Vibration characteristics of sticking motions of the vibro-impact system under the coupling function of the dry friction and clearance are investigated by Runger-Kutta numerical method. The symmetric, asymmetric period motions, chattering motions and chaos are found in the vibro-impact system. For small friction, the sliding-impact motions without sticking are dominating, for large friction, the pitchfork bifurcation point of the system shifts to the direction of low frequency, the region of the chaos becomes narrower than the small friction. With the frequency decreasing, the sliding-impact motions evolve into sticking-sliding-impact motions, at a very small frequency, chattering occurs.
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