Volume 22 Issue 4
Aug.  2022
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DAI Zhi-yuan, LI Tian, ZHOU Ning, ZHANG Ji-ye, ZHANG Wei-hua. Effect of upper and lower arms diameters on aerodynamic uplift force of high-speed pantograph[J]. Journal of Traffic and Transportation Engineering, 2022, 22(4): 210-222. doi: 10.19818/j.cnki.1671-1637.2022.04.016
Citation: DAI Zhi-yuan, LI Tian, ZHOU Ning, ZHANG Ji-ye, ZHANG Wei-hua. Effect of upper and lower arms diameters on aerodynamic uplift force of high-speed pantograph[J]. Journal of Traffic and Transportation Engineering, 2022, 22(4): 210-222. doi: 10.19818/j.cnki.1671-1637.2022.04.016
shu

Effect of upper and lower arms diameters on aerodynamic uplift force of high-speed pantograph

doi: 10.19818/j.cnki.1671-1637.2022.04.016

  • State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

Funds:

National Key Research and Development Program of China 2020YFA0710902

National Natural Science Foundation of China 52072319

Science and Technology Research and Development Program of China Railway P2020J025

Science and Technology Research and Development Program of China Railway K2021J004-B

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    Abstract
  • The pantograph models for the upper arms with seven different diameters and those for the lower arms with seven different diameters were built, and the aerodynamic numerical simulations of pantographs were carried out. The aerodynamic uplift forces of pantographs were calculated by using the multi-body dynamics method, and the effects of the upper and lower arm diameters on the aerodynamic performances and aerodynamic uplift forces of pantographs were studied from the perspective of the aerodynamic force and flow field characteristics. Research results show that both the aerodynamic lift force of the upper arm and the aerodynamic uplift force of the pantograph are larger with the rise of the upper arm diameter and are smaller with the rise of the lower arm diameter under the knuckle-downstream operating conditions, but the effect of the lower arm diameter on the aerodynamic uplift force of the pantograph is small. Moreover, both the aerodynamic lift force of the upper arm and the aerodynamic uplift of the pantograph lessens with the increase of the upper arm diameter and raises with the increase of the lower arm diameter under the knuckle-upstream operating conditions. The aerodynamic resistance of the bar of the upper arm only accounts for 3%-10% of that of the upper arm, and the aerodynamic lift force accounts for 26%-55% of that of the upper arm under both the knuckle-downstream and knuckle-upstream operating conditions. The aerodynamic resistance of the bar of the lower arm accounts for 10%-25% of that of the lower arm, and the aerodynamic lift force accounts for 43%-68% of that of the lower arm under the two conditions. The change of diameter has a great influence on the aerodynamic lift forces of the upper and lower arms and a small effect on the aerodynamic resistances. In addition, the absolute values of the aerodynamic resistances of the upper and lower arms under the knuckle-upstream operating conditions are greater than those under the knuckle-downstream operating conditions. 16 figs, 31 refs.

     

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