Design and analysis of disc brake for low brake squeal

Abstract

Vibration induced due to friction in disc brake is a theme of major interest and related to the automotive industry. Squeal noise generated during braking action is an indication of a complicated dynamic problem which automobile industries have faced for decades. For the current study, disc brake of 150 cc is considered. Vibration and sound level for different speed are measured. Finite element and experimentation for modal analysis of different element of disc brake and assembly are carried out. In order to check that precision of the finite element with those of experimentation, two stages are used both component level and assembly level. Mesh sensitivity of the disc brake component is considered. FE updating is utilized to reduce the relative errors between the two measurements by tuning the material. Different viscoelastic materials are selected and constrained layer damping is designed. Constrained layer damping applied on the back side of friction pads and compared vibration and sound level of disc brake assembly without constrained layer damping with disc brake assembly having constrained layer. It was observed that there were reduction in vibration and sound level. Nitrile rubber is most effective material for constrained layer damping.