Abstract：In Empirical mode decomposition (EMD) method,the upper and lower envelopes fitted by cubic spline interpolation (CSI) may often occur undershoots phenomenon and mode mixing problem.The Piecewise Cubic Hermite interpolation (PCHI) is not flexible enough.A new quadratic Hermite interpolation algorithm for EMD envelope based on PSO is proposed.The algorithm can adjust the shape of the curve with the shape parameters,and find the optimal smooth envelope by PSO.The experimental result of simulation signal and nonstationary signals show that,the proposed algorithm can effectively overcome the undershoot problem caused by the traditional method,improve the modal aliasing effect,the IO and IEC of the decentralized IMF components are superior to the traditional method.
刘毅, 宋余庆, 刘哲. 基于有理四次Hermite插值和PSO的EMD包络线拟合算法[J]. 电子学报, 2018, 46(11): 2761-2767.
LIU Yi, SONG Yu-qing, LIU Zhe. An EMD Envelope Fitting Algorithm Based on Rational Quadratic Hermite Interpolation and PSO. Acta Electronica Sinica, 2018, 46(11): 2761-2767.
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2018, Vol. 46 
