| 引用本文: | 张棋翔,莫继良,项载毓,王权,冯双喜,翟财周,朱松.高速列车制动摩擦块表面微织构影响粘滑振动的有限元及试验研究[J].中国表面工程,2024,37(5):373~383 |
| ZHANG Qixiang,MO Jiliang,XIANG Zaiyu,WANG Quan,FENG Shuangxi,ZHAI Caizhou,ZHU Song.Finite Element Simulation and Test Verification of the Effect of Microgrooved Textures on the Stick-slip Vibration of Brake Friction Blocks in High-speed Trains[J].China Surface Engineering,2024,37(5):373~383 |
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| 摘要: |
| 高速列车在制动过程中出现的低频粘滑振动现象给制动系统的安全性和稳定性构成了极大的挑战，因此，降低或抑制制动过程中的粘滑振动对于提高列车安全运营具有重要意义。为此，通过在摩擦块表面设计了一系列不同数量的平行微织构， 并结合有限元仿真和试验分析，研究了其对粘滑振动的抑制效果。结果表明，表面微织构能改善盘 / 块界面接触状态，增加实际接触面积，使接触应力分布均匀，降低磨损并提高界面贴合稳定性。在所设计的微织构参数范围内，粘滑振动强度随表面微织构数量的增加而降低，其振动形式由不规则粘滑振动逐渐转为近简谐振动。因此，改善摩擦界面接触状态是降低粘滑振动强度的主要因素，良好的界面贴合度和轻微的磨损有助于实现粘滑振动的有效抑制。研究成果可为抑制高速列车制动系统粘滑振动的摩擦界面调控方案提供一定的理论依据和应用指导。 |
| 关键词: 高速列车 制动系统 表面微织构 粘滑振动 接触行为 |
| DOI：10.11933/j.issn.1007-9289.20231101001 |
| 分类号:TH117 |
| 基金项目:国家自然科学基金（U22A20181）；广西自然科学基金（2023GXNSFBA026326）；中车戚墅堰机车车辆工艺研究所有限研究所有限公司科技项目（Z2022-0004） |
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| Finite Element Simulation and Test Verification of the Effect of Microgrooved Textures on the Stick-slip Vibration of Brake Friction Blocks in High-speed Trains |
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ZHANG Qixiang1，MO Jiliang1，XIANG Zaiyu2，WANG Quan1，FENG Shuangxi1，ZHAI Caizhou3，ZHU Song3
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1.School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031 , China ；2.School of Mechanical Engineering, Guangxi University, Nanning 530004 , China ；3.CRRC Qishuyan Institute Co., Ltd., Changzhou 213011 , China
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| Abstract: |
| High-speed train braking systems experience stick-slip vibrations during low-speed braking, particularly before new brake pads reach a stable wear stage. Stick-slip vibrations lead to the abnormal wear and fracture of the friction blocks, threatening train braking safety. Moreover, they produce significant braking noise, which impacts passenger comfort and the everyday lives of residents along the route as well as leads to numerous complaints. Therefore, an in-depth study of the stick-slip vibration mechanism of high-speed train braking systems and the development of effective suppression strategies are crucial for enhancing train safety and passenger comfort. Stick-slip vibration, a typical friction-induced phenomenon, is significantly influenced by interface contact characteristics. Researchers have focused on studying interface contact characteristics and suggested that controlling these characteristics may suppress stick-slip vibrations. Considering the role of the surface texture in improving tribological performance, a series of parallel microgrooved textures of varying quantities are designed on the surfaces of the friction blocks. Finite element simulations and experimental analyses are combined to assess the effectiveness of microgrooved surface textures in suppressing stick-slip vibrations during high-speed train braking. Initially, finite element simulations reveal the effects of the number of surface microgrooved textures of the friction block on the contact stress, wear depth, interface contact degree, and vibration characteristics. These results indicate that the surface-microgrooved textures extended the primary load-bearing area in the direction of the texture, increase the contact area, and achieve a more uniform distribution of the contact stress. As the number of surface-microgrooved textures increases, the degree of interface contact gradually improves, and the amplitude of the displacement and velocity of the friction blocks decreases, transitioning from complex motion to more regular motion. However, finite element analysis alone struggles to account for the effects of wear debris generation and flow during friction, changes in wear surface morphology, and system vibrations, resulting in an incomplete reflection of the interface control function of the microgrooved surface textures. Therefore, friction tests must be conducted to verify the actual effects of surface-microgrooved textures in suppressing stick-slip vibrations. The experimental results indicate that surface-microgrooved textures effectively suppress high-frequency irregular vibrations and reduce the intensity of stick-slip vibrations. An analysis of the contact behavior reveals that microgrooved surface textures increase the actual contact area between the brake disc and friction block and thus play a role in reducing wear and dispersing interface contact stress, thereby favoring a rapid transition to a stable wear state. In addition, the design of surface-microgrooved textures optimizes the flow of interface wear debris, thereby facilitating their easy detachment and ejection, maintaining stable fluctuations in the friction force, and further weakening the intensity of the stick-slip vibration. Consequently, enhancing the friction interface contact state is the key to diminishing the stick-slip vibration intensity, and the optimal interface contact degree and mild wear characteristics contribute significantly to this improvement. The conclusions drawn from this study underscore the significance of enhancing the friction interface contact state to reduce stick-slip vibration intensity. The optimal degree of interface contact and mild wear characteristics are key contributors to this improvement. This study demonstrates that surface-microgrooved textures on friction blocks hold significant potential for mitigating friction-induced stick-slip vibrations during the bedding-in phase. The innovation of this study lies in its comprehensive approach to addressing the stick-slip vibration problem in high-speed train braking systems. Integrating finite element simulations with experimental validation provides a thorough analysis of the effectiveness of surface microgrooved textures. The mechanism by which these textures suppress stick-slip vibrations is elucidated, and practical insights into the design and optimization of friction blocks for high-speed trains are offered. |
| Key words: high-speed trains braking textures stick-slip contact behavior |
