Volume 23 Issue 6
Dec.  2023
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2023  >  23(6): 206-215
LI Miao, MA Ya-qun, WANG Yu, LUO Shi-hui, MA Wei-hua, LEI Cheng. Strength evaluation of levitation frame for medium and low speed maglev train based on full-scale bench test[J]. Journal of Traffic and Transportation Engineering, 2023, 23(6): 206-215. doi: 10.19818/j.cnki.1671-1637.2023.06.013
Citation: LI Miao, MA Ya-qun, WANG Yu, LUO Shi-hui, MA Wei-hua, LEI Cheng. Strength evaluation of levitation frame for medium and low speed maglev train based on full-scale bench test[J]. Journal of Traffic and Transportation Engineering, 2023, 23(6): 206-215. doi: 10.19818/j.cnki.1671-1637.2023.06.013
shu

Strength evaluation of levitation frame for medium and low speed maglev train based on full-scale bench test

doi: 10.19818/j.cnki.1671-1637.2023.06.013
  • 1.

    State Key Laboratory of Rail Transit Vehicle System, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

    CRRC Changchun Railway Vehicles Co., Ltd., Changchun 130062, Jilin, China

  • 3.

    Henan Engineering Research Center of Rail Transit Intelligent Security, Zhengzhou Railway Vocational and Technical College, Zhengzhou 451460, Henan, China

Funds:

National Natural Science Foundation of China 51875483

Independent Funded Research Project of State Key Laboratory of Traction Power 2020TPL-T01

Independent Funded Research Project of State Key Laboratory of Traction Power 2020TPL-T04

More Information
    Abstract
  • In order to evaluate whether the levitation frame of a medium and low speed maglev train meets the requirements of strength, the static strength and fatigue strength tests of the levitation frame were conducted by using the self-developed full-scale medium and low speed maglev strength test bench. According to the finite element analysis and the results obtained from multi-body dynamics simulation, the stress concentration position and bearing characteristics shown by the levitation frame were determined, followed by the reasonable arrangement of measuring points in a series on the levitation frame. The signals of strain response shown by the levitation frame of the train under three types of working conditions were measured, including extraordinary load, simulated main operation load, and simulated special operation load. Based on the material properties displayed by different parts of the levitation frame, the stress level of the levitation frame was evaluated through transformation calculation. Research results show that in the static strength test, large stress points of the levitation frame are mainly distribute at the corner of the bracket, the connection point between the mounting seat of support wheels and the anti-rolling beam, and the mounting seat of the parking brake sled, while the weak point obtained from the fatigue strength test is mainly at the weld joint between the longitudinal beam and the bracket. In comparison with the conventional operating conditions of the train, the stress amplitude values of the static strength and fatigue strength of the levitation frame increase by 1.06 and 4.77 times respectively under special operation conditions such as levitation failure and overloading braking. The maximum tensile stress and compressive stress of the levitation frame under all test conditions are 67.22 and -20.30 MPa, respectively, with the minimum safety factor as 1.71, indicating that the levitation frame meets the structural strength requirements. All the test data are within the envelope of the Goodman-Smith fatigue limit diagram of the corresponding material, indicating that the levitation frame meets the fatigue strength requirements. Through penetration inspection, it is identified that no cracks are found at any position of the levitation frame, which verifies the reliability of fatigue strength evaluation results of the levitation frame.

     

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