Abstract: When the international standard of bench test is adopted to evaluate the fatigue of metro bogie frame, the actual working condition of the line will not be completely covered. In order to evaluate the fatigue reliability of the frame more accurately, based on the comprehensive analysis of the requirements of the frame life assessment and the control scheme of th e test-bed, the determination method of the load phase relationship and the load frequency is given. According to the fatigue theory in the frequency domain and the principle of damage consistency, the method of acceleration programming load spectrum compilation suitable for different phase and multi channels loading based on the measured data of the line load and stress of the frame is proposed. The damage calculation results show that the damage rate calculated by the load spectrum based on the measured data has covered the measured damage rate, and the calibrated damage ratio ranges from 1.04 to 6.47. The error band of frequency-domain method and time-domain method is between 8.33% and 18.60%, which shows that the proposed compilation method of load spectrum for the bench test can accurately reflect the stress response of the structure under load coupling. The research results provide a new idea for the establishment of multi channels bench test spectrum of metro bogie frame based on the measured data.

Key words: bogie frame, bench test, frequency domain fatigue, UIC standard, correlation