| FENG Shuangxi,YU Zhou,ZHANG Qixiang,TANG Bin,MO Jiliang,JIN Wenwei,ZHU Song.Effect of Environmental Temperature on Friction, Wear, Vibration and Noise at Braking Interface of Trains[J],54(7):68-78 |
| Effect of Environmental Temperature on Friction, Wear, Vibration and Noise at Braking Interface of Trains |
| Received:June 07, 2024 Revised:September 05, 2024 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2025.07.005 |
| KeyWord:environmental temperature braking system parking brake friction and wear friction-induced vibration and noise |
| Author | Institution |
| FENG Shuangxi |
School of Mechanical Engineering,Chengdu , China;State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu , China |
| YU Zhou |
School of Mechanical Engineering,Chengdu , China;State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu , China |
| ZHANG Qixiang |
School of Mechanical Engineering,Chengdu , China;State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu , China |
| TANG Bin |
School of Mechanical Engineering, Guiyang University, Guiyang , China |
| MO Jiliang |
School of Mechanical Engineering,Chengdu , China;State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu , China |
| JIN Wenwei |
CRRC Qishuyan Institute Co., Ltd., Jiangsu Changzhou , China |
| ZHU Song |
CRRC Qishuyan Institute Co., Ltd., Jiangsu Changzhou , China |
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| Abstract: |
| Railway lines spanning a wide range of geographical latitudes, especially those operating under extreme weather conditions, face severe challenges. When trains operate in such environments, they need to adapt to various complex terrains and climate conditions, while dealing with significant changes in the tribological behavior of the train braking interface caused by environmental temperature variations. The braking system of a train is a key component that ensures its safe operation, and its performance directly affects the braking effect and driving safety of the train. As the train runs across a wide range of geographical latitudes, different environmental temperature can lead to significant changes in the physical properties of brake discs and friction blocks, thus affecting the friction, wear, vibration and noise characteristics of the braking interface. To investigate the impact of environmental temperature on friction, wear, vibration and noise of the train braking interface, as well as its mechanism, a series of experiments were conducted on a train braking performance simulation test bed with controllable environmental temperature. With environmental temperature as a variable, braking tests were performed under 20 ℃, 0 ℃, −20 ℃, and −40 ℃. At each temperature, 50 repeated braking tests were carried out to ensure the accuracy and reliability of data. During the experiments, various signals, such as vibration acceleration, noise, temperature, braking force, and braking torque were collected and analyzed in detail. The surface morphology of the friction block and the debris particles falling out of the braking interface were observed by scanning electron microscopy (SEM) and optical microscopy (OM) to understand the microstructure and wear condition of the friction interface. Simultaneously, the friction blocks were weighed before and after the experiments to assess their wear rate. The experimental results showed that as the environmental temperature decreased, the RMS values of tangential vibration acceleration and noise sound pressure at the braking interface increased significantly. Under −40 ℃, the tangential vibration acceleration reached 937.0 m/s², and the noise sound pressure reached 34.0 Pa, significantly higher than the 578.6 m/s² and 24.4 Pa at 20 ℃. Additionally, the friction coefficient also showed a downward trend, decreasing from 0.50 at 20 ℃ to 0.44 at −40 ℃. Meanwhile, the wear rate also decreased significantly, from 111.0 μg/s at 20 ℃ to 54.8 μg/s at −40 ℃, almost half of the original value. These experimental results indicate that during the braking process, as the environmental temperature decreases, the brittleness of the brake disc and friction block materials increases, making them more prone to fragmentation and generating large debris particles under friction. These large debris particles affect the formation and distribution of the third body at the friction interface, affecting the distribution of contact plateaus on the friction block surface. This ultimately impacts the friction, wear, vibration, and noise characteristics of the braking interface, and the vibration of the interface further affects the friction and wear characteristics, forming a cycle. Therefore, in practical applications, it is necessary to optimize the design and adjustment of the train braking system for different environmental temperature conditions to ensure that the train maintains good braking performance and driving safety under various climatic conditions. |
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