Nonlinear Sciences – Chaotic Dynamics
Scientific paper
1993-10-27
Nonlinear Sciences
Chaotic Dynamics
26 Pages, LaTeX document with AMSTeX `mssymb' font, figures available from the author (h.lamba@bristol.ac.uk) on request
Scientific paper
A discontinuous area-preserving mapping derived from a sinusoidally-forced impacting system is studied. This system, the elastic impact oscillator, is very closely related to the accelerator models of particle physics such as the Fermi map. The discontinuity in the mapping is due to grazing which can have a surprisingly large effect upon the phase space. In particular, at the boundary of the stochastic sea, the discontinuity set and its images can act as a partial barrier which allows trajectories to move between chaotic and regular regions. The system at higher energies is also analysed and Moser's invariant curve theorem is used to find sufficient conditions for the existence of invariant curves that bound the energy of the motion. Finally the behaviour of the system under more general periodic forcing is briefly investigated.
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