Life cycle vibration analysis based on EMD of rolling element bearing under ALT by constant stress

Bearing is one of critical rotation components in mechanical systems. Many grievous accidents of mechanical systems are chiefly caused by bearing failure. So it´s significant meaningful for practical application to research failure feature detection and residual life prediction of key rotation components such as bearings. This paper has designed experimental scheme of accelerated life test of rolling element bearings and gained all vibration signals of bearings through their total life, from normal to fault. Then we extracted failure feature from those signals and analyzed its evolving rule in the bearing life cycle based on empirical mode decomposition (EMD). Finally, we have analyzed bearing failure feature in each stage through its life cycle by comparing Frequency Spectrums with Hilbert Marginal Spectrums.