| KANG Xi,CHEN Guang-xiong,ZHU Qi,DONG Bing-jie.Influence of Axle-Mounted Disc Brake on Polygonal Wear of High-Speed Train Wheels[J],51(3):43-50 |
| Influence of Axle-Mounted Disc Brake on Polygonal Wear of High-Speed Train Wheels |
| Received:March 19, 2021 Revised:August 30, 2021 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.003 |
| KeyWord:axle-mounted disc brake system wheel polygonal wear friction-induced self-excited vibration numerical simulation high-speed trains surface groove |
| Author | Institution |
| KANG Xi |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China;Tribology Research Institute, Chengdu , China |
| CHEN Guang-xiong |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China;Tribology Research Institute, Chengdu , China |
| ZHU Qi |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China;Tribology Research Institute, Chengdu , China |
| DONG Bing-jie |
School of Mechanical Engineering, Southwest Jiaotong University, Chengdu , China;Tribology Research Institute, Chengdu , China |
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| Abstract: |
| In order to study the formation mechanism of wheel polygonal wear on high-speed trains and propose corresponding inhibition measures. Based on the viewpoint that the friction-induced self-excited vibration causes wheel polygonal wear, a finite element model including high-speed train trailer wheelset, axle-mounted disc brake system and track was established. The vibrations excited by the friction between discs and pads under brake conditions were analyzed by the complex eigenvalue method. According to the effective damping ratio to judge the instability of excited vibrations, the smaller the effective damping ratio, the stronger the occurrence trend of unstable vibration. When the effective damping ratio was less than –0.001, the amplitude of unstable vibrations increased gradually overcoming the system damping. The wheel-rail normal contact forces during braking were obtained by the transient dynamic simulation, which took into account the influence of nonlinear factors. And then, the main frequencies of wheel-rail vibrations were calculated by the power spectral density (PSD) analysis of the wheel-rail normal contact forces. In addition, it was investigated that the effect of the position of the axle-mounted disc brake system and three types of brake pads on wheel polygonal wear. Friction braking of axle-mounted disc brake system was easy to excite unstable vibration about 637 Hz. Because of the difference between complex eigenvalue analysis and instantaneous dynamic analysis, there was a relative error of about 6% in the calculation results of the unstable vibration frequency. The installation position of the axle-mounted disc brake system had an important influence on the occurrence trend of unstable vibration. Considering the actual installation space of the axle-mounted disc brake system, when the brake pressure angle was in the range of –10° to 10°, the equivalent damping ratio corresponding to the vibration about 637 Hz decreased with the increase of the pressure angle. Brake pads composed of several honeycomb brake units could cause unstable vibration of about 602 Hz during braking. When there was a composite groove structure on the surface of the brake pad, there was no unstable vibration with equivalent damping ratio less than –0.001 in the frequency range of 550~650 Hz. Results show that when the high-speed train runs at 300 km/h, the unstable vibration of 637 Hz caused by axle-disc friction braking can be transmitted to the wheel-rail system through the wheelset, which causes the periodic fluctuation of wheel-rail friction work and leads to 22~23 order polygonal wear of trailer wheels. Under the condition of meeting the installation requirements of braking system, increasing the pressure angle properly can reduce the wheel polygon wear caused by axle-disc braking. Using the brake pads consisted of multiple honeycomb brake units can easily cause trailer wheels to occur 20~21 order polygonal wear, and 19~23 order wheel polygonal wear caused by axle-mounted disc brake is greatly suppressed by using the brake pads with groove-textured surface. |
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