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. 2023 Aug 30;23(17):7546. doi: 10.3390/s23177546

Figure 4.

Figure 4

Real vibration signals from an online database (CRWU) for the three different failure classes; top: outer race, mid: inner race, bottom: ball. The signal to noise ratio decreases in inner race defect and the ball defect signals, due to the decreased amplitude of the vibrations, caused also by larger distance between the sensor and the defect.