Extension of a modal instability theory to real brake systems

Brake squeal emission is still one of the major problems in brake design, because there is not yet a clear understanding of the phenomenon. A crucial problem in studying squeal is the complexity of brake systems. For this reason many researchers in this field prefer to develop simplified, easy to model, experimental setups. In the past years, some researches were addressed to modeling such simplified brake systems that brought to the "lock-in" theory, able to explain the squeal occurrence on the developed experimental set-ups. This paper presents a parallel experimental and numerical analysis, aimed to extend the "lock-in" theory from simplified set-ups to real brake systems. The analysis of the dynamic behavior of the set-up is described and tied to the squeal occurrence.