Browsing by Subject "Control Systems, Adaptive"

Now showing items 1-20 of 27

    • Article  

      Accommodation of Failures in the F-16 Aircraft Using Adaptive Control 

      Ahmed-Zaid, F.; Ioannou, Petros A.; Gousman, K.; Rooney, R. (1991)
    • Conference Object  

      Accomodation of failures in the flight control system of the F-16 aircraft using adaptive control 

      Ahmed-Zaid, F.; Ioannou, Petros A.; Gousman, K.; Rooney, R. (Publ by American Automatic Control Council, 1990)
      The effect of surface and hardware failure on the flight control system of the F-16 fighter aircraft is examined. In the absence of failures and unpredictable changes, the controller, which is based on gains scheduling, ...
    • Article  

      Adaptive Control of Linear Time-Varying Plants: A New Model Reference Controller Structure 

      Tsakalis, Kostas S.; Ioannou, Petros A. (1989)
      In this paper we study the problem of developing a control law which can force the output of a linear time-varying plant to track the output of a stable linear time-invariant reference model. We first show that the standard ...
    • Article  

      Adaptive control of time‐varying plants: Simple examples 

      Tsakalis, Kostas S.; Ioannou, Petros A. (1988)
      The design and properties of an adaptive model reference scheme and an adaptive pole placement control scheme for linear time‐varying plants are demonstrated via two simple examples. The two new schemes combine new control ...
    • Conference Object  

      Convergence analysis for a class of neural networks 

      Polycarpou, Marios M.; Ioannou, Petros A. (Publ by IEEE, 1992)
      Summary form only given, as follows. The authors consider the convergence issue that arises in the application of backpropagation algorithms in a special class of neural network architectures, referred to as structured ...
    • Article  

      Decentralized indirect adaptive control of interconnected systems 

      Datta, Aniruddha; Ioannou, Petros A. (1991)
      Continuous time decentralized indirect adaptive controllers are proposed for a large‐scale system composed of N interconnected linear subsystems with unknown parameters. Each local adaptive law utilizes a normalizing signal ...
    • Conference Object  

      Decentralized indirect adaptive control of interconnected systems 

      Datta, Aniruddha; Ioannou, Petros A. (Publ by American Automatic Control Council, 1990)
      Continuous-time decentralized indirect adaptive controllers are proposed for a large-scale system composed of N interconnected linear subsystems with unknown parameters. Each local adaptive law utilizes a normalizing signal ...
    • Article  

      Dominant richness and improvement of performance of robust adaptive control 

      Ioannou, Petros A.; Tao, G. (1989)
      Several recent robust adaptive control schemes guarantee stability and residual tracking errors which are "small" in the mean for any bounded initial conditions, independent of any persistence of excitation condition. Since ...
    • Conference Object  

      Instability analysis and robust adaptive control of robotic manipulators 

      Reed, John S.; Ioannou, Petros A. (Publ by IEEE, 1988)
      The robustness of adaptive controllers with respect to uncertainty is examined. The uncertainties include bounded input disturbances, unknown and time-varying plant parameters, and unmodeled dynamics. A simple example shows ...
    • Conference Object  

      Model reference adaptive control for plants with unknown relative degree 

      Tao, G.; Ioannou, Petros A. (Publ by IEEE, 1989)
      One of the basic assumptions in stable model reference adaptive control is that the relative degree n* of the modeled part of the plant is known exactly and matches that of the reference model. The authors relax this ...
    • Conference Object  

      MRAC for multivariable plants with zero residual tracking error 

      Tao, G.; Ioannou, Petros A. (Publ by IEEE, 1989)
      In almost all model-reference adaptive control (MRAC) schemes proposed in the literature the tracking error cannot be guaranteed to go to zero in the presence of plant unmodeled dynamics and/or bounded disturbances. It is ...
    • Conference Object  

      New indirect adaptive control scheme for time-varying plants 

      Tsakalis, Kostas S.; Ioannou, Petros A. (Publ by IEEE, 1988)
      An indirect adaptive control scheme for linear time-varying plants is presented which guarantees the closed-loop stability and exact tracking of a class of reference input signals. By incorporating any a priori available ...
    • Article  

      A New Indirect Adaptive Control Scheme for Time-Varying Plants 

      Tsakalis, Kostas S.; Ioannou, Petros A. (1990)
      An indirect robust adaptive controller designed for linear time-invariant plants may also meet its control objective approximately for slowly time-varying plants. The plant parameter variations act as a disturbance in the ...
    • Conference Object  

      Parameter convergence of modified adaptive laws with persistent excitation 

      Ioannou, Petros A.; Sun, Jing (Publ by American Automatic Control Council, 1990)
      The effect of σ-modification on the parameter convergence and stability properties of two different adaptive laws is analyzed. It is shown that σ-modification does not alter the ideal convergence properties of the adaptive ...
    • Conference Object  

      Persistency of excitation and overparameterization in model reference adaptive control 

      Tao, G.; Ioannou, Petros A. (Publ by IEEE, 1988)
      It is shown that if a model-reference adaptive controller is designed for an overparameterized plant, the persistence of excitation of the measured vector signal in the adaptive loop will be lost independently of the number ...
    • Article  

      Persistency of excitation and overparametrization in model reference adaptive control 

      Tao, G.; Ioannou, Petros A. (1990)
      In an overparametrized model reference adaptive control system, the measured signal (t) cannot be persistently exciting (PE) for any bounded reference input r(t). The controller parameter vector for model-plant transfer ...
    • Article  

      Reply to 'Comments on the robust stability analysis of adaptive controllers using normalizations' by P. P. Khargonekar and R. Ortega 

      Ioannou, Petros A. (1990)
      The author addresses a statement in the above-titled paper (ibid., vol. 34, no. 4, P. 478, Apr. 1989) that the proofs in four earlier papers, including two of which he is a coauthor, failed to establish that the proposed ...
    • Article  

      Robust adaptive control of bilinear plants 

      Tao, G.; Ioannou, Petros A. (1989)
      A robust model reference adaptive control scheme for bilinear plants with bounded disturbances is developed. Global stability of the closed-loop adaptive system is guaranteed by using a switching-a- modified adaptive law. ...
    • Article  

      Robust adaptive control of plants with unknown order and high frequency gain 

      Tao, G.; Ioannou, Petros A. (1991)
      An adaptive control scheme is presented which has a simple structure and guarantees global stability of the closed-loop plant and asymptotic zero tracking error for a class of reference signals. The plants to be controlled ...
    • Article  

      Robust adaptive control-a modified scheme 

      Tao, G.; Ioannou, Petros A. (1991)
      A normalizing signal that does not require the knowledge of the stability margin of the unmodelled dynamics is used in robust model reference adaptive control (MRAC) for plants with an enlarged class of unmodelled dynamics. ...