Low frequent system excitation (Creep Groan) is a complaint from customers for a long time. Former research shows that this issue is system-related, and it is also considered that the friction characteristic of the friction couple under the condition of low pressure and low speed is the cause of the low-frequency vibration. A methodology is developing to study and qualifying the friction behaviour under the condition of extremely low speed by use of scale dynamometer. This paper measures the static and dynamic torque and analysis of its continuously conversion process which could be called stick-slip phenomenon the cause of low frequency excitation (Creep Groan) in the aspect of friction materials. As the first step, this paper introduces the consideration of the methodology development and the analysis of the test data. Also, the methodology repeatability and correlation between a vehicle were studied as well. Finally the paper uses the methodology quickly to filter the stick-slip properties under different climate of raw materials which will be used in friction pads and try to improve its creep groan performance in vehicle.

Mrs. Aihong Li, R&D Manager, Zhuhai Glory Friction Material Co.,Ltd; Mr. Victor Li, Technical Consultant, Zhuhai Glory Friction Material Co.,Ltd