The Effects of Friction Block Shape on Friction-Induced Wear, Vibration, and Noise of Train Brake Interface at Low Temperature

IF 2.9 3区 工程技术 Q2 ENGINEERING, CHEMICAL
Zhou Yu, Shuangxi Feng, Qixiang Zhang, Bin Tang, Jiliang Mo, Song Zhu, Wenwei Jin
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引用次数: 0

Abstract

On specific railway lines, trains are faced with the challenge of low-temperature environments. However, it is still unclear how the low-temperature service environment affects the friction-induced wear and vibration behavior at the train braking interface. Similarly, the impact of the brake pad friction block shape under low temperatures on this behavior is not well understood. This lack of knowledge adversely affects the operation, maintenance, and use of brake pads in low-temperature environments. Therefore, test samples of friction blocks were designed and processed based on several commonly used friction block shapes for trains (ellipse, triangle, and pentagon). Parking brake tests were conducted on a self-developed test bench with controllable temperature, exploring how different shapes affect friction-induced wear, vibration, and noise at the train braking interface under low temperatures (− 20 °C). The results showed that under the effects of low-temperature environments, the shape of the friction block significantly affects the friction-induced wear and vibration noise of the braking interface. Among them, the elliptical friction block has a smaller eccentric wear angle, a smaller and evenly distributed contact plateau area, relatively minor surface wear, and produces low-intensity vibration noise with small fluctuations. In contrast, the triangular and pentagonal friction blocks have larger eccentric wear angles, larger and concentrated contact plateau areas, relatively severe surface wear, and generate high-intensity vibration noise with large fluctuations. Analyzing the reasons, it is found that under the combined effects of low-temperature conditions and different shapes, the friction-induced wear on the surface of the friction block changes, thus exciting different intensities of vibration and noise.

Graphical abstract

Abstract Image

摩擦块形状对低温下列车制动器界面摩擦引起的磨损、振动和噪音的影响
在特定的铁路线上,列车面临着低温环境的挑战。然而,低温服务环境如何影响列车制动界面的摩擦引起的磨损和振动行为,目前仍不清楚。同样,制动片摩擦块形状在低温条件下对这种行为的影响也不甚了解。这种知识的缺乏对低温环境下制动片的操作、维护和使用产生了不利影响。因此,我们根据列车常用的几种摩擦片形状(椭圆形、三角形和五边形)设计并加工了摩擦片测试样本。在自主研发的可控温度试验台上进行了驻车制动试验,探索不同形状的摩擦块在低温(- 20 °C)条件下如何影响列车制动界面的摩擦引起的磨损、振动和噪音。结果表明,在低温环境影响下,摩擦块的形状对制动界面的摩擦引起的磨损和振动噪声有显著影响。其中,椭圆形摩擦块的偏心磨损角较小,接触平台面积较小且分布均匀,表面磨损相对较小,产生的振动噪声强度低且波动小。相比之下,三角形和五边形摩擦块的偏心磨损角较大,接触平台面积较大且集中,表面磨损相对严重,产生的振动噪声强度高且波动大。分析其原因可以发现,在低温条件和不同形状的摩擦块的共同作用下,摩擦块表面的摩擦引起的磨损发生了变化,从而激发了不同强度的振动和噪声。
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来源期刊
Tribology Letters
Tribology Letters 工程技术-工程:化工
CiteScore
5.30
自引率
9.40%
发文量
116
审稿时长
2.5 months
期刊介绍: Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.
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