A study on squeal noise reduction considering the pad shape of the disc brake system for urban railway vehicles

In this paper, to help reduce the squeal noise produced during the braking of urban railway vehicles, the shape of the disc brake pad was investigated to relieve contact stress. To analyze the disc brake system to identify the source of the squeal noise, a finite element model of the disc brake system was used, including the peripheral brake parts to increase accuracy. A complex eigenvalue analysis was performed to predict squeal noise generation. Verification was carried out using domestic urban railway field test results to confirm the accuracy of the analysis model. A pad shape that relieves contact stress is proposed to reduce squeal noise produced by nonuniform contact between the disc and pad. The results of this study can be utilized for future studies on squeal noise reduction.