250km/h动车组用闸片制动摩擦及噪声特性
Tribological and noise characteristics of brake pads used in high-speed train with a speed grade of 250 km/h
龙波 1陈刚 2余程巍 1程景琳 1王林波 1张鹏 2章林 2秦明礼 2曲选辉2
作者信息
- 1. 北京天宜上佳高新材料股份有限公司,北京 102402
- 2. 北京科技大学新材料技术研究院,北京 100083;北京科技大学北京材料基因工程高精尖创新中心,北京 100083
- 折叠
摘要
利用1∶1台架试验探究了250 km/h城际动车组闸片-盘紧急制动过程中的摩擦及噪声特性.结果表明当速度为50～250 km/h时,摩擦系数受制动速度增长影响较小,而制动压力的增加仅在250 km/h时诱导摩擦系数下降,表明该型闸片具有优异的摩擦系数稳定性.对于噪声特征,5000 Hz以下的噪声占主导地位,而更高频噪声只出现在某些特定的频率段.制动速度的增加会增加制动初期的噪声强度和频率范围,而压力提高则带来相反的抑制作用.高制动压力会促使制动后期高频啸叫的产生.因此,在制动时采用先高压力后低压力的变压力制动方式可能是降低高频制动噪声的方法.
Abstract
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.
关键词
动车组闸片/制动条件/摩擦/噪声Key words
brake pads/braking conditions/friction/noise引用本文复制引用
基金项目
国家自然科学基金资助项目(52204369)
出版年
2024
NETL
NSTL
万方数据