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A Study on the Method of Restraining the Ending Effect of Empirical Mode Decomposition (EMD)

XU Bao-jie~(1,2),ZHANG Jian-min~1,XU Xiao-li~2,LI Jian-wei~2(1.School of Mechanical and Vehicular Engineering,Beijing Institute of Technology,Beijing 100081,China;2.Measurement and Control of Mechanical and Electrical System Key Lab of Beijing,Beijing Institute of Machinery,Beijing 100085,China)  
Ending effect is produced in the decomposition process of empirical mode decomposition(EMD) based Hilbert-Huang transformation.It leads to distortion near the two end points of the signal processed.Several methods of restraint aimed at ending effect are proposed.Comparison has been made among the global average statistic method,the parallel line extending method,the polynomial curvefitting method,the mirror extending method and the neural networks extending method.As a result of simulation and experiment,it is shown that ending effect can be effectively restrained.
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