An example exempted from Thomson-Tait-Chetayev's theorem

Abuduwaili Paerhati, Yasuhide Fukumoto

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3 Citations (Scopus)


An example is given of a mechanical system whose behavior does not follow Thomson-Tait-Chetayev's (TTC) theorem which states that, for a system with an unstable potential, a state stabilized by gyroscopic forces goes unstable after the addition of arbitrary dissipation. The example is brought by a system, closely related with a heavy symmetrical top, describing motion of a charged spherical pendulum subjected to the Lorentz force, in a magneticmonopole field sitting at the sphere center, as well as the gravity force. A drag force proportional to the velocity is exerted on the pendulum. The upright state, an equilibrium stabilized by the Lorentz force, is shown to be exempted from the TTC theorem. The numerical calculation of the full nonlinear system is performed for precession. For the slow precession, the drag force acts to continuously tilt down the top axis toward vertically downward equilibrium, following the dissipation-induced instability. On the contrary, for the fast precession, the drag acts to continuously tilt up the axis against the gravity force, despite losing the energy.

Original languageEnglish
Article number043002
Journaljournal of the physical society of japan
Issue number4
Publication statusPublished - Apr 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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