Design evaluation of automatic bearing offset adjustment for marine propeller shaft
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View abstract on PubMed
Summary
This summary is machine-generated.This study introduces an automatic system to control marine propeller shaft alignment, improving bearing performance during partial propeller immersion. The innovative system actively adjusts intermediate bearing elevation, reducing shaft slope and preventing damage.
Area Of Science
- Marine Engineering
- Mechanical Systems
Background
- Conventional marine propeller shaft alignment methods may fail under dynamic sailing conditions like partial propeller immersion.
- Hull deformation, cavitation, and hydrodynamic forces can cause excessive shaft displacement, impacting stern tube bearings.
Purpose Of The Study
- To develop and demonstrate an automatic control system for marine propeller shaft alignment.
- To mitigate negative effects of shaft displacement on stern tube bearings during operation.
Main Methods
- An automatic bearing elevation adjustment system with a PID controller was implemented on a 50,000 DWT tanker model.
- Shaft displacement and slope data at the stern tube bearing were used for active control.
Main Results
- The system significantly improved shaft bending parameters under operational load conditions.
- Optimum intermediate bearing elevation was calculated at -0.076 mm, reducing shaft slope at the stern tube bearing to -0.3 mrad.
- In partial propeller immersion, shaft slope improved from 0.427 mrad to 0.294 mrad, staying below classification society limits.
Conclusions
- The automatic bearing elevation adjustment system is feasible and effective in improving marine propeller shaft alignment.
- The system enhances stern tube bearing protection by actively managing shaft displacement and slope.
- This technology offers a solution for maintaining shaft alignment under challenging operational scenarios.
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