The Influence of Surface Roughness on Friction-Induced Squeal

Experimental study of the friction noise properties of smooth and sandblasting surfaces was performed by using two experimental setups with different structural stiffness, to investigate the influence of surface roughness on friction squeal. The test results show that the surface roughness and wear status of surface asperities played a key role in the triggering and evolution of squeal and the sandblasting surface with a higher surface roughness could significantly suppress the generation of squeal. In this work, adhesion and tearing from the debris accumulation, adhesive wear and detachment between the friction surfaces were more likely to cause the high frequency components of the interface friction force and consequently a higher squeal propensity. The rough surface generated by sandblasting significantly reduced the formation of these interface factors, which reduced the high-frequency components efficiently and finally restrained the generation of friction squeal.