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Alignment of Direct-Coupled Large 2-Stroke Marine Propulsion Engines

Market demands and development trends of the past 10 years have lead to an increase of the ship hull bending and simultaneously lowered the flexibility of the propulsion shafts. Optimum large bearing distances and pre-compensation of influences affecting alignment need to be considered for the alignment layout of the propulsion shaft line. Calculations using advanced 3D FE based crankshaft models with elastic bearings and clearance are utilised to evaluate alignment measurement result.