Geodesic
On periodic motions of a rigid body suspended on a thread in a uniform gravity field
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, Tome 29 (2019) no. 2, pp. 245-260 Cet article a éte moissonné depuis la source Math-Net.Ru

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The planar motion of a rigid body in a uniform gravity field is considered. The body is suspended on a weightless inextensible thread. The thread is assumed to remain taut during the motion of the body. Nonlinear periodic oscillations of the body in the vicinity of its stable equilibrium position on the vertical are studied. These motions are generated by small (linear) normal body vibrations. The question of the existence of such motions is solved with the Lyapunov theorem on a holomorphic integral. An algorithm for constructing these motions using the canonical transformation method is proposed. The corresponding solutions are represented in the form of series in a small parameter characterizing the amplitude of the generating normal oscillations. A rigorous solution is given to the nonlinear problem of orbital stability of the motions obtained. Possible regions of parametric resonance (instability regions) are indicated. The third and fourth order resonance cases, as well as a nonresonant case, are considered. The study is based on the Lyapunov and Poincaré methods and KAM-theory.
Keywords: periodic motions, Hamiltonian system, resonance, stability. 
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A. P. Markeev. On periodic motions of a rigid body suspended on a thread in a uniform gravity field. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, Tome 29 (2019) no. 2, pp. 245-260. http://geodesic.mathdoc.fr/item/VUU_2019_29_2_a7/

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