Incipient Fault Detection for Rolling Element Bearings under Varying Speed Conditions.

Especially when the generator speed gradually decreases, the PP values also have a decreasing trend around 6000 h.

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The proposed alarm trigger mechanism is composed of two criteria: (1) in a sliding time window, the number of indicator values above the adaptive threshold has exceeded a safety number; and (2) the indicator values in the sliding time-window present an increasing trend, which is evaluated by the Spearman coefficient.

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