High Frequency Brake Squeal Prediction Index for Disc In-plane Mode 2009-01-2102
As well as performance and safety, sensibility factor such as brake squeal noise has become an important factor to consider in today’s automotive industry. However, regardless of its importance, reduction of brake squeal noise has remained as one of the biggest challenges that have not yet been solved. Recently, many studies are being conducted to reduce squeal noise with the development of numerical analysis using FEM(Finite Element Method). This paper deals with complex eigenvalue analysis with commercial software program ABAQUS to resolve the squeal noise related to disc in-plane mode which is reported to occur frequently in the squeal noise frequency band 1~20kHz. As the reliability of the FE model is the most critical factor in numerical analysis, the FE model is first correlated with FRF modal test of each brake part and measurement of material property of pad with the anisotropic character through ultrasonic methods. To reduce squeal noise related to disc in-plane mode, complex eigenvalue analysis was conducted for several vehicles and the applied results were classified to find out the overall tendency. Additionally, squeal prediction index was made based on the analysis result that has a coupling relationship between disc IPC(In-Plane Circumferential) mode and IP(In-Plane) modes of the pad and the disc in the vicinity of the frequency to avoid squeal noise in the early design stage.