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Study on Moving Detrended Fluctuation Analysis Applied in Machinery Fault Diagnosis
GUO Yu-xiu;ZHANG Jin-min;YUAN Jing
2011, 31 (5):
137-141.
DOI: 10.3969/j.issn.1006-1355-2011.05.032
The method of Moving Detrended Fluctuation Analysis (MDFA) is studied, and the scaling exponent of the signal time sequence is obtained. It is found that the scaling exponent fluctuates greatly at the signal mutation point, while it fluctuates slightly in the trouble-free places. Thus, MDFA method can be used to detect the mutations in engineering signals. In this paper, the MDFA method is applied to the simulation of the signals due to mutation faults in gears and bearings, and the results show that the MDFA method is effective in mutations fault diagnosis of rotary machines.
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