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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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  • 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
  • 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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  • State feedback for nonlinear continuous-time systems: stabilization and the creation of invariant subspaces

    Publication Year: 1990, Page(s):3390 - 3395 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    A theory of static state feedback for multivariable continuous-time nonlinear systems is formulated. The theory applies to systems described by differential equations of the form x˙(t)=f(x(t),u(t)). The basic objective is to design static state feedback compensators such that the state-space trajectory of the closed-loop system is confined within a specified subspace, and the closed-loop syste... View full abstract»

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  • On global stabilization of cascaded nonlinear systems

    Publication Year: 1990, Page(s):3388 - 3389 vol.6
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The problem of global smooth stabilization of cascade compositions of nonlinear globally asymptotically stable systems is studied. Global stabilization can be achieved if the first system can be rendered passive for an output that spans the unstable part of the vector field of the second system. This result generalizes earlier stabilizability conditions for the case when the first system is linear... View full abstract»

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  • Approximate filters for a nonlinear discrete time filtering problem with small observation noise

    Publication Year: 1990, Page(s):778 - 783 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The asymptotic behavior is studied of a nonlinear one-dimensional filtering discrete time problem, as some parameter ∈ tends to 0. The case is treated of a nonlinear discrete time problem coming from a continuous time one with small observation noise, the step time discretization being equal to the intensity of this noise. A finite dimensional approximate filter is proposed, and results conce... View full abstract»

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  • Nonlinear noninteracting control with stability: a high gain control approach

    Publication Year: 1990, Page(s):3385 - 3387 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (260 KB)

    The problem of designing a controller to render a class of nonlinear systems simultaneously noninteractive with asymptotically stable fixed modes is addressed. It is shown that for a nonlinear system with unstable fixed dynamics (nonminimum phase system) where there exists no dynamic state feedback which could render the closed-loop system noninteractive and stable, a high-gain dynamic control str... View full abstract»

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  • Properties of the ML(n) policy for scheduling jobs with real-time constraints

    Publication Year: 1990, Page(s):915 - 920 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The behavior of two policies for scheduling customers with deadlines until the beginning of service onto multiprocessors is studied. Both policies attempt to approximate the performance of the minimum laxity (ML) scheduling policy without incurring its complete overhead. This is accomplished by dividing the queue into two queues-one, of maximum size n>0, managed using the minimum laxit... View full abstract»

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  • An expert system-based supervisor in real-time control

    Publication Year: 1990, Page(s):1519 - 1524 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Artificial intelligence and expert systems techniques, coupled with historical signal analysis and optimization methods, provide a novel approach to monitoring process dynamics and performance and learning knowledge about how to do a production job better based on past experience. An expert system-based supervisor is proposed to provide such a tool for a simple tank level control problem which adj... View full abstract»

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  • Parameter identification for nonlinear systems

    Publication Year: 1990, Page(s):772 - 777 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    Preliminary results from an investigation into identification of parameters appearing nonlinearly in system dynamics are presented. After presentation of background material on identifiability of such systems, an identifier based on the extended Luenberger observer is constructed for a class of nonlinear systems. Conditions sufficient for global convergence of its parameter estimates are discussed... View full abstract»

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  • A distributed asynchronous algorithm for expected average cost dynamic programming

    Publication Year: 1990, Page(s):1394 - 1395 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    A distributed asynchronous implementation of the value-iteration algorithm in dynamic programming is presented. The iteration step is carried out by a number of processors, each iterating on a subset of the value function vector. Each processor transmits its computed coordinates to other processors. The algorithm converges when the different processors iterate at different speeds. The information ... View full abstract»

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  • Robust car steering by yaw rate control

    Publication Year: 1990, Page(s):2033 - 2034 vol.4
    Cited by:  Papers (33)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    It is shown that feedback control can improve the robustness of the driver-car system with respect to uncertain operating conditions. Robustness is achieved by controlling the yaw rate instead of the steering angle. Integrating unit feedback of the yaw rate error makes the yaw mode unobservable from the front axle lateral acceleration and thereby take uncertainty out of the steering transfer funct... View full abstract»

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  • On the existence of solutions in adaptive control

    Publication Year: 1990, Page(s):2720 - 2721 vol.5
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (164 KB)

    The existence and uniqueness of solutions in model reference adaptive control are established by considering the closed loop equations. Certain circular arguments or unnecessary assumptions that arise when only the open loop structure is considered are avoided View full abstract»

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  • On a parameterization of all stabilizing controllers for plants with parametric uncertainty

    Publication Year: 1990, Page(s):1210 - 1216 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    A parametrization of all (internally) stabilizing controllers for SISO plants characterized by parametric uncertainty is obtained. The case of a single uncertain parameter is analyzed, and necessary and sufficient conditions for robust stability are derived. The results suggest the possibility of using this approach for synthesis of controllers for uncertain plants. The conditions in the multipara... View full abstract»

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  • Nonparametric identification of a particular nonlinear time series system

    Publication Year: 1990, Page(s):216 - 217 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (156 KB)

    A nonlinear time series system of cascade structure is identified. The system consists of a nonlinear memoryless element followed by a dynamic linear subsystem. Given a color Gaussian input, the Hermite polynomials based method for recovering the system nonlinearity is presented. The algorithm is carried out by solving an integral equation related to the identification problem. The consistency alo... View full abstract»

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  • Robust stabilization of nonlinear plants via left coprime factorizations

    Publication Year: 1990, Page(s):3379 - 3384 vol.6
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The authors describe steps toward the development of a robust stabilization theory for nonlinear plants. An approach using the left coprime factorizations of the plant and controller under certain differential boundedness assumptions is used. Attention is focused on a characterization of the class of all stabilizing nonlinear controllers KQ for a nonlinear plant G, par... View full abstract»

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  • A neural network compensator for uncertainties of robotic manipulators

    Publication Year: 1990, Page(s):3303 - 3307 vol.6
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The authors propose neural networks which do not learn inverse dynamic models but compensate nonlinearities of robotic manipulators by the computed torque method. A comparison of the performance of these networks with that of the conventional adaptive scheme in compensating the unmodeled effects was carried out. As a result, the adaptive capability of the neural network controller with respect to ... View full abstract»

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  • Stochastic convexity for multidimensional processes

    Publication Year: 1990, Page(s):909 - 914 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A multidimensional stochastic process is considered which is a function of a parametric process. The parametric process may be multidimensional as well. Two such processes that differ only in their parametric processes are compared. The known stochastic convexity results for one-dimensional stochastic processes, which were developed by M. Shaked and J.G. Shanthikumar (1988), are extended to multid... View full abstract»

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  • Easy synchronized Petri nets as discrete event models

    Publication Year: 1990, Page(s):2839 - 2844 vol.5
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Linguistic concepts are introduced to relate Petri net models with the control theory for discrete event systems. Petri net structures can be considered as language generators, and different languages associated with them are examined. An important operator, synchronization, is introduced and its counterpart on a Petri net structure is studied. Finally, the authors introduce the concept of easines... View full abstract»

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  • A machine learning approach to intelligent adaptive control

    Publication Year: 1990, Page(s):1513 - 1518 vol.3
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    An attempt to define intelligent adaptive control is presented. It is noted that it might denote a more flexible redesign capability of the control system. For example, suppose the control engineer himself remains in the `outer' loop. After observing deficiencies in his first attempt at a control system, he might design a replacement that better reflects the eccentricities of the underlying proces... View full abstract»

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  • Characterization of discrete time H controllers via bilinear transformation

    Publication Year: 1990, Page(s):1763 - 1768 vol.3
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    A unified state space approach using bilinear transformation is proposed for continuous/discrete time H optimal control problems. It is shown that Riccati equations and related factorizations of continuous time and discrete time systems can be formulated by the same Hamiltonian matrices. All H sub-optimal compensators for continuous and discre... View full abstract»

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  • An extreme point result for robust stability of a diamond of polynomials

    Publication Year: 1990, Page(s):37 - 38 vol.1
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (208 KB)

    The main result of this study is that a family of polynomials with real coefficients lying in a diamond is Hurwitz if and only if eight distinguished extreme polynomials are Hurwitz. For the case of complex coefficients, it is shown via counterexample that no analogous extreme point result holds View full abstract»

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  • Finite time observers and observability

    Publication Year: 1990, Page(s):770 - 771 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    A notion of finite time observer for partially observed deterministic control systems is introduced. The observer dynamics are given by a Hamilton-Jacobi equation, and the observer is consistent under a natural observability condition. An observability grammian for nonlinear systems is introduced, and is used to study the time evolution of sets of indistinguishable points View full abstract»

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  • Another approach to long-range predictive control

    Publication Year: 1990, Page(s):1391 - 1393 vol.3
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB)

    A long-range predictive control based on a quadratic cost function is developed. The controlled system is described by an input-output model and, in order to compute the control gain matrix via the solution of a discrete-time Riccati equation, a state-space equation is formulated through a partitioned output prediction-block representation of the system. Extension to the infinite horizon case is p... View full abstract»

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  • A framework for 2D hyperstability theory based provably convergent adaptive 2D IIR filtering

    Publication Year: 1990, Page(s):3254 - 3255 vol.6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    A set of results for 2D quarter plane causal systems reminiscent of 1D hyperstability theory is reported. The key to this development is a little-known spectral factorability type 2D result of E. Landau (1906). The tools used are largely based on notions of passivity. An adaptive 2D recursive filtering scheme potentially useful in propagating-wave-type 2D problems is considered, and it is shown vi... View full abstract»

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