Abstract
Conventional techniques are unfit for processing the non-stationary and nonlinear signal, whereas the empirical mode decomposition (EMD) is a powerful tool for the non-stationary and nonlinear signal analysis and has aroused wide concern recently. However, one principal shortcoming occurring in the EMD is the mode mixing, which makes the physical meaning of the decomposition results obscure. The ensemble empirical mode decomposition (EEMD) is proposed to improve the decomposition results from the EMD method. Firstly, a simulation signal is employed to test the performance of the EEMD method, which demonstrates the superiority over the EMD method. Next, the EEMD method is applied to analyze the signal captured from the deck of the WZ12-1 platform and successfully reveals the reason causing the excessive vibration of the WZ12-1 platform. The results indicate that the EEMD is a hopeful method for the fault identification of the offshore platform.
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