We study the dynamics of an elastic body whose shape and position evolve due to the gravitational forces exerted by a pointlike planet. The main result is that, if all the deformations of the satellite dissipate some energy, then under a suitable nondegeneracy condition there are only three possible outcomes for the dynamics: (i) the orbit of the satellite is unbounded, (ii) the satellite falls on the planet, (iii) the satellite is captured in synchronous resonance i.e. its orbit is asymptotic to a motion in which the barycenter moves on a circular orbit, and the satellite moves rigidly, always showing the same face to the planet. The result is obtained by making use of LaSalle’s invariance principle and by a careful kinematic analysis showing that energy stops dissipating only on synchronous orbits. We also use in quite an extensive way the fact that conservative elastodynamics is a Hamiltonian system invariant under the action of the rotation group.
|Titolo:||Asymptotic Behavior of an Elastic Satellite with Internal Friction|
BAMBUSI, DARIO PAOLO (Corresponding)
|Parole Chiave:||Dynamics of an elastic satellite; La Salle principle; Spin orbit resonance; Mathematical Physics; Geometry and Topology|
|Settore Scientifico Disciplinare:||Settore MAT/07 - Fisica Matematica|
|Data di pubblicazione:||2015|
|Digital Object Identifier (DOI):||10.1007/s11040-015-9184-7|
|Appare nelle tipologie:||01 - Articolo su periodico|