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Wednesday, July 10 • 10:30 - 13:00
RESEARCH ON THE EFFECT OF AFT-STERN BEARING OBLIQUELY BORING ON BEARING PERFORMANCE AND SHAFTING TRANSVERSE VIBRATION

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As an important part of Marine power plant, the reliability of propulsion shaft system has an important impact on the stable operation of the whole ship. Unreasonable alignment of the shaft system may result in unilateral load of the stern bearing, reduce the bearing capacity, or even lead to bearing damage in serious cases. The change of bearing state will reduce the nat-ural frequency of lateral vibration of the whole shafting system and even make it fall into the common running speed zone, which will seriously affect the reliability of the propulsion sys-tem and the safety and comfort of ships. For large ships, reasonable alignment method is common used for shafting alignment installation at present. The existence of Angle between bearings and shaft journal may reduce the bearing capacity, leading to bearing wear and the decrease of natural frequency of the system. This paper using Finite element analysis method combined with MATLAB, analysed the stern bearing performance and the transverse vibra-tion performance of a ship propulsion shafting which installed by the reasonable alignment method. Established the relationship model between shaft segment and bearing when boring is adopted. The bearing characteristic parameters such as bearing oil film thickness, bearing stiffness and the equivalent fulcrum position of Aft-stern bearing force under different condi-tions were calculated. And then the influence of boring and rotation speed on transverse vi-bration characteristics of shafting is analysed. The results show that the boring process on stern bearing has a beneficial effect on improving bearing performance. And the boring pro-cess and increase of rotation speed will decrease the transverse vibration frequency of the shaft system, it should be paid attention during shafting design.


Wednesday July 10, 2019 10:30 - 13:00 EDT
St-Laurent 3, Board 10-A
  T07 Struct. dyn. & nonlin. vib., RS04 Rotordynamics