Authors:
Wassim M. Haddad,
Tomohisa Hayakawa,
Volume: 1, Page 2419 Paper number 72
Abstract:
A direct adaptive nonlinear control framework for multivariable nonlinear
uncertain systems with exogenous L_2 disturbances is developed. The
proposed framework is Lyapunov-based and guarantees partial asymptotic
stability of the closed-loop system; that is, asymptotic stability
with respect to part of the closed-loop system states associated with
the plant, as well as a nonexpansivity constraint on the closed-loop
input-output map. Finally, an illustrative numerical example is provided
to demonstrate the efficacy of the proposed approach.
Authors:
Bret T. Costic,
Darren M. Dawson,
Marcio S. de Queiroz,
Vikram Kapila,
Volume: 1, Page 2424 Paper number 1094
Abstract:
The main problem addressed in this paper is the quaternion-based, attitude
tracking control of rigid spacecraft without angular velocity measurements
and in the presence of an unknown inertia matrix. As a stepping-stone,
we first design an adaptive, full-state feedback controller that compensates
for parametric uncertainty while ensuring asymptotic attitude tracking
errors. The adaptive, full-state feedback controller is then redesigned
such that the need for angular velocity measurements is eliminated.
The proposed adaptive, output feedback controller ensures asymptotic
attitude tracking.
Authors:
Li Xu,
Bin Yao,
Volume: 1, Page 2430 Paper number 2173
Abstract:
In order to improve the overall contouring performance, it appears
that it is no longer possible to neglect dynamic coupling phenomena
that occur during contour tracking, especially for linear motor systems
which often move at high speed. This paper studies the high performance
contour tracking control of linear-motor-driven tables. The table dynamics
is first transformed into a task coordinate frame. A discontinuous
projection based adaptive robust controller (ARC) which explicitly
takes into account the dynamic coupling effect is constructed to improve
the contouring performance under both parametric uncertainties and
uncertain nonlinearities. A desired compensation ARC scheme is also
presented, in which the regressor is calculated using desired contour
information only. Both schemes are implemented and compared on a linear-motor-driven
X-Y table.
Authors:
Tri-Tan Van Cao,
Ley Chen,
Fangpo He,
Karl Sammut,
Volume: 1, Page 2436 Paper number 9166
Abstract:
A new tuning method for active vibration absorber design is presented
in this paper. A robust, adaptive control scheme based on a variable
structure with an adaptive discontinuity surface is designed and simulated.
Robust synthesis of an adaptive discontinuity surface based on an augmented
state-space is discussed. The proposed tuning scheme has three superior
features compared with the existing counterparts in that: (i) it is
completely insensitive to changes in the stiffness and damping of the
absorber, (ii) it is capable of suppressing cyclic vibrations over
a wide range of frequencies, (iii) its real-time operation requires
only one adjustable gain.
Authors:
Kenichi Hamamoto,
Takahiro Fukuda,
Toshiharu Sugie,
Volume: 1, Page 2438 Paper number 1874
Abstract:
In this paper, we present a two-degree-of-freedom controller tuning
for two-mass spring systems with friction based on the IFT (Iterative
Feedback Tuning) approach. While two-mass spring systems are widely
used, they sometimes have severe friction. In such a case, the existing
IFT methods may not work very well because they heavily rely on the
linearity of the plants. In order to cope with such cases, we adopt
two strategies. One is the separate tuning of the feedback and feedforward
controller. The other is to introduce a quasi-Newton method into a
parameter renewal law. The effectiveness of the proposed method is
demonstrated through numerical simulations and an experiment.
Authors:
Beno^it Codrons,
Xavier Bombois,
Michel Gevers,
Gérard Scorletti,
Volume: 1, Page 2444 Paper number 1636
Abstract:
This paper presents the application of our recently developed theory
on model validation for control and controller validation in a Prediction
Error framework to a realistic industrial case study. The industrial
application, taken from a paper by Ingason Jonsson (1998), concerns
the control of the silicon concentration in a ferrosilicon production
process. Our case study produces findings about the design of the
validation experiment (validation in open or closed loop). It also
illustrates the respective merits of the tools developed, respectively,
for control-oriented model validation and for the validation of a particular
controller.
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