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Collected signals of Ball Fault with fault depth 0.014 inch under different working conditions. The horizontal axis represents the time and the horizontal axis are the acceleration data. Four vibration signals under load conditions of 0, 1, 2, 3 from the drive end are shown in (a–d), respectively. Four vibration signals under load conditions of 0, 1, 2, 3 from the fan end are shown in (e–h), respectively.
