Abstract
The solution to certain second order hyperbolic differential equations with weak non-linearities is found by using the Krylov Bogoliubov-Mitropolskii method. Both autonomous and non-autonomous equations are considered, and in the latter case, both the non-resonant and resonant problems are solved. The general methods are applied to the case of the longitudinal vibrations of a rod in which non-linear elastic behavior, nonlinear viscoelastic behavior, and viscous damping occur.
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