Facing the fact that fault diagnosis in engineering practice is limited by many factors
including the lack of prior knowledge of faulty components
modulation of vibration signals and interference due to various noise
an adaptive filtering algorithm based on mathematical morphology is proposed for rolling bearing fault diagnosis. Following the principle of basic and combined morphological operators
characteristics of each kind of morphological operator and the quantitative effect of varying structure element scale on filtering results are revealed by amplitude-frequency response method of non-linear filter. Besides
the main features of running faulty bearing are obtained while a selection strategy of structure element scale is determined after discussion on the physical model and corresponding vibration signal of typical faulty rolling bearing. The feasibility of this method is validated by numerical simulations. Compared with optimal parameter CMFH method
the proposed adaptive method detects the information more quickly
clearly and accurately from signals of rolling bearing with outer or inner race fault. The FAER index of processed signal and efficiency of signal processing are at least heightened by 29.8% and 50.0%
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