Condition recognition method of rolling bearing based on ensemble empirical mode decomposition sensitive intrinsic mode function selection algorithm

In order to extract effectively the characteristics of each condition vibration signal for rolling bearing, a sensitive Intrinsic Mode Function (IMF) selection algorithm which based on Ensemble Empirical Mode Decomposition (EEMD) is proposed. First, for obtaining the initial characteristics of the vibration signal, the vibration signal is decomposed by using EEMD, and the sensitive components of obtained IMFs are extracted automatically by using kurtosis combined with correlation coefficient. Then, the feature vectors of each condition vibration signal of rolling bearing are obtained by using Singular Value Decomposition (SVD) and AutoRegressive (AR) model. The obtained feature vectors are regarded as the input of the improved hyper-sphere multi-class Support Vector Machine (SVM) for intelligent recognition. Thereby, the condition recognition of normal state, different fault types and different degrees of performance degradation of rolling bearing can be achieved. The experimental results show that, the proposed method can effectively extract fault characteristics information of rolling bearing more than EMD combined with AR model and EMD combined with SVD method, and the recognition rate is higher.