Geodesic
On bifurcations and stability of resonance periodic motions of hamiltonian systems with one degree of freedom caused by degeneration of the hamiltonian
Russian journal of nonlinear dynamics, Tome 2 (2006) no. 1, pp. 89-110.

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Motions of a non-autonomous time-periodic Hamiltonian system with one degree of freedom are considered. The Hamiltonian of the system contains a small parameter. The origin of the phase space is a linearly stable equilibrium of the unperturbed or complete system. It is supposed that the degeneration takes place in the unperturbed system with regard for terms of order less than five (the frequency of small nonlinear oscillations does not depend on the amplitude), and a resonance (up to the sixth order inclusively) occurs. For each resonance case a model Hamiltonian is constructed, and a qualitative investigation of motion of the model system is carried out. Using Poincaré's theory of periodic motions and KAM-theory we solve rigorously the problem of existence, bifurcations and stability of periodic motions of the initial system. The motions we study are analytical with respect to fractional (for resonances up to the forth order inclusively) or integer (resonances of fifth and sixth orders) degrees of the small parameter. As an illustration, we analyze resonance periodic motions of a spherical pendulum and a Lagrange top with a vibrating point of suspension in the presence of the degeneration considered.
Keywords: Hamiltonian system, stability, resonance, Poincaré's theory of periodical motions, KAM-theory. 
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     author = {O. V. Kholostova},
     title = {On bifurcations and stability of resonance periodic motions of hamiltonian systems with one degree of freedom caused by degeneration of the hamiltonian},
     journal = {Russian journal of nonlinear dynamics},
     pages = {89--110},
     publisher = {mathdoc},
     volume = {2},
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     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ND_2006_2_1_a4/}
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O. V. Kholostova. On bifurcations and stability of resonance periodic motions of hamiltonian systems with one degree of freedom caused by degeneration of the hamiltonian. Russian journal of nonlinear dynamics, Tome 2 (2006) no. 1, pp. 89-110. http://geodesic.mathdoc.fr/item/ND_2006_2_1_a4/