Authors:
Jorge M. Gonçalves,
Volume: 1, Page 1382 Paper number 1734
Abstract:
This paper considers quadratic surface Lyapunov functions in the study
of global stability analysis of on/off systems (OFS), including those
OFS with unstable nonlinearity sectors. In previous work, quadratic
surface Lyapunov functions were successfully applied to prove global
asymptotic stability of limit cycles of relay feedback systems. In
this work, we show that these ideas can be used to prove global asymptotic
stability of equilibrium points of piecewise linear systems (PLS).
We present conditions in the form of LMIs that, when satisfied, guarantee
global asymptotic stability of an equilibrium point. A large number
of examples was successfully proven globally stable. These include
systems with an unstable affine linear subsystem, systems of relative
degree larger than one and of high dimension, and systems with unstable
nonlinearity sectors, for which all classical fail to analyze. In
fact, existence of an example with a globally stable equilibrium point
that could not be successfully analyzed with this new methodology is
still an open problem. This work opens the door to the possibility
that more general PLS can be systematically globally analyzed using
quadratic surface Lyapunov functions.
Authors:
Giovannina Albano,
Ciro D'Apice,
Benedetto Piccoli,
Volume: 1, Page 1388 Paper number 1665
Abstract:
Recently, significant interest has been raised in the study of hybrid
systems. In this paper we analyze the performance of various stabilizers,
including discontinuous and hybrid controls, to stabilize two model
problems, namely a linerized pendulum with observed position and the
Brockett system. In relation to this study we faced the presence of
periodic orbits in hybrid stabilizers that are responsible for low
performance of these.
Authors:
Bo Hu,
Guisheng Zhai,
Anthony N. Michel,
Volume: 1, Page 1391 Paper number 1378
Abstract:
In the present paper we utilize Lyapunov-like functions in the qualitative
analysis of switched systems. Specifically, for a class of second-order
switched systems consisting of two unstable subsystems, we explore
in detail some necessary and sufficient conditions for the existence
of common quadratic Lyapunov-like functions. We find that the existence
of quadratic Lyapunov-like functions is closely related to the recent
work on conic switching laws.
Authors:
Marcus Rubensson,
Bengt Lennartson,
Volume: 1, Page 1397 Paper number 2104
Abstract:
This paper concerns stability analysis of limit cycles in hybrid systems.
Continuous-time hybrid systems are modeled in a discrete-time affine
framework. The discrete-time approach is shown to be appropriate in
order to find a Lyapunov formulation for the stability of a hybrid
limit cycle. Multiple Lyapunov functions are associated with the transitions
in the hybrid system so that the trajectory is shown to converge to
the switch points of the limit cycle. The results are formulated in
Linear Matrix Inequalities (LMIs) which gives a constructive way to
find the Lyapunov functions using efficient algorithms. The results
are applied to a two-tank example with discrete valued actuators.
Authors:
Wassim M. Haddad,
VijaySekhar Chellaboina,
Sergey G. Nersesov,
Volume: 1, Page 1403 Paper number 126
Abstract:
In this paper we derive guaranteed hybrid gain, sector, and disk margins
for nonlinear optimal and inverse optimal hybrid regulators that minimize
a nonlinear-nonquadratic hybrid performance functional. Furthermore,
we develop a hybrid return difference inequality to provide connections
between dissipativity and optimality of nonlinear hybrid controllers.
Specifically, we show that optimal hybrid controllers imply dissipativity
with respect to a quadratic supply rate.
Authors:
Jun-ichi Imura,
Volume: 1, Page 1409 Paper number 1144
Abstract:
This paper presents a classification of bimodal piecewise affine systems
from the viewpoint of well-posedness. First, we address the problem
of feedback equivalence to a well-posed system, called here the feedback
well-posedness problem, of a general class of bimodal piecewise affine
systems. Next, based on this result, we classify all feedback well-posed
systems into four classes and derive a canonical form of the system
in each class, which allows us to address the control problem of piecewise
affine systems in a systematic way. Finally, as its application, the
stabilizability with well-posedness is discussed in each class, and
several remarks on stabilizability are given.
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