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Keywords:
second-order nonlinear differential equation; stability; instability; Floquet multiplier; Lyapunov exponent; periodic solution
second-order nonlinear differential equation; stability; instability; Floquet multiplier; Lyapunov exponent; periodic solution
Summary:
We discuss Lyapunov stability/instability of both lower and upper equilibria of free damped pendulum with periodically oscillating suspension point. We recall the results of Bogolyubov and Kapitza, provide new effective criteria of stability/instability of the equilibria of pendulum equation, and give the exact and complete proofs. The criteria obtained are formulated in terms of positivity/negativity of Green's functions of the periodic boundary value problems for linearized equations. Furthermore, we show that if both lower and upper equilibria are stable, then the pendulum considered may possess a periodic motion that corresponds to the ``quasistatic solution'' of Bogolyubov as well as to the ``quasistatic balance'' of Kapitza.
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