Tribological and noise characteristics of brake pads used in high-speed train with a speed grade of 250 km/h
This work explores the tribological and noise characteristics of the brake pad-disc braking process of the intercity EMU at a speed grade of 250 km/h on a full-scale dynamometer.The results show that within the range of 50～250 km/h,the friction coefficient is less affected by the increase of braking speed.However,the braking pressure only promotes a decrease in the friction coefficient at a speed of 250 km/h,indicating that this type of brake pad has excellent friction coefficient stability.In terms of noise,noise with frequencies below 5000 Hz dominates,while higher frequency noise only oc-curs in certain specific frequency bands.The increase in braking speed increases the noise intensity and frequency range in the early stages of braking,while the increase in pressure has the opposite inhibitory effect.High braking pressure will promote the generation of high-frequency squeal in the later stages of braking.Therefore,using a variable pressure braking method with high pressure followed by low pres-sure during braking may be a method to reduce high-frequency braking noise.
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