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Etude analytique du voisinage de la resonance 4:4:1 dans les systemes a trois degres de liberte

The resonance 4:4:1 for Hamiltonian systems with three degrees of freedom

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On étudie les solutions périodiques d'un système ayant pour Hamiltonien

$$H = \frac{1}{2}\mathop \Sigma \limits_1^3 (\dot x_\alpha ^2 + \omega _\alpha ^2 x_\alpha ^2 ) - \varepsilon x_1 x_\alpha ^2 - \eta x_2 x_\alpha ^2 $$

. Les fréquences ωα, (α=1, 2, 3) sont proches du rapport 4∶4∶1.

On trouve différentes familles de solutions périodiques dont la période T est voisine de la période T′=2π/ω3=2π/ω′.

Comme dans le problème à deux degrés de liberté, les familles de solutions proches de l'axe x3 sont discontinues pour certaines valeurs des paramètres, ω1, ω2, ω3, ε, η. On détermine les conditions initiales conduisant aux solutions périodiques dans une région ε, η=[0; 0.4] avec\(\omega ' = \sqrt {0.1} \) et h=0.00765.

Abstract

The periodic solutions for an Hamiltonian system with

$$H = \frac{1}{2}\mathop \Sigma \limits_1^3 (\dot x_\alpha ^2 + \omega _\alpha ^2 x_\alpha ^2 ) - \varepsilon x_1 x_\alpha ^2 - \eta x_2 x_\alpha ^2 $$

are investigated analytically. The frequencies ωα, α=1, 2, 3 are assumed near the ratio 4—4—1.

We find different families of periodic solutions whose periods are in the vicinity of the period T′=2π/ω3=2π/ω′.

As in the case of the problem with two degrees of liberty, for particular values of ω1, ω2, ω3 and ε, η, we find that the families near the x3-axis are discontinuous. These families are periodic with periods near the period T′ in a region for ε, η, approximatively [0; 0.4] if we choose\(\omega ' = \sqrt {0.1} \) and h=0.00765.

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References

  • Contopoulos, G.: 1981,Celest. Mech.,24, 355.

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  • Magnenat, P.: 1982,Celest. Mech. 28, 319.

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  • Stellmacher, I.: 1984,Celest. Mech. (à paraître) (I et II).

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Stellmacher, I. Etude analytique du voisinage de la resonance 4:4:1 dans les systemes a trois degres de liberte. Celestial Mechanics 33, 343–365 (1984). https://doi.org/10.1007/BF01241049

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  • DOI: https://doi.org/10.1007/BF01241049

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