Bearings and gearboxes have many advantages such as compact structure, low friction, high transmission efficiency, and stable transmission ratio. Thanks to these unique metrics, bearings and gearboxes are widely used as transmission systems in wind turbines, ships, vehicles, and advanced manufacturing. However, bearing and gearbox transmission systems usually operate in harsh working environments, which makes the bearing and gear subject to fatigue and failure. Bearing and gearbox fatigue and failure can cause a sudden shutdown of the transmission system and bring unexpected economic loss, and even serious accidents. Therefore, it is necessary to monitor the health status of bearing and gearbox transmission systems so that proper maintenance strategies can be scheduled in advance, which can significantly benefit industry practices and safety operations.

Vibration analysis is a prevalent tool to monitor the operating condition of the bearing and gearbox transmission system. The bearing and gearbox in a healthy state have a certain vibration signature. Fatigue and failure development can change that signature in a way that can be related to the fault. Thus, vibration analysis has been recognized as an effective approach for condition monitoring of bearing and gearbox transmission systems.

This Special Issue will focus on advanced and innovative vibration analysis techniques to monitor the health condition of bearing and gearbox transmission systems, including their vital components such as gears, bearings, shafts, couplings, and motors. Original research and review articles are welcome.

Potential topics include but are not limited to the following:

• Vibration-based bearing and gearbox diagnostics
• Dynamic analysis for bearing and gearbox transmission system condition monitoring
• Digital twin-based bearing and gearbox transmission system fault diagnostics and prognostics
• Remaining useful life prediction of the bearing and gearbox transmission system using advanced vibration analysis algorithms
• Bearing and gearbox fault diagnostics under non-stationary operating condition
• Fatigue analysis of gears and bearings
• Artificial Intelligence-based bearing and gearbox fault diagnostics and prognostics
• Motor fault diagnosis and prognostics
• Shaft fault diagnostics and prognostics