Synthesis of running rms-induced non-Gaussian random vibration based on Weibull distribution

摘要

Field random vibration is usually non-Gaussian, which makes ordinary random vibration testing unable to simulate the fatigue damage that products will experience in field.A new method is proposed in this paper to synthesize running RMS-induced non-Gaussian vibration based on the probability distribution of running RMS (root mean square), which is simulated by using the two-parameter Weibull distribution.Shock response spectrum (SRS) is used to detect significant transients within signals.The synthesized non-Gaussian signal has the same PSD,kurtosis and PDF (probability density function) as the field data.Fatigue damage spectrum (FDS)is used as another proof of the effectiveness of this proposed new method.