Cause analysis of Braking Noise of A Metro Project with Aluminum Disc

Abstract

Objective In a certain project, significant noise is generated during the last braking parking phase, affecting the surrounding residents rest and passenger comfort due to noise pollution caused by braking. Therefore, it is necessary to analyze the causes of the noise. Method A typical noisy train is selected, and vibration acceleration sensors are installed on the caliper hanger and brake pad support. Sound sensors are installed on the caliper for experimentation. The relationship between noise occurrence and caliper vibration frequency under different operating conditions for different bogies are analyzed. Result & Conclusion Through testing, it is found that during braking, the brake disc generates vibrations around 300 Hz, with vibration accompanying the entire noise process. The noise is caused by resonance between the brake disc and the caliper during braking. To mitigate the noise, it is recommended to use electric braking as much as possible during braking to reduce the use of pneumatic braking, thereby reducing braking noise. Additionally, modifying the brake pad chamfer or replacing the caliper fixing bolts to change the caliper vibration frequency can help to reduce resonance between the brake disc and the caliper during braking.

Keywords

• metro
• noise
• resonance
• brake disc