4,061 research outputs found
Shilnikov problem in Filippov dynamical systems
In this paper we introduce the concept of sliding Shilnikov orbits for D
Filippov systems. In short, such an orbit is a piecewise smooth closed curve,
composed by Filippov trajectories, which slides on the switching surface and
connects a Filippov equilibrium to itself, namely a pseudo saddle-focus. A
version of the Shilnikov's Theorem is provided for such systems. Particularly,
we show that sliding Shilnikov orbits occur in generic one-parameter families
of Filippov systems, and that arbitrarily close to a sliding Shilnikov orbit
there exist countably infinitely many sliding periodic orbits. Here, no
additional Shilnikov-like assumption is needed in order to get this last
result. In addition, we show the existence of sliding Shilnikov orbits in
discontinuous piecewise linear differential systems. As far as we know, the
examples of Fillippov systems provided in this paper are the first exhibiting
such a sliding phenomenon
On the periodic solutions of a generalized smooth or non-smooth perturbed planar double pendulum
We provide sufficient conditions for the existence of periodic solutions with
small amplitude of the non--linear planar double pendulum perturbed by smooth
or non--smooth functions.Comment: arXiv admin note: substantial text overlap with arXiv:1109.637
Generic bifurcation of reversible vector fields on a 2-dimensional manifold
In this paper we deal with reversible vector fields on a 2-dimensional manifold having a codimension one submanifold as its symmetry axis. We classify generically the one parameter families of such vector fields. As a matter of fact, aspects of structural stability and codimension one bifurcation are analysed
Foliations, solvability and global injectivity
Let F: R^n -> R^n be a C^\infty map such that DF(x) is invertible for all x
in R^n. We know that F is a local diffeomorphism but, in general, it is not
globally injective. We discuss the relations between some additional hypothesis
that guarantee the global injectivity of F. Further, based on one of these
hypotheses, we establish a necessary condition for the existence of F: R^n ->
R^n such that det DF = h, where h: R^n -> [0,\infty) is a given C^\infty
function
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