The fluorescent lights of the reliability center hummed with a monotony that matched the hum of the plant outside. Elias, a young vibration analyst with fresh credentials and ink-stained fingers, sat before a monitor that poured out a waterfall of spectral data.

: High-frequency "noise" and specific defect frequencies (like BPFI or BSF) that appear long before a total failure. Mechanical Looseness

: Categorizes issues like mass unbalance , mechanical looseness , bent shafts , and gear wear .