Authors:
Anton S. Shiriaev,
Anna Friesel,
John Perram,
Alexander Yu. Pogromsky,
Volume: 1, Page 5047 Paper number 1712
Abstract:
This paper addresses the problem of stabilization a rotational mode
of an inverted pendulum with a prescribed position of the cart. The
solution is based on the idea that a desired motion of the inverted
pendulum corresponds to some set (Gamma) in the phase space of the
system. In fact, the set (Gamma) describes periodic orbit for the closed
loop system and for the unforced inverted pendulum this set is not
invariant. We constructed a family of no-negative functions V_µ,
which are zero on (Gamma) and positive elsewhere, and suggested a globally
defined state feedback transformation, which makes the inverted pendulum
to be passive with V_µ from new input to the output -- a speed
of the cart. Taking advantage of passivity, we derived stabilizing
controller and obtained the qualitative description of behavior of
the closed loop system solutions. Moreover, the proposed control scheme
is extended for the case, when the inverted pendulum is controlled
by an actuator.
Authors:
Jian Han,
Ali Saberi,
Anton A. Stoorvogel,
Peddapullaiah Sannuti,
Volume: 1, Page 5053 Paper number 1727
Abstract:
Output regulation of linear systems with state and/or input magnitude
constraints is considered. The structural properties of linear plants
are identified under which the so called constrained semi-global and
global output regulation problems are solvable. An important aspect
of our development is a categorization of constraints to show clearly
for what type of constraints what can or cannot be achieved.
Authors:
Laura Menini,
Antonio Tornambè,
Volume: 1, Page 5059 Paper number 1139
Abstract:
An infinitely rigid, fully-actuated mass is considered, which moves
on a plane within a closed region delimited by an infinitely massive
and rigid circular barrier. The tracking problem of a class of periodic
trajectories involving an infinite number of impacts is considered.
Since the jumps in the velocities at the impact times render difficult
(if not impossible) to obtain the classical stability and attractivity
properties for the tracking error, such properties are properly amended
for the case of interest. A simple PD-like control law is proposed,
giving rise to control forces that are piece-wise continuous functions
of time.
Authors:
Franco Blanchini,
Stefano Miani,
Volume: 1, Page 5065 Paper number 2
Abstract:
We face the problem of determining a tracking domain of attraction,
say the set of initial states starting from which it is possible to
track reference signals in given class, for discrete-time systems with
control and state constraints. We show that the tracking domain of
attraction is exactly equal to the domain of attraction, say the set
of states which can be brought to the origin by a proper feedback law.
For constant reference signals we establish a connection between the
convergence speed of the stabilization problem and tracking convergence
which turns out to be independent of the reference signal. We also
show that the tracking controller can be inferred from the stabilizing
(possibly nonlinear) controller associated with the domain of attraction.
We refer the reader to the SIAM version, where the continuous-time
case, proofs and extensions are presented.
Authors:
Akihiro Ogata,
Masatoshi Yamamoto,
Kang-Zhi Liu,
Osami Saito,
Volume: 1, Page 5071 Paper number 9112
Abstract:
In this paper we consider the problem of constructing parameter dependent
Lyapnov functions that guarantee the stability of the linear systems
with an uncertain constant real parameter. First we formulate the surface
on which all parameter dependent Lyapunov matrices for a given uncertain
system exist. Next, after defining a Riemannian metric on the surface,
we derive a method to obtain a parameter dependent Lyapunov matrix
as a geodesic on the surface.
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