Abstract:

Standards IEC61373 of version 1999 and version 2010 are analyzed and compared, and it’s found that the severity levels for random vibration test of the two versions are the same. However, due to the change of the calculation method of acceleration ratio, the severity level for simulating the long life testing at increased random vibration levels is significant declined. In order to compare differences between field measurement data of railway line and vehicle in China and the standard IEC61373, the acceleration vs. time history of HXD1C electric locomotive in poor condition like Lanzhou-Xinjiang railway line, and that in good condition like Zhuzhou-Guangzhou section of the Beijing-Guangzhou railway line are measured separately. According to the data processing and the analysis, it is indicated that the vibration level and standard deviation of measured data in China are relatively large and the data are comparatively discrete. The random vibration simulations for traction converter of HXD1C electric locomotive are carried out by using the functional acceleration spectral density (ASD) of standard IEC61373 and the measured data as excitation respectively. Compared with the obtained results of standard spectrum, the maximum 1σ stress of measured spectrum is higher by 2.4% in vertical, 9.0% in transverse and 22.8% in longitudinal directions respectively, which indicates that the maximum 1σ stress of typical equipments excited by measured spectrum is greater than that of the standard spectrum.

Key words: acceleration spectral density, data processing, railway vehicle, random vibration, IEC61373