How do grooves on friction interface affect tribological and vibration and squeal noise performance

Experimental studies on the effect of grooved disc on tribological properties, and vibration and noise properties are performed in two different contact configurations: ball-on-disc and pad-on-disc configurations. Experimental results show that certain sizes of grooves on the disc surface are capable of significantly affecting tribological behaviour and reducing squeal noise. Moreover, the grooves are found to play different roles in reducing squeal noise in these two different contact configurations. A disc sample with just one groove on the disc surface sufficiently validates the different abilities of grooves in suppressing squeal noise in both contact configurations. In addition, numerical analysis is performed to further demonstrate the effect of grooves in affecting squeal instability in both contact configurations.