Study on the Classification and Verification of Bogie Frame Loads of the High-speed EMU

doi:10.3901/JME.2021.06.156

Abstract

Abstract: Studying on the basic force system of the bogie frame of high-speed electric multiple unit(EMU) tallies with the mechanism and application of the complete frame load spectra, and further characterizes the damage of the bogie frame effectively and safely when the bogie is in service. Accordingly, in this paper, some in-depth researches are presented. Firstly, the instrumented bogie frame is made by high precision decoupling technology, and the degree of freedom and loading action mode of the bogie frame when it is in "In-Position State" are simulated accurately, in order to carry out the quasi-static calibration of the frame. Meanwhile, the load and stress histories of main trunk lines in China are obtained simultaneously based on the long-term tracking test. In addition, derived from the analysis of the motion mode and load-bearing function, 17 quasi-equilibrium force systems of the bogie frame are constructed by extracting all the loads with the aim that it is in an equilibrium state. Furthermore, it also proves the validity and effectiveness of proposed research results. The quasi-equilibrium force systems proposed is proved to fully reflect the fatigue damage. This proving is obtained by analyzing the characteristics of stress response at the fatigue control site of the bogie frame both in time and frequency domains with measured loads data, and taking the synchronous EMU running status signals into consideration. Also, the basic load system is verified to conform to the time-frequency characteristic of critical region of the bogie frame, which is realized according to the Pearson correlation coefficient in time domain and the power spectrum and coherence in frequency domain. Further, the integrity of basic load system is confirmed with the damage contribution proportion of each load. Given the above, it shows that the research results own vital significance to establish complete frame load spectra of the high-speed EMU.

Key words: high-speed EMU, equilibrium force system, line test, time-frequency characteristics, load spectra

CLC Number:

U260

ZHANG Yayu, SUN Shouguang, WANG Binjie, YIN Zhenkun, LI Qiuze, WANG Wenjing. Study on the Classification and Verification of Bogie Frame Loads of the High-speed EMU[J]. Journal of Mechanical Engineering, 2021, 57(6): 156-163.

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