A compound pendulum with deterministically periodic perturbation is treated
. In the analytical approximation, chaotic solution initially near the homo
clinic one is constructed and its boundedness conditions are established. I
t is shown that the chaotic solution is analytically bounded and numericall
y unbounded, which describes a non-periodical vibration around unstable equ
ilibrium of the corresponding unperturbed system (C)2000 Published by Elsev
ier Science B.V.