Signature Analysis Based on Improved EMD with High-order Spline Interpolation

Abstract

Empirical mode decomposition (EMD) is proved to be an effective tool for the nonlinear and non-stationary signals.  Many researchers have studied the application of EMD in a variety of fields. But few in-depth studies are related to the improvement of EMD. A new signal analysis approach based on improved EMD method is introduced in this paper. Firstly, the basic principle of EMD is introduced. Then the influence of spline interpolation’s EC to the EMD is investigated. In addition, the EMD based on high-order spline interpolation is used to improve the precision of the algorithm. Furthermore, the fast EMD is developed in order to improve the computation efficiency and precision. From what has been discussed above, we may safely draw the conclusion :(a) The EMD algorithm based on high-order spline interpolation can improve the precision remarkably while the calculation time is increased. (b) As the order of spline interpolation increasing, the precision of algorithm is not proportionable. The precision will not be improved when the order is up to certain order.