Modified EEMD de-noising method and its application in multiphase flow measurement

Aiming at the problem that EEMD causes mode mixing that leads to poor noise reduction effect under complex noise background a modified EEMD de-noising method is proposed. In this method, an optimal band pass filter is firstly designed to filter out much of the pulse interference in the analyzed signal, and then the filtered signal is decomposed with EEMD. The selected IMFs are filtered again with SG filter, and the filtered IMFs are reconstructed. The proposed modified EEMD method and EEMD method were applied in the measurement signal filtering of multiphase flow and the measurement of water content percentage, respectively. Experiment results show that compared with EEMD method, the proposed modified EEMD method improves the SNR by about 2-3dB, has better filtering performance; and the average measurement accuracy of water content percentage is improved by about 3%, the measurement error is smaller.