This paper provides a review of the literature on condition monitoring of a gearbox. The progress and changes over the past 30 years in failure detection techniques of rotating machinery including helicopter transmission are reviewed. Vibration Analysis techniques, indicators and parameters used in condition monitoring are arranged in a historical perspective. The use of vibration-based analysis damage detection techniques is classified and discussed in details. The capability of each technique to sense failure and damage in rotary equipments is addressed. These diagnostics techniques in gearbox condition monitoring are organized and regrouped in this review paper in a better approach so they can be easily recognized.
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