Advanced Calculation Method for Marine Propulsion Shafting Alignment

概要

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Recently, there have been increasing reports of damage to the aft side main bearings of two-stroke main diesel engines on large ships such as VLCCs that are considered to be caused by misalignment. The misalignments are generally thought to be brought about by increasing deformation of the engine room floor due to changes in draft. On the other hand, the increasing rigidity of propulsion shafts due to larger output and slower revolutionary speed, which have made the shafts less accommodating to any small changes in bearing heights, is also thought to contribute to such damage. Until recently, most instances of damage related to shaft alignment have occurred in the stern-tube bearing. Therefore, shafting alignment calculations have traditionally been aimed at reducing stern tube bearing pressure while damage to the main bearings was not well understood. Thus, it is necessary to establish an advanced calculation method for alignment that includes the main bearings.
財団法人日本海事協会の論文