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Regulation Problem (regulation + problem)

Distribution by Scientific Domains
Engineering90%

Kinds of Regulation Problem

  • output regulation problem
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  • robust output regulation problem
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    Selected Abstracts

    Adaptive regulation of MIMO linear systems against unknown sinusoidal exogenous inputs

    INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Issue 6 2009
    Maurizio Ficocelli
    Abstract This paper deals with the adaptive regulation problem in linear multi-input multi-output systems subject to unknown sinusoidal exogenous inputs, where the frequencies, amplitudes, and phases of the sinusoids are unknown and where the number of sinusoids is assumed to be known. The design of an adaptive regulator for the system under consideration is performed within a set of Q -parameterized stabilizing controllers. To facilitate the design of the adaptive regulator, triangular decoupling is introduced in part of the closed-loop system dynamics. This is achieved through the proper selection of the controller state feedback gain and the structure of the Q parameter. Regulation conditions are then presented for the case where the sinusoidal exogenous input properties are known. For the case where the sinusoidal exogenous input properties are unknown, an adaptation algorithm is proposed to tune the Q parameter in the expression of the parameterized controller. The online tuning of the Q parameter allows the controller to converge to the desired regulator. Convergence results of the adaptation algorithm are presented. A simulation example involving a retinal imaging adaptive optics system is used to illustrate the performance of the proposed adaptive system. Copyright © 2008 John Wiley & Sons, Ltd. [source]

    Issues in the design of switched linear control systems: A benchmark study

    INTERNATIONAL JOURNAL OF ADAPTIVE CONTROL AND SIGNAL PROCESSING, Issue 2 2003
    D.J. Leith
    In this paper we present a tutorial overview of some of the issues that arise in the design of switched linear control systems. A benchmark regulation problem is then presented. Copyright © 2003 John Wiley & Sons, Ltd. [source]

    Global output regulation for output feedback systems with an uncertain exosystem and its application

    INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 15 2010
    Dabo Xu
    Abstract This paper presents the solvability conditions for the global robust output regulation problem for a class of output feedback systems with an uncertain exosystem by using output feedback control. An adaptive control technique is used to handle the unknown parameter vector in the exosystem. It is shown that this unknown parameter vector can be exactly estimated asymptotically if a controller containing a minimal internal model is employed. The effectiveness of our approach has been illustrated by an asymptotic tracking problem of a generalized fourth-order Lorenz system. Copyright © 2009 John Wiley & Sons, Ltd. [source]

    A feedforward,feedback controller for infinite-dimensional systems and regulation of bounded uniformly continuous signals

    INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 5 2006
    Eero Immonen
    Abstract We design a controller for infinite-dimensional linear systems (with bounded control, observation and feedthrough operators) which, under certain assumptions, achieves asymptotic tracking of arbitrary bounded uniformly continuous reference signals in the presence of disturbances. The proposed controller is of feedforward,feedback type: The dynamic feedback part is used to stabilize the closed-loop system consisting of the plant and the controller, whereas the feedforward part is tuned using the regulator equations to achieve the regulation of desired signals. We also completely solve the regulator equations for SISO systems, and we discuss robustness properties of the proposed controller. A useful feature in our design is that the feedforward part of the controller can be designed independently of the feedback part. This automatically leads to a degree of robustness in the stabilizing part of the controller, which is not present in the existing state feedback controllers solving the same output regulation problem. Copyright © 2006 John Wiley & Sons, Ltd. [source]

    Robust output regulation for discrete-time nonlinear systems

    INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 2 2005
    Weiyao Lan
    Abstract In this paper, we will establish a framework that can convert the robust output regulation problem for discrete-time nonlinear systems into a robust stabilization problem for an appropriately augmented system consisting of the given plant and a specific dynamic system called internal model. We then apply this framework to solve the local robust output regulation problem for a general class of discrete-time nonlinear systems. The results of this paper gives a discrete-time counterpart of the recent results on the continuous-time robust output regulation problem. Copyright © 2005 John Wiley & Sons, Ltd. [source]

    A position/force control for a robot finger with soft tip and uncertain kinematics

    JOURNAL OF FIELD ROBOTICS (FORMERLY JOURNAL OF ROBOTIC SYSTEMS), Issue 3 2002
    Zoe Doulgeri
    We consider the position and force regulation problem for a soft tip robot finger in contact with a rigid surface under kinematic and dynamic parametric uncertainties. The reproducing force is assumed to be related to the displacement through a nonlinear function whose characteristics are unknown, but both the actual displacement and force can be directly measured. Kinematic uncertainties concern the rigid surface orientation and the contact point location. Kinematic parameters involved in the contact point location concern the length from the last joint to the contact point and the rest of the link lengths in the general case. An adaptive controller with a composite update parameter law is proposed, and the asymptotic stability of the force and estimated position errors under dynamic and kinematic uncertainties is shown for the planar case. Simulation results for a three-degrees-of-freedom planar robotic finger are presented. © 2002 Wiley Periodicals, Inc. [source]

    On a robust synchronization problem via internal model approach,

    ASIAN JOURNAL OF CONTROL, Issue 1 2010
    Weijie Sun
    Abstract This paper formulates the synchronization of the Duffing system and the Van der Pol oscillator as a robust output regulation problem and presents the solution to this problem based on the internal model design. The controller thus obtained is able to achieve the synchronization of the outputs of these two systems in the presence of the parameter uncertainty of the Duffing system. Copyright © 2009 John Wiley and Sons Asia Pte Ltd and Chinese Automatic Control Society [source]

    VOLTAGE REGULATION OF A BUCK BOOST CONVERTER,A HYBRID CONTROL APPROACH

    ASIAN JOURNAL OF CONTROL, Issue 4 2007
    C. Sreekumar
    ABSTRACT In this paper, the output voltage regulation problem in a buck boost converter is defined as a hybrid control problem. For control design, the mutually interacting continuous and discrete dynamics are modeled as a hybrid automaton. Thus, the control problem is defined as a guard selection problem of the hybrid automaton. The system trajectory is switched between different modes based on the guards to achieve the required voltage regulation. The guards defined are fixed surfaces represented in terms of the state variables for a given operating condition. The logic-based switching in the state plane is stable in terms of the chaotic and bifurcation behavior. The effectiveness of the control scheme for buck and boost operation under line and load disturbances is demonstrated by simulation in the MATLAB-SIMULINK environment and the results are presented. [source]

    Output Regulation Of A Class Of Singular Nonlinear Systems With The Normal Output Feedback Controller

    ASIAN JOURNAL OF CONTROL, Issue 1 2003
    Wei Wang
    ABSTRACT Existing results for output regulation of singular nonlinear systems via normal output feedback control require the normalizability assumption. In this paper, we will show that, for a large class of singular nonlinear systems, it is possible to construct a normal output feedback control to solve the regulation problem without the normalizability assumption. The major result is illustrated by an example. [source]

    Output regulation of discrete-time linear plants subject to state and input constraints

    INTERNATIONAL JOURNAL OF ROBUST AND NONLINEAR CONTROL, Issue 8 2003
    Guoyong Shi
    Abstract Discrete-time output regulation of linear systems with state and/or input constraints on magnitude is considered. Structural properties of linear plants are identified under which the so-called constrained semi-global and global output regulation problems are solvable. As in the case of continuous-time systems, an important aspect of our development is a taxonomy of constraints showing a clear relationship between the constraint types and the output regulation results. Solvability conditions are developed for semi-global and global output regulation problems. Appropriate regulators are constructed for problems that are solvable. Copyright © 2003 John Wiley & Sons, Ltd. [source]

    Child ADHD and personality/temperament traits of reactive and effortful control, resiliency, and emotionality

    THE JOURNAL OF CHILD PSYCHOLOGY AND PSYCHIATRY AND ALLIED DISCIPLINES, Issue 11 2006
    Michelle M. Martel
    Background:, Models of attention-deficit/hyperactivity disorder (ADHD) suggest developmental influences may feed into components of the disorder separately from associated disruptive behavior problems. We investigated this in terms of key personality/temperament traits of Reactive and Effortful Control, Resiliency, and Emotionality. Methods:, A sample of 179 children (age 6,12, 63% boys), of whom 92 had ADHD, 52 were Controls, and 35 were borderline or not otherwise specified cases of ADHD, were examined. Dispositional trait scores were derived from parent-completed California Q-sort and the Early Adolescent Temperament Questionnaire. Child ADHD symptoms were evaluated using maternal structured diagnostic interview and teacher-completed symptom ratings. Results:, Traits were differentially associated with symptoms. Reactive Control was related to hyperactivity-impulsivity as rated by both parents and teachers. Negative Emotionality was related to oppositional-defiance. Resiliency was primarily related to inattention-disorganization as rated by both parents and teachers; Effortful Control was related uniquely to inattention in parent but not teacher data. A moderation effect emerged; the relationship between parent-rated Negative Emotionality and teacher-rated ADHD symptoms was stronger for children with high levels of both Reactive and Effortful Control. Conclusions:, Results are interpreted in relation to a two-pathway model of ADHD; regulation problems contribute to the emergence of symptoms of inattention-disorganization, reactive or motivational control problems to the emergence of hyperactivity-impulsivity, and these are distinct from negative affectivity. Children with regulation deficits and a reactive motivational style are especially at risk for the development of ADHD. [source]