Research on Super-Gaussian Random Vibration Test Technology of Locomotive Equipment Based on Measured Data

Aiming at the problem that the measured data of Lanzhou West-Urumqi west line shows super-Gaussian and the traditional induction method cannot be applied to theinduction of super-Gaussian vibration data, an induction method for super-Gaussian random vibration data of locomotive equipment is proposed.Applying this method, the measured PSD of the X, Y and Z directions of the locomotive equipment is summarized, and the acceleration factor of this vibration test is calculated to be 5.66.The average kurtosis values in the X, Y, and Z directions are 6.48, 6.58, and 6.81, respectively.Based on this, the measured accelerated super-Gaussian random vibration test profile of locomotive equipment is constructed.Through comparison, it is found that the relative differences of the acceleration RMS value and the kurtosis value between the measured profile and the IEC 61373:2010 profile are 3.29%-197.13% and 116%-127% respectively, and the frequency range of the measured profile is 2Hz-350 Hz, larger than that of the standard 2Hz-150 Hz.At the same time, two groups of CPU boards were tested by using the measured super-Gaussian test profile and IEC61373:2010 test profiles respectively. Six kinds of fault modes were generated in the test. Among them, 83.3% of the total fault modes were caused by the measured profiles and 16.7% by the standard profiles.The fault mode excited by the measured profile is highly consistent with the on- site fault mode, indicating that the measured super-Gaussian vibration profile can more realistically simulate the vibration environment of the locomotive equipment.