On the difference between empirical mode decomposition and Hilbert vibration decomposition for earthquake motion records

In this paper, Empirical mode decomposition (EMD) and Hilbert vibration decomposition (HVD) are employed to process various different types of non-stationary and nonlinear vibration. The properties of these two methods are systematically analysis by comparing the efficacy in some numerically simulated signals. Meanwhile these two methods are used to analyze a Wenchuan earthquake strong ground motion record to capture low-frequency pulse-like as well as high-frequency wave signals. Some improving strategies are proposed to reduce some disadvantages in these two methods. The result of investigation demonstrates that the combination of EMD and HVD may be more effectively in decomposing multi-component signal.