Geodesic
To dynamics of a double pendulum with a horizontally vibrating point of suspension
Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2012), pp. 114-129 Cet article a éte moissonné depuis la source Math-Net.Ru

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We consider the motion of a system consisting of two hinged thin uniform rods rotating about horizontal axes. It is assumed that the point of suspension of the system coinciding with the point of suspension of one of the rods makes horizontal high-frequency harmonic oscillations of a small amplitude. Investigation of stability of four relative equilibria in the vertical is carried out. It is proved that only the lower (“hanging”) relative equilibrium can be stable if the oscillation frequency of the point of suspension doesn't exceed the fixed value. For a system consisting of two identical rods the nonlinear problem of stability of this equilibrium is solved. The problem of existence, bifurcations and stability of high-frequency periodic motions of a small amplitude which differ from the relative equilibria in the vertical is also studied for the system.
Keywords: double pendulum, high–frequency oscillations, stability, KAM-theory. 
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E. A. Vishenkova; O. V. Kholostova. To dynamics of a double pendulum with a horizontally vibrating point of suspension. Vestnik Udmurtskogo universiteta. Matematika, mehanika, kompʹûternye nauki, no. 2 (2012), pp. 114-129. http://geodesic.mathdoc.fr/item/VUU_2012_2_a10/

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