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Brake squeal is a phenomenon of self-induced vibration of the brake components during braking. There are many kinds of brake squeal cases whose mechanisms require acting on a various number of potential root causes. Brake squeal phenomena can be generally separated into 2 main mode types related to the direction of disc vibration involved: in-plane mode and out-of-plane mode. For out-of-plane mode, a number of existing countermeasures can be potentially applied after characterization of the squeal occurrence condition by direct experiment or simulation analysis[1,2,3,4]. However, as there are many possible mechanisms and root causes for the in-plane modes[5,6,7,8,9,10,11,12,13], it is generally necessary to perform a detailed analysis of the vibration mechanism before implementing a countermeasure.

The finite element method (FEM) is effective for analyzing brake squeal phenomena. Although FEM analysis can be used to easily obtain squeal frequencies and complex vibration modes, it is difficult to identify how to modify brake structure design or contact conditions between components. Therefore, this study deals with a practical design method using sensitivity analysis to reduce brake squeal, which is capable of optimizing both the structure of components and contact conditions. A series of analysis processes that consist of modal reduction, complex eigenvalue analysis, sensitivity analysis and optimization analysis is shown and some application results are described using disk brake systems.

The FE analysis is one of approach to develop the reduction method for brake squeal. This study shows the results of applying the FE analysis method, developed for disc brake with opposed piston type caliper shown in reference [1] and [2], to the analysis of low frequency disc brake squeal of floating type caliper. The FE analysis results are confirmed with the vibration mode during squeal generation measured by experiment. And some effective factors to the brake squeal are clear on floating type caliper by FE analysis.

The FEM analysis is one of approach to develop the reduction method for squeal. This study shows the effectiveness of the FE model by measuring vibration mode during squeal generation. And some effective factors to the squeal ( l-5kHz ) could be clear on opposed piston type caliper by FEM analysis.