Extraction of vibration components from a rotating propeller model based on complex empirical mode decomposition

In this paper, we present extraction of vibration components embedded in signatures from rotating propellers. In order to deal with complex-valued signatures, complex empirical mode decomposition (CEMD), an extended version of EMD, is employed to extract the vibration components. With FEKO simulation, we obtain composite signatures induced by both rotation and vibration of the simply modeled propeller for two different cases. Then CEMD is applied to these signatures and the reconstructed vibration components are analyzed in the joint time-frequency domain. The estimated vibration-related parameters showed reasonable agreement with actual motion parameters. This paper shows good possibility of predicting new characteristics from rotating propellers.