| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 620179 | Wear | 2006 | 5 Pages |
Noise and squeal from brakes is a problem in the automotive industry and large efforts are made to reduce the squeal tendencies. The approach taken is mainly to improve the design of the caliper, to fine-tune the brake pad material and finally to trim by introducing shims on the backside of the pads. Despite these efforts still no general solutions exist. To advance the situation, a deeper understanding of the actual source of excitation of the sound in the friction interface is needed.Earlier investigations by the present authors have made it clear that grit blasting of a disc lowers the coefficient of friction between disc and pad and may have a strong influence on the squeal propensity. Depending on the pattern of the grit blasted area the noise can be either promoted or reduced.In the present investigation, a spiral shaped modification of the brake disc surface topography has been tested with respect to the noise reduction properties. All tests have been made in a brake test equipment consisting of a complete front wheel corner of a car.The treatment has resulted in a significant reduction of the generation of noise. Unfortunately, due to wear the silencing effect has a limited life-time, here around 3000 long brakings.
