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The problem of control of orbit for the dynamic system x + x ( 1 -x ) ( x -a ) = 0 is discussed. Any unbounded orbit of the dynamic system can be controlIed to become a bounded periodic orbit by adding a periodic step excitation to the system. By using a nonlinear feedback control law presented in this paper the chaos of the dynamic system with excitation and damping is stabilized. This method is more effectual than the linear feedback control.

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