Kam theory, Lindstedt series and the stability of the upside-down pendulum

Michele V. Bartuccelli; G. Gentile; Kyriakos V. Georgiou

doi:10.3934/dcds.2003.9.413

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2003, Volume 9, Issue 2: 413-426. Doi: 10.3934/dcds.2003.9.413

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Kam theory, Lindstedt series and the stability of the upside-down pendulum

1.
Department of Mathematics and Statistics, University of Surrey, GU2 7XH
2.
Dipartimento di Matematica, Università di Roma Tre, Roma, I-00146

Received: September 30, 2001

Revised: February 28, 2002

Published: February 2003

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Abstract

We consider the planar pendulum with support point oscillating in the vertical direction; the upside-down position of the pendulum corresponds to an equilibrium point for the projection of the motion on the pendulum phase space. By using the Lindstedt series method recently developed in literature starting from the pioneering work by Eliasson, we show that such an equilibrium point is stable for a full measure subset of the stability region of the linearized system inside the two-dimensional space of parameters, by proving the persistence of invariant KAM tori for the two-dimensional Hamiltonian system describing the model.

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Mathematics Subject Classification: Primary 34D20, 34C29, 58F10, 58F27, 58F30, 34B30, 34C15.

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