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On the global geometric structure of the dynamics of the elastic pendulum. (English) Zbl 0963.70013
The authors studies the dynamics of planar elastic pendulum by considering it as a singular perturbation of uncoupled pendulum. The equations of motion are $$\ddot\theta+ {2\dot\theta \dot R\over 1+R}+ {\sin\theta \over 1+R}=0$$ and $$\ddot R+({\omega_s \over\omega_p})^2 R-(1+R_)\dot \theta^2+1-\cos\theta=0$$, where $$\omega_p$$ and $$\omega_s$$ denote respectively natural frequencies of the pendulum and radial oscillator. The author determines the global geometric structure of the dynamics in terms of two-dimensional invariant manifolds of motion. A general analytic study is carried out and confirmed by numerical experiments.
Reviewer: S.Nocilla (Torino)

##### MSC:
 70K05 Phase plane analysis, limit cycles for nonlinear problems in mechanics 70K20 Stability for nonlinear problems in mechanics 70K50 Bifurcations and instability for nonlinear problems in mechanics 70K60 General perturbation schemes for nonlinear problems in mechanics
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