Research on the end effect restraining method of intrinsic time-scale decomposition based on extension

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Journal of Vibration and Shock ›› 2014, Vol. 33 ›› Issue (7) : 165-169.

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Research on the end effect restraining method of intrinsic time-scale decomposition based on extension

XU Yonggang LU Ming FU Sheng ZHANG Jianyu

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Abstract

As a new non-stationary signal process method, The intrinsic time-scale decomposition method (ITD) can decompose a complex non-stationary signal into several proper rotation components (PRCs), but there will be involved end effect in some PRCs. Five end effect mitigation methods to deal with the end effect is proposed in this paper. Including adaptive extension、AR prediction method、 mirror extrema extending、polynomial fitting extending method、anti-symmetric extensions method. Five methods are compared by mathematical simulation. The best one is applying in the simulated signal and bearing fault vibration signals, the results show that the new method can be used to solve the end effect effectively and the fault feature of the mechanical equipments can be extracted .

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Intrinsic time-scale decomposition / End effect / extension / Fault diagnosis

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XU Yonggang LU Ming FU Sheng ZHANG Jianyu. Research on the end effect restraining method of intrinsic time-scale decomposition based on extension[J]. Journal of Vibration and Shock, 2014, 33(7): 165-169