Asymptotic stability of solutions to one class of nonlinear second-order differential equations with parameters

We consider a class of nonlinear second-order ordinary differential equations with parameters. Differential equations of such type arise when studying oscillations of an «inversed pendulum» in which the pivot point vibrates periodically. We establish conditions under which the zero solution is asymptotically stable. We obtain estimates for the attraction domain of the zero solution and establish estimates for the decay rate of solutions at infinity. Obtaining the results, we use a criterion for asymptotic stability of the zero solution to systems of linear ordinary differential equations with periodic coefficients. The criterion is formulated in terms of solvability of a special boundary value problem for the Lyapunov differential equation on the interval. The estimates of the attraction domain of the zero solution and estimates for the decay rate of the solutions at infinity are established by the use of the norm of the solution to the boundary value problem.