Careful alignment of the shaft line is crucial for a ship's propulsion system because it ensures the efficient, reliable, and safe transmission of power from the engine to the propeller. The shaft line, which consists of the main engine, gearbox, intermediate shafts, propeller shaft, and propeller, must have its rotational axes precisely co-linear and concentric within engineering tolerances. Any deviation from this ideal alignment introduces significant problems throughout the entire propulsion train. Misalignment creates excessive vibration, which can cause discomfort for crew and passengers, and propagate damaging forces to other ship systems and equipment. Bearings, such as main engine bearings, gearbox bearings, plummer block bearings, and stern tube bearings, are designed ....
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