| Citation: | ZHOU Gaowei, GAO Fei, DUAN Junjun. Experimental Study on Temperature Distribution of Wheel Tread under Continuous Braking on Super-Long Large Ramp[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20240238 |
To investigate the effects of continuous braking conditions on the maximum temperature and temperature difference of wheel tread and clarify thermal load characteristics of the wheel, continuous braking tests on the super-long large ramp were conducted on a 1∶1 brake test bench, with the friction pair of brake shoe and wheel tread taken as the research object. The distribution pattern of tread temperature during braking was analyzed by changing three key parameters: braking pressure, speed, and duration. Results demonstrate that when the braking speed increases from 40 km/h to 70 km/h, the maximum temperature during the three braking phases (0–1 200 s, 1 200–2 400 s, and 2 400–3 600 s) increases by 97%, 118%, and 86%, respectively, and the maximum temperature difference rises by 113%, 150%, and 128%, respectively. The increase in braking speed exerts a greater influence on temperature difference during the first two stages, which is attributable to the lower temperature of the initial friction surface and the wear-resistant properties of brake shoe contact areas that constrain expansion of contact areas. At a braking speed of 70 km/h, when the braking pressure increases from 3 kN to 7 kN, the maximum tread temperature increases from 321 ℃ to 436 ℃, representing a 36% increase. The increase in the braking pressure enhances the friction power and amplifies the effect of local contact on the friction temperature, which further exacerbates the uneven distribution of tread temperature. Under the braking pressure of 3 kN, augmentation of speed from 40 km/h to 70 km/h increases the maximum tread temperature from 176 ℃ to 328 ℃, representing an 86% increase. Increasing the braking speed can boost braking energy and increase braking power, which significantly expands the high-temperature regions. This study can provide a reference for analyzing the tread braking performance and developing operational strategies of rolling stock under super-long large ramps.
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