Pole shoe abrasion calculation method of electromagnetic track brake under emergency braking condition

CHEN Shi-an; YANG Xin; YAO Ming; WANG Sheng; Young-bae KIM

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CHEN Shi-an, YANG Xin, YAO Ming, WANG Sheng, Young-bae KIM. Pole shoe abrasion calculation method of electromagnetic track brake under emergency braking condition[J]. Journal of Traffic and Transportation Engineering, 2017, 17(1): 82-92.

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CHEN Shi-an, YANG Xin, YAO Ming, WANG Sheng, Young-bae KIM. Pole shoe abrasion calculation method of electromagnetic track brake under emergency braking condition[J]. Journal of Traffic and Transportation Engineering, 2017, 17(1): 82-92.

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Pole shoe abrasion calculation method of electromagnetic track brake under emergency braking condition

1.
School of Mechanical and Automotive Engineering, Zhejiang University of Water Resources and Electric Power, Hangzhou 310018, Zhejiang, China
2.
School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
3.
Department of Mechanical Engineering, Chonnam National University, Gwangju 61186, Republic of Korea

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Author Bio:
CHEN Shi-an(1973-), male, professor, PhD, +86-571-86929138, chensa@zjweu.edu.cn
Received Date: 2016-11-21
Publish Date: 2017-02-25

Abstract

Abstract

To predict the service lives of pole shoes and ensure brake reliability, the pole shoe abrasion losses of electromagnetic track brakes (ETBs) during emergency brake of high-speed train were calculated through modeling and simulation of abrasion process, braking process and temperature field of brakes and rail.The Archard abrasion model considering speed and temperature and the dynamics model for emergency braking process of CRH2 train were built.Time-varying parameters including air braking force, electromagnetic braking force, brakingdeceleration, energy distribution coefficient of emergency braking, instantaneous speed and braking distance were calculated during the process of test ETBs'whole-process works.The heat transfer among ETBs, rail and atmosphere during emergency brake was analyzed, a 3D temperature field model of brakes and rail was established by using Fluent software.The heat flux of temperature field and the heat dissipation loading condition were obtained according to the time-varying parameters during braking process.The pole shoe abrasion losses of brakes were calculated during emergency braking process of CRH2 train with the running speed of 250km·h^-1.Calculation result shows that the temperature of rail top displays fluctuation changes according to the contact conditions between brakes and rail.The maximum temperature reaches 570.76 ℃in the spot with 1 620 mfrom brake start when the contact between rail and No.8ETB ends.When the active braking time is 24.5s, the maximum temperatures of pole shoes bottoms of those same-side eight ETBs in CRH2 train are 1 022.6℃, 1 037.7℃, 1 045.3, 1 052.8℃, 1 085.7℃, 1 100.9 ℃, 1 109.2 ℃, 1 124.4 ℃in order from front to rear, and the abrasion losses of ETBs pole shoes are 207.4, 208.7, 210.0, 210.7, 212.1, 213.4, 214.4, 215.5g.So, the heat accumulation of rail generates during working process of brakes, which will lead to the higher temperature and larger abrasion losses of latter ETBs'pole shoes in train running direction.
- vehicle engineering,
- electromagnetic track brake,
- time-varying parameters,
- pole shoe abrasion,
- emergency brake,
- abrasion model,
- simulation of temperature field

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References

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