Kim Y., Lee G., Lee S.

Tire noise is one of the environment noise issues. Thus many noise source studies are done to reduce tire noise. One of the tire noise sources is stick/slip noise that is caused by friction between road surface and tire tread. Especially on driving condition external forces such as driving, braking force and side force are applied to tire. And these forces induce slip between road surface and tire tread. At that time, this slip ratio is set by the magnitude of external force and general slip ratio is 0 to 1 in normal driving condition. In this slip range stick/slip phenomenon is observed in contact patch and sometimes this stick/slip phenomenon generates noise. The previous study for stick/slip mechanism is reviewed. And we developed test machine to study stick/slip vibration of tread rubber block experimentally. Non contact laser vibro-meter is used to measure the block movement. In this way stick/slip phenomenon is observed experimentally and it is compared with analytical model. From experimental test it is found that sliding speed is one of the major factors to generate stick/slip noise. And stick/slip vibration has the time variant characteristic and occurs about 1.5~1.8Khz.