In this effort, a new control method to keep the state of the arbitrary impact between the tip of the excited cantilever and the object surface is proposed. It is known that various bifurcations of the responses of the beam occur according to impact conditions and variation of the excitation frequency. We propose a control method to keep the magnitude of a specific frequency component constant and the state of particular impact independent of changes in the distance between the cantilever and the contact surface. For this purpose, a real-time signal processing method is suggested to determine the magnitude of the frequency component at half the excitation frequency. A servo system is designed to control the center of the excitation precisely for the above purpose. Finally, validity of the proposed control method is confirmed by experiments.

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