Load Characteristics and Fatigue Damage Assessment of High Speed Train Bogie Frame

doi:10.3901/JME.2020.10.163

Abstract

Abstract: The axle box spring force sensor and primary shock absorber force sensor are made by using load calibration method. The vertical load time history of the motor vehicle frame is obtained by line test. Combined with vehicle-borne GPS signal and gyroscope signal, the changing characteristics of frame load under typical working conditions such as train starting acceleration, high and low speed linear running, line curve passing, motor torque fluctuation, braking and parking are analyzed. The fatigue hazard zone at the end of the frame and the relationship between load and stress are determined by finite element simulation analysis. Then the stress amplitude spectrum of the frame under axle box spring load, primary shock absorber load and coupling load is compiled. Finally, the fatigue damage distribution of the frame is calculated according to the linear cumulative criterion of fatigue damage. The results show that compared with the non-powered side of the frame, the axle box spring load of the powered side of the frame is greatly affected by the output torque of the motor, especially in the conditions of train starting, braking and motor torque fluctuation. Under the single action of axle box spring load and primary shock absorber load, the stress distribution at the end of the frame is basically the same, and the maximum load-stress transfer coefficient is 6.56 MPa/kN. Under the coupling load, the fatigue damage value at each measuring point of the frame is higher than that under the single action of axle box spring load and primary shock absorber load. When the train speed increases from 200 km/h to 350 km/h, the cumulative damage value at first side of the frame increases from 0.078 to 0.435, which increases about 4.6 times. At the same speed level, the fatigue damage parameters of the primary shock absorber load are larger than that of the axle box spring load. The research results can provide some theoretical reference for the optimization design and simulation analysis of welded frame.

Key words: bogie frame, axle box spring, primary shock absorber, load characteristics, fatigue damage

CLC Number:

U260

ZHANG Yayu, SUN Shouguang, YANG Guangxue, LI Guangquan. Load Characteristics and Fatigue Damage Assessment of High Speed Train Bogie Frame[J]. Journal of Mechanical Engineering, 2020, 56(10): 163-171.

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