Volume 19 Issue 5
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Article Navigation >  Journal of Traffic and Transportation Engineering  > 2019  >  19(5): 74-83
ZHANG Zi-fan, LI Qiang, DING Ran, LIAN Qing-lin. Frequency domain calibration and establishment method for load spectrum of bogie frame[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 74-83. doi: 10.19818/j.cnki.1671-1637.2019.05.008
Citation: ZHANG Zi-fan, LI Qiang, DING Ran, LIAN Qing-lin. Frequency domain calibration and establishment method for load spectrum of bogie frame[J]. Journal of Traffic and Transportation Engineering, 2019, 19(5): 74-83. doi: 10.19818/j.cnki.1671-1637.2019.05.008
shu

Frequency domain calibration and establishment method for load spectrum of bogie frame

doi: 10.19818/j.cnki.1671-1637.2019.05.008

  • School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China

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    Abstract
  • The quasi-static load-stress transfer relationship in time-domain was analyzed. The parameters of cross-spectral density between loads were taken as the characterization of load coupling effect. Based on the basic theory of multi-axis frequency-domain fatigue, the expression of equivalent stress in frequency-domain was derived. The expressions of discrete load system equivalent to the multi-axis load were obtained. In order to ensure that the damage calculated by load spectrum can cover the measured damage of test line, the 0-order spectral moment of the self-power spectral density of stress signal was taken as the parameter to characterize the damage, and the contribution ratio of load to the damage at the measured point was restrained. According to the principle of damage consistency, load calibration was carried out by using the NSGA-Ⅱ multi-objective optimization algorithm. The line test on a domestic metro bogie frame was carried out, the load and stress data were obtained, and the data processing and analysis were carried out. Analysis result shows that in the load system, the measured variance of the transverse load of frame is the largest, which is 5.08, and the variance of the transverse load of motor is the smallest, which is 0.02. The damage calibration accuracy considering load coupling effect in frequency domain is 1.08×10-5, while the damage calibration accuracy using the time-domain discrete spectrum is 2.91×10-3. The calibration accuracy of frequency-domain method is 99.63% higher than that of time-domain method. The comprehensive adjustment multiple of load calibration coefficient considering the coupling effect in frequency domain is 31.81, which is 41.71% lower than that using the discrete spectrum in time domain. The maximum coefficient adjustment multiple of frequency-domain method is 6.99, and the multiple of time-domain method is 15.68, the former is 55.42% lower than the latter. So the calibration method considering the load coupling effect in frequency domain is superior to the calibration method using the discrete spectrum in time domain in terms of error accuracy. The dispersion of coefficient adjustment ratio of frequency-domain method is lower than that of time-domain method. The calibration load is closer to the measured load, and the reliability of calibration results is high. Because the correlation between loads is taken into account in the calibration process, the load system can be applied to multi-axis loading of test bed and independent loading of simulation. The unification of the two loading modes is realized, which provides a new idea for the establishment of frame load spectrum.

     

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