The goal of this paper is to study stabilization techniques for a system described by nonlinear second-order differential equations. The problem is to determine the feedback control as a function of the state variables. It is shown that the following controllers can asymptotically stabilize the system: linear position feedback, linear velocity feedback and a group of nonlinear feedbacks. The asymptotic stability of the closed-loop system has been proved by LaSalle's invariance principle. The results of numerical computations are included to verify theoretical analysis and mathematical formulation.
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