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Vibration signals under the three bearing operating conditions. (a) Normal condition. (b) Cage cracking. (c) Rolling element Pitting. (d) Inner race stripping with a size of 4 mm × 0.3 mm. (e) Inner race pitting. (f) Outer race stripping with a size of 4 mm × 0.3 mm. (g) Outer race pitting. (h) Inner race and Rolling element pitting. (i) Inner race and Outer race pitting.
