This article presents an experiment and numerical simulation on friction noise. The noise emitted by a solid rubbing on a rough surface, also called roughness noise, results from a complex interac-tion between microscopic asperities of both surfaces. It is characterized by a wide band spectrum, a low noise levels and a weak mechanical interaction. The level is controlled by several external parameters such as surface roughness, normal load and sliding speed. The purpose of our study is to understand the evolution of roughness noise versus sliding speed. To achieve this goal, an ex-perimental approach and numerical simulation have been used and the obtained results highlight the law between sound level and sliding velocity. The main conclusion of the study is that noise level versus sliding speed follows a power law with an exponent about 3/4. Keywords: roughness noise, sliding speed, vibratory level
