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| Effects of hole structure of brake pad friction block on stick-slip vibration of disc-block interface |
| WANG Quan1,2, WANG Zhiwei1,2, MO Jiliang1,2, FAN Zhiyong1,2, ZHOU Zhongrong1,2 |
| 1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2. State Key Lab of Rail Transit Carrier System, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract The perforated structure is widely adopted on the surface of the brake pad friction block to improve interfacial friction, wear behaviors and heat distribution characteristics. To further investigate the relationship between the perforated structure of the brake pad friction block and stick–slip vibration of the disc–block interface, in this research, the tribological experiments are conducted to analyze the stick–slip vibration respectively affected by perforated and unperforated friction blocks. The Stribeck model parameters are identified to characterize the coefficients of friction of the disc–block interface. Further, a numerical model of the disc–block friction system is constructed. Based on the identified Stribeck model parameters and the theoretical analysis, the key influence factors of stick–slip motion is discussed and the mechanism of the perforated structure of the friction block on stick–slip vibration is revealed. The results show that the negative damping effect generated from the negative friction–velocity slope continuously inputs energy into the disc–block friction system, causing the instability and stick–slip vibration of the system. A greater difference between the static and kinetic coefficients of friction results in a stronger negative damping effect, leading to more obvious stick–slip vibration and worse stability of the system. The difference between the static and kinetic coefficients of friction for the perforated friction block is less than that for the unperforated friction block through regulating the interfacial friction characteristics, thereby effectively reduces stick–slip vibration of the disc–block interface and improves the system stability.
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Received: 31 July 2023
Published: 15 June 2024
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