Vehicle noise caused by the brake squeal is a research topic that has been studied for more than 50 years. Although there has been no uniformly accepted theory to characterize the problem, results from past studies suggest that several factors contribute to this, such as negative slope in friction-velocity curve, modal coupling of the structure, instability induced by the geometry of the mechanism and stick-slip phenomenon. In this paper, the relative importance of the first two factors are studied using simple one and two degree of freedom systems. Conclusions drawn from the simplified analyses are discussed with their possible extensions to study realistic brake systems.
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