Influence of Brake pad shim on the Brake Noise for Sports Utility Vehicle (SUV) 7 Seats
Keywords:
Complex eigenvalue analysis (CEA), Finite Element, Brake pads shim, Brake high frequencyAbstract
The purpose of this research is studying influence of Brake pad shim to avoid brake high frequency noise in with range 4–16 kHz, is called “High Frequency Brake Squeal Noise” for Sports Utility Vehicle (SUV) 7 seats. The method of this studying including demonstrate on the vehicle testing and finite element analysis. The finite models existing such as Brake disc vane, Brake pads lining, Brake pads plate and Brake pad shims are established by SimXpert 2020 software. To understand brake squeal noise mechanism, the Complex Eigenvalue Analysis (CEA) technique is used for stability analysis of brake system that under influence of friction coefficient. The result showed, experimental testing on vehicle data and finite element analysis by CEA are corresponding, brake squeal noise is generated at frequency within range is 14.8–16.5 kHz on the friction coefficient 0.5 and pressure 5 MPa. To avoid brake squeal noise and unstable mode, there are various methods and approaches to correct such as brake component modification, structural damping increasing, material properties improvement etc. These methods could shift and improve resonance frequencies and mode vibrations for brake disc and brake pads where are the factors of unstable modes of brake squeal noise by friction coefficient. A simple of Brake pad shim metal is modified and studied on this research, the dimension of shape is 38.7 mm × 130.74 mm × 1 mm for the wide, length and thickness, respectively and the total area is equal 7,898.18 mm2. The surface of shim is drilled to be curve slot and one circle on the middle of component and assumed the material properties is stainless steel. Then, Brake pad shims are bonded on the brake pads to increase structural damping and simulated on the similar condition by CEA, the result showed this modification could avoid high frequency brake squeal noise is efficiency.
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