algorithm for multirate digital control law synthesis is presented. The algorithm accommodates a generalized controller structure, and all sampling rates for sensor sample-and-hold circuits, digital processor circuits, and control sample-and-hold circuits can be chosen independently. The algorithm uses a gradient-type numerical search to determine the controller matrices so that a finite-t... View full abstract»

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  • Quasi-Newton methods for parameter estimation in functional differential equations

    Publication Year: 1988, Page(s):806 - 809 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (252 KB)

    A state-space approach to parameter estimation in linear functional differential equations is developed using the theory of linear evolution equations. A locally convergent quasi-Newton type algorithm is applied to distributed systems with particular emphasis on parameters that induce unbounded perturbations of the state. The algorithm is computationally implemented on several functional different... View full abstract»

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  • On minimizing maximum errors

    Publication Year: 1988, Page(s):1746 - 1747 vol.3
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (124 KB)

    The authors show how an interesting problem recently formulated using ellipsoidal set-theoretic control synthesis techniques can be formulated and solved using l1 optimal control theory. This furnishes a complete solution to the problem and avoids the difficulties of parameter optimization View full abstract»

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