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LU Yao-hui, XIANG Peng-lin, CENG Jing, CHEN Tian-li. Dynamic stress calculation and fatigue whole life prediction of bogie frame for high-speed train[J]. Journal of Traffic and Transportation Engineering, 2017, 17(1): 62-70.
Citation: LU Yao-hui, XIANG Peng-lin, CENG Jing, CHEN Tian-li. Dynamic stress calculation and fatigue whole life prediction of bogie frame for high-speed train[J]. Journal of Traffic and Transportation Engineering, 2017, 17(1): 62-70.
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Dynamic stress calculation and fatigue whole life prediction of bogie frame for high-speed train

  • 1.

    School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031, Sichuan, China

  • 2.

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

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  • Author Bio:

    LU Yao-hui(1973-), male, associate professor, PhD, +86-28-87634572, yhlu2000@swj

  • Received Date: 2016-10-20
  • Publish Date: 2017-02-25
    Abstract
  • The rigid-flexible dynamics model of vehicle structure was established, the vibration responses of rigid and flexible bogie frames were compared, and the load spectrums of bogie frames were calculated.The transformation method of stress spectrum was analyzed, and the dynamic stress spectrums were computed by using the finite element method and the polynomial fitting method.On the basis of computed dynamic stress spectrums and related standard, the full fatigue life of bogie frame was calculated by using the linearly cumulative damage theory and the fatigue crack growth life's Paris equation.Computation result shows that when the natural frequency of bogie frame is 36.94-95.53 Hz, the amplitude of vibration acceleration response for bogie frame is greater with the vehicle system dynamics model considering flexible bogie frame than the multi-rigid-body vehicle system dynamics model, so the vibration modes of bogie frame have significant contribution on the vibration responses.When the load spectrums are convertedto the stress spectrums by using the polynomial fitting method and the transient analysis method, the maximum error of stress is 1.16 MPa, and the relative maximum error of stress is less than3% that meets the engineering analysis's calculation accuracy requirement of 5%.When the degree of reliability is 95%, the fatigue life of bogie frame is 1.82×106 km based on the fatigue damage cumulative theory.When the crack at the dangerous concern of bogie frame grows from 1mm to 2mm, the propagation life is 1.76×106 km that meets the fifth level maintenance period requirement of 1.2×106 km in China high-speed train maintenance standard.Obviously, the calculation method of dynamic stress spectrum based on the dynamic modes of bogie frame and the prediction method of fatigue full life for bogie frame are reliable, which is meaningful for the dynamic design and the maintenance cycle making of bogie frame.

     

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