The effect of dynamic normal force on the stick–slip vibration characteristics

In the experiment, we observed such a phenomenon: alternating normal force changes vibration state of friction system. A single-degree-of-freedom mathematical model was used in this paper to discuss effects constant and on stick–slip characteristics for different dynamic static coefficients. Under condition that applied continues increase, amplitude system, limit cycle, adhesion time system increase. When difference between coefficients (DSFCs) is small, has complete clear cycle. coefficient reduced, DSFCs increases, cycle deformed. The more abundant under an than force. presents single-cycle when excites multi-order harmonic response excitation frequency same as main with highest energy or low-order even-order frequency. contrast, exhibits various modes dissimilar system's consistent odd-order addition, increasing using very high frequencies amplitudes increases likelihood entering chaotic state.