Signal Based Fault Detection and Diagnosis for Rotating Electrical Machines: Issues and Solutions - Complex System Modelling and Control Through Intelligent Soft Computations - page 295

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Fig. 6 Residuals of the accelerometer placed at the drive end. a Healthy motor at D 2 detail scale.
b Rolling element fault of drive end bearing at D 1 detail scale. c Inner raceway fault of drive end
bearing at D 4 detail scale