改进的EEMD方法及其在滚动轴承故障诊断中的应用

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Abstract In order to deal with the problem that ensemble empirical mode decomposition (EEMD) method only considers the effect of the amplitude of the noise on the decomposition results, and the added white noise cannot be neutralized completely, an improved EEMD method was proposed by analyzing the influence of maximum frequency of noise on the decomposition results.The number of ensemble members was fixed to 2, and then the noise was added to the signal with different maximum frequency and amplitude.After the traversing, the result with the minimal orthogonal coefficient was selected as the final decomposition result.At the same time, the complementary EEMD (Complementary EEMD, CEEMD) method was used to reduce the effect of residual noise.Through the simulation signal and the measured signal analysis, the results show that the improved method has some advantages in suppressing mode mixing and fault diagnosis compared with the original method.

Key words： EEMD mode mixing maximum noise frequency fault diagnosis

Received: 24 August 2016 Published: 15 August 2018

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2018/V37/I16/51

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