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Decision and Control, 1988., Proceedings of the 27th IEEE Conference on

Date 7-9 Dec. 1988

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Displaying Results 1 - 25 of 536
  • Proceedings of the 27th IEEE Conference on Decision and Control (IEEE Cat. No.88CH2531-2)

    Publication Year: 1988
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    Freely Available from IEEE
  • Robustness of flexible structures against small time delays

    Publication Year: 1988 , Page(s): 1647 - 1648 vol.2
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | 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 is easily checked.<> View full abstract»

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  • Stable distributed real-time scheduling of flexible manufacturing/assembly/disassembly systems

    Publication Year: 1988 , Page(s): 1863 - 1865 vol.3
    Cited by:  Papers (3)
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    The authors propose a dynamic model of the manufacturing environment which allows a real-time, distributed approach to scheduling. They first consider a single machine, and then they consider an interconnection of machines called a distributed clear-a-fraction policy which results in an acyclic system such as a flow shop. Finally, they treat a general manufacturing system with no restrictions on interconnections, using a clear-a-fraction policy with backoff, which can be shown to be stable View full abstract»

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  • Factorization of nonlinear systems: toward a theory for nonlinear H control

    Publication Year: 1988 , Page(s): 2376 - 2381 vol.3
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (472 KB)  

    A natural approach to H control for nonlinear systems, by developing a theory of factorization for a nonlinear time-invariant causal map, is presented. Whenever such factorizations exist with well-behaved frequency-response function, θ, then a substantial class of nonlinear control problems can be solved. The author reports progress toward developing state-space formulas for constructing θ that generalize formulas of J.A. Ball and A. Ran (1987), which are the discrete-time version of Glover's equations View full abstract»

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  • Stability robustness of linear feedback-controlled mechanical systems in the presence of a class of unmodelled flexibilities

    Publication Year: 1988 , Page(s): 114 - 116 vol.1
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (176 KB)  

    The author considers a class of linear mechanical systems containing flexible elements and subject to linear, memoryless, output-feedback controllers. The damping and stiffness properties of some of the flexible elements are parameterized linearly in μ-1 and μ-2, respectively, where μ>0 and these components become more rigid as μ approaches zero. If a controller stabilizes a system model in which these components are assumed rigid, then it also stabilizes the model in which these components are flexible, provided μ is sufficiently small. The results are illustrated by an example View full abstract»

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  • Some properties of dynamic feedback neural nets

    Publication Year: 1988 , Page(s): 337 - 342 vol.1
    Cited by:  Papers (20)
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    The authors present models of feedback neural nets which are described by nonlinear differential equations. They show that their earlier proofs for convergence to bounded regions and for the existence of a finite number of equilibria are independent of the symmetry of the interconnection matrix and thus are also applicable to more general nongradient dynamic neural nets. However, when the interconnect matrix is asymmetric, the network is not guaranteed to have only (finite) equilibria as its limit set. The authors present computer simulations of a three-neuron network which demonstrate the coexistence of two stable equilibria within the same quadrant. The three-neuron example hence contradicts a recent theorem in the literature View full abstract»

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  • Global bifurcation analysis of an adaptive control system

    Publication Year: 1988 , Page(s): 317 - 322 vol.1
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    The authors present a complete bifurcation analysis of a two-parameter, two-dimensional quadratic ODE (ordinary differential equation) which arises in the study of model reference adaptive control systems. The 2-D ODE exhibits saddle-node, (subcritical) Hopf, and saddle-loop bifurcations. The authors are able to describe the bifurcation diagram completely by identifying all the bifurcation curves. All but the saddle-loop bifurcation curves are explicitly characterized. The saddle-loop bifurcation curve, however, is described qualitatively, and its endpoints as well as its relative position are identified 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
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    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. In the case of uniformly damped systems it can sometimes happen that a feedback which enhances stability can induce periodic or even exponentially unbounded solutions if arbitrarily small time delays are introduced into it View full abstract»

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  • Optimal trajectories which contain singular arcs

    Publication Year: 1988 , Page(s): 2382 - 2386 vol.3
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    Classically, the optimality of bang-bang trajectories and singular arcs have been studied separately. However, for most problems in optimal control it is necessary to consider trajectories which combine them. The author presents the basic problem, along with some preliminary observations and results. He first formalizes, for an analytic system, one way to organize singular extremals in the cotangent bundle. He then considers the concatenation of bang and singular arcs, giving an example of how to obtain structure results in a degenerate but still generic case in dimension three View full abstract»

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  • Complete results for a class of state feedback disturbance attenuation problems

    Publication Year: 1988 , Page(s): 1349 - 1353 vol.2
    Cited by:  Papers (4)
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    The author considers a problem of disturbance attenuation using full state feedback. The particular class of linear systems under state feedback is closely related to the so-called one-block problem in H control. He gives a complete solution to this problem in terms of a certain algebraic Riccati equation View full abstract»

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  • Discrete event systems with real-time constraints: modeling and sensitivity analysis

    Publication Year: 1988 , Page(s): 220 - 225 vol.1
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (648 KB)  

    The authors present a model for timed discrete-event systems (DES) that includes conditioned event, a situation arising in the presence of real-time constraints. Based on this model, an augmented system approach is developed to determine conditions for constructing perturbed simple paths of such a DES, given only a nominal sample path. A queueing system with real-time constraints is then considered, where jobs are accepted into a service facility with threshold-based access control and are lost if their waiting time exceeds a given deadline. An augmented system model is constructed to estimate performance sensitivities online with respect to the threshold parameter. It is shown that this approach provides consistent estimates of these sensitivities under certain conditions, and explicit procedures for obtaining these estimates are presented 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
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    Summary form only given. An adaptive l1 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 l1 optimal controller has been constructed to minimize the effect of this error on the output. It has been shown that under reasonable assumptions an adaptive controller can be based on the l1 design strategy, and the result is a globally convergent adaptive scheme View full abstract»

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  • A neural network architecture for cue-based motion planning

    Publication Year: 1988 , Page(s): 324 - 327 vol.1
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    The principles of memory organization of plans are presented, and the role of sensory cues in the timely selection and execution of plans is demonstrated. The two major components of learning a cue-based plan, developing the ability to detect cues and associating cues with the relevant responses, are described. The preliminary development of neural-network mechanisms for learning cue-based plans is presented. It is shown that hard-wired neural networks provide the input to adaptive neural networks that learn an internal representation of the relevant cues and the threshold levels associated with them. Self-organizing neural networks learn to associate cues with changes in action and to construct cue-based plans View full abstract»

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  • Time-scale structure assignment in linear multivariable systems by high-gain feedback

    Publication Year: 1988 , Page(s): 423 - 430 vol.1
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (724 KB)  

    A systematic design method of assigning a required time-scale structure to a given multivariable system is developed. The time-scale structure assignment is done by high-gain feedback of either state or output. The method decomposes a given multivariable system into several single-input, single-output (SISO) subsystems each of which is designed separately. A standard method of design for SISO system is developed, and this forms a building block for multivariable system design. The state-feedback design depends only on the stage sequence of the given system, while the output feedback design depends only on the set of integers which specifies the order of infinite zeros. In this way the design is made robust with respect to certain parameter uncertainties View full abstract»

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  • The algebraic Riccati equation and the singular control problem

    Publication Year: 1988 , Page(s): 2387 - 2389 vol.3
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    The author bridges some gaps between the geometric theory of the matrix Riccati equation and the optimality properties of linear systems with quadratic cost. The theory provides proofs for some classical variational inequalities. An application of the theory that is relevant for the quadratic regulator problem is given View full abstract»

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  • Robust stabilization of discrete time, single input single output, linear time varying systems

    Publication Year: 1988 , Page(s): 39 - 44 vol.1
    Cited by:  Papers (3)
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    The authors describe the notion of a generalized stability region, which turns out to be of great importance in checking the stability of a time-varying system. A scheme to stabilize families of linear time-varying systems simultaneously and robustly by a linear time-varying dynamic compensator which generalizes results in time-variant system theory is also derived View full abstract»

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  • The predictability of discrete event systems

    Publication Year: 1988 , Page(s): 198 - 202 vol.1
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    The author formulates the trajectory prediction problem by using automaton and language theory. He shows that the automaton method and the perturbation analysis method, which have been developed independently and so far appear to have little relation to each other, can support each other: the former can be used to formulate formally the concept of the latter, and the latter provides an application area for the former. The author defines the predictability of the trajectories of a DES (discrete-event system) based on the trajectories of another DES. The predictability is explained by the projection of a language onto another language. Examples are given to show the application of this concept. It is concluded that the concept introduced here can be viewed as an extension of the controllability and observability theory of DES as well as a generalization of the perturbation analysis theory View full abstract»

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  • Least squares parameter identification of nonlinear differential I/O models

    Publication Year: 1988 , Page(s): 1831 - 1835 vol.3
    Cited by:  Papers (4)
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    A least-squares parameter identification technique is formulated for deterministic systems modeled by a class of input-output nonlinear differential operator equations. Based on the notion of exactness in the calculus, a distinction is made on the basis of whether or not the equation error representation is an exact differential expression. It is shown how equation error models which are exact can be integrated for any given input-output data pair to yield and explicit function of the parameters that can be used for standard least-squares-estimation techniques. The formulation is then extended to apply to a class of inexact equation error system models. Also discussed is the notion of `identifiability' as it relates to the class of systems under consideration View full abstract»

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  • Stability and convergence of multipredictor adaptive controllers

    Publication Year: 1988 , Page(s): 1945 - 1946 vol.3
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    The authors deal with global stability and convergence of multipredictor adaptive control algorithms. The algorithms considered are of long-range type, made up by a bank of T separate parallel identifiers, all sharing a common regressor. This feature reduces the computation time and, together with the assumed knowledge of the first T samples of the plant impulse response, makes the analysis possible. Though the first T impulse response samples are assumed known, the numerator and denominator polynomials of the plant transfer function are unknown and are allowed to have marginally stable common factors, modeling the presence of bounded deterministic (recurrent) disturbances. The approach is based on directional forgetting recursive least squares View full abstract»

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  • Approximate stochastic models

    Publication Year: 1988 , Page(s): 1928 - 1929 vol.3
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    The problem of representing a stationary stochastic process y with a low-dimensional stochastic model is considered. This problem occurs when the state space of an exact realization of y has very large dimension. The reduction is obtained in this large state space, exploiting its Markovian structure to characterize all Markovian subspaces, among which a reduced k-dimensional model is sought. An algorithm with polynomial complexity to compute the approximate model is given 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 (7)
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    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-pass matrix and an arbitrary stable contraction. The authors derive the maximum entropy choice for the contraction and a value for the maximum entropy. For the maximum entropy at infinity, it is proved that the arbitrary contraction must be set to zero (the central solution); the maximum entropy in this case is an explicit formula in terms of the realization of the error system. Some motivational remarks are made, and links between entropy, H2 norms and H2 optimal control are given View full abstract»

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  • On-board sensor failure detection of an active suspension system using the generalized likelihood ratio approach

    Publication Year: 1988 , Page(s): 2358 - 2363 vol.3
    Cited by:  Papers (2)
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    The authors extend the application of the generalized likelihood ratio (GLR) approach for on-board sensor failure detection and identification (FDI) of an active suspension system using a half-car (bicycle) model. It is assumed that the control design allows for one accelerometer and two linear variable differential transformers. The failures considered are bias and increased sensor noise. The advantages and limitations of the GLR approach in locating the failed sensor and in detecting different types of failures are assessed. It is concluded that the application of this approach is feasible when the failure can be modeled as a deterministic additive term. In other situations the computational requirements make it less practical View full abstract»

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  • Dynamical logic observers for finite automata

    Publication Year: 1988 , Page(s): 226 - 233 vol.1
    Cited by:  Papers (15)
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    A state estimation problem is formulated for a partially observed input-state-output (I-S-O) automaton, and the concept of a dynamical (default) logic observer is introduced. The state estimation problem is posed in terms of (i) the problem of constructing a classical dynamical system (CDS) which generates a sequence of state estimates, and (ii) the problem of the construction of a dynamical logic system (DLS) which generates a sequence of propositions that correctly describe properties of the state of the automaton. A simple illustrative example is presented in which a classical dynamical observer and a dynamical logic observer are constructed to solve the observation problem for a partially observed automaton View full abstract»

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  • Robust adaptive controllers with adaptation on the sampling rate

    Publication Year: 1988 , Page(s): 303 - 304 vol.1
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    Adaptation of sampling rate online is suggested to ensure robust stability and achieve specified performance. The adaptation rule is based on robust criteria which give the measure of the gain of the adaptive controller and the magnitude of modeling error. It is assumed that there exist unmodeled dynamics in the chosen identification model structure View full abstract»

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  • Sensitivity of expected survival value to the attacker's perception of defense capabilities

    Publication Year: 1988 , Page(s): 2437 - 2441 vol.3
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    Separated targets of differing values subject to a simultaneous attack are considered. The area defenses considered have: (a) impact point prediction (IPP) and full coordination, or (b) no IPP and partial (or full) coordination. The offense anticipates best defense within capabilities and attacks to minimize expected total survival value. The authors examine the sensitivity of results to the attacker's perception of defense capabilities View full abstract»

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