When plain bearings fail it is a sudden and often catastrophic event. Unlike roller bearings which present higher friction forces, plain bearings work under a thin microfilm of lubricant. Where roller bearings present a gradual failure trend, plain bearings have consistent baselines that change with a small warning window. Monitor their condition with ultrasound. Static data is trended at frequent intervals and dynamic signals are assessed in the time domain. For very large plain bearings it is necessary to collect ultrasound data from multiple points on the bearing house.

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Tip Provided By Allan Rienstra, SDT Ultrasound Solutions