Experimental and numerical studies of friction-induced vibration and noise and the effects of groove-textured surfaces

• The effect of groove on squeal is studied by both experimental and numerical methods.
• Dynamic transient analysis simulates impact behavior between ball and groove edges.
• Use both numerical simulation and wear observation to state the role of the impacts.
• A 3-DOF model was proposed to further study the influence of groove on squeal.

An experimental and numerical study of friction-induced vibration and noise of a system composed of an elastic ball sliding over a groove-textured surface was performed. The experimental results showed that the impact between the ball and the edges of the grooves may significantly suppress the generation of high frequency components of acceleration and reduce the friction noise. Groove-textured surfaces with a specific dimensional parameter showed a good potential in reducing squeal. To model and understand this noise phenomenon, both the complex eigenvalue and dynamic transient analysis were performed. The dynamic transient analysis for the cases of groove-textured surface with/without filleted edges validated the role of the impact between the ball and the groove edges. Furthermore, a self-excited vibration model with three degrees of freedom was proposed to capture the basic features of the friction system. A small contact angle between the ball and the groove edges, corresponding to the relatively small groove width used in this study, would not cause any instability of the system.