Research on the analysis and purification of the axis orbit of the hydropower unit based on EEMD and correlation coefficient

There will be interference signals in the process of collecting the swing signal of the main shaft of the hydropower unit, and the axis orbit will be deformed and disordered, so it is impossible to judge the operation state of the main shaft. Therefore, it is necessary to carry out the purification research of the axis orbit. In this paper, Empirical Mode Decomposition (EMD) and ensemble empirical mode decomposition (EEMD) are compared and analyzed. The comparison of the two reconstruction methods used and the comparison of the axis orbit formed by the signals reconstructed by the components of different correlation coefficients in EEMD prove the superiority and reliability of the axis orbit purification method based on the EEMD and correlation coefficient which provides a new method for fault diagnosis of the rotor system.