Changes in Propeller Shaft Behavior by Fluctuating Propeller Forces during Ship Turning
Source abstract
Abstract
It is known that a ship’s shafting system can be adversely affected by hull deformation, variations in the engine power, the propeller load, and eccentric propeller thrusts, thereby increasingly affecting the behavior of the shaft’s movement. A deformed shafting system may also lead to a potential risk of bearing damage by causing a change in the local load of the rear part of the after-stern tube bearing of the propeller shaft. With this concern, a series of previous studies were focused on optimizing the effects of hull deformation by securing a proper level of propulsion shaft stability and optimizing the relative inclination angle and oil film retention based on a quasi-static state, that is, Rules for the Classification of Steel Ships and experiences of shipyards. However, despite our efforts to resolve this issue, marine accidents involving stern tube bearing damage have continued to occur under relatively unattended ship motions in a transient state, that is, a quasi-static state that can possibly cause sudden stern flow field changes. Therefore, to improve the stability of the propulsion shaft, it is necessary to understand ship motions and the conditions of shafting systems in a dynamic state and a transient state when the system is designed. From this point of view, this study investigated the effect of changes in eccentric propeller forces on the motion of the propeller shaft in a representative transient state of a 50,000 deadweight tonnage tanker by means of the strain gauge method and a displacement sensor. The research findings demonstrate that propeller thrust fluctuations have a direct effect on the shaft stability by significant changes in the shaft motion that can lead to unbalanced supporting loads on the stern tube bearing. These results clearly reproduce the cause of damage to the ship in which the accident occurred at a reliable level and will be a reference for establishing pragmatic guidelines for preventing damage to similar ships in the future.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Mechanical Failure Analysis and Simulation · Engineering Structural Analysis Methods · Tribology and Lubrication Engineering
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Division of Marine System Engineering, Korea Maritime and Ocean University, Busan 49112, Korea
Department of Naval Architecture, Ocean and Marine Engineering, University of Strathclyde, 100 Montrose Street, Glasgow G4 0LZ, UK
Funding
National Research Foundation of Korea (NRF) · Development of Autonomous Ship Technology
References (43)
Show source-provided references
1. A quarter century of propulsion shafting design practice and operating experience in the US navy
2. Considerations in the design of marine propulsion shaft systems
3. Design of propulsion shaft systems using fair curve alignment theory10.1111/j.1559-3584.1964.tb04091.x ↗
4. Analysis of shafting problems using fair curve alignment theory10.1111/j.1559-3584.1965.tb05656.x ↗
5. Shipyard alignment of propulsion shafting using fair curve alignment theory10.1111/j.1559-3584.1965.tb04996.x ↗
6. Optimum alignment of marine engine shaftings by the finite element method
7. A study on the propulsion shaft alignment calculation by the matrix method of three-moment theory
8. Alignment Calculation of Marine Engine Shafting System by Quadruple Integration Method
9. Some considerations of marine shafting design10.1108/eb053234 ↗
10. Class NK (2006). Guidelines on Shafting Alignmen, Class NK.
11. MAN Energy Solutions (2014). Final Alignment of Engine on Board, MAN Energy Solutions.
12. MAN Energy Solutions (2012). Bearing Load Measurement by Jacking Up, MAN Energy Solutions.
13. Pressure Distribution Analysis for After Bush Bearing of Ship Propulsion Shaft10.3744/SNAK.2004.41.3.035 ↗
14. Development of elastic shaft alignment design program10.3744/SNAK.2006.43.4.512 ↗
15. Kozousek, V., and Davies, P. (2000). Analysis and Survey Procedures of Propulsion Systems: Shaft Alignment, Lloyd’s Register’s Technical Association.
16. DNV (2021). DNVGL-RU-SHIP Pt. 4, Ch. 2, Sec. 4, 2.1.6 Aft Most Bearing Lubrication Criteria, DNV.
17. Study on shaft alignment of propulsion shafting system depending on single reaction force supporting position of aft stern tube bearing10.1007/s00773-021-00803-3 ↗
18. Bureau Veritas (2015). Elastic Shaft Alignment(ESA). Sec 2. 5. Running Calculations, Bureau Veritas.
19. A Study on the Stern Bearing Damage and Shaft Alignment for 37K DWT Product/Chemical Tanker10.3744/SNAK.2021.58.2.097 ↗
20. Dynamic alignment taking account of propeller forces and stern tube bearing performances10.5988/jime1966.18.142 ↗
21. Reliability improvement of stern tube bearing considering propeller shaft forces during ship turning
22. Sugimoto, I., Baba, S., Yatsuo, M., and Tanaka, H. (2001, January 7–10). Development of the criteria for crankshaft alignment in large 2-stroke marine diesel engines. Proceedings of the Conference Publication of 23rd CIMAC World Congress on Combustion Engine Technology for Ship Propulsion, Power Generation, Rail Traction, Hamburg, Germany.
23. Dubbioso, G. Experimental investigation of blade and propeller loads: Steady turning motion10.1016/j.apor.2019.101874 ↗
24. Vartdal, B.J., Gjestland, T., and Arvidsen, T.I. (2009, January 22–24). Lateral propeller forces and their effects on shaft bearings. Proceedings of the First International Symposium on Marine Propulsors, Trondheim, Norway.
25. Analysis of propeller bearing loads by CFD. Part I: Straight ahead and steady turning maneuvers10.1016/j.oceaneng.2016.12.004 ↗
26. Analysis of propeller bearing loads by CFD. Part II: Transient maneuvers10.1016/j.oceaneng.2017.09.050 ↗
27. Effects of Propeller Forces on the Propeller Shaft Bearing during Going Straight and Turning of Ship10.3744/SNAK.2015.52.1.61 ↗
28. Application of strain gauge method for investigating influence of ship shaft movement by hydrodynamic propeller forces on shaft alignment10.1016/j.measurement.2018.02.067 ↗
29. Choi, S.-P., Lee, J.-U., and Park, J.-B. (2021). Application of Deep Reinforcement Learning to Predict Shaft Deformation Considering Hull Deformation of Medium-Sized Oil/Chemical Tanker. J. Mar. Sci. Eng., 9.10.3390/jmse9070767 ↗
30. Study on oil film analysis of the stern tube bearing under the conditions of dynamic propeller shaft forces10.1299/kikaic.75.3054 ↗
31. Song, G., Park, H., and Lee, T. (2019). The Effect of Rudder Existence on Propeller Eccentric Force. J. Mar. Sci. Eng., 7.10.3390/jmse7120455 ↗
32. Comprehensive test system for ship-model resistance and propulsion performance in actual seas10.1016/j.oceaneng.2019.106915 ↗
33. In Service Diagnosing of a Marine Diesel Engine usion Mean Indicated Pressure
34. Wróblewski, P., and Iskra, A. (2020). Problems of Reducing Friction Losses of a Piston-Ring-Cylinder Configuration in a combustion Piston Engine with an Increased Isochoric Pressure Gain. SAE Technical Paper 2020-01-2227, Available online: https://saemobilus.sae.org/content/2020-01-2227/.10.4271/2020-01-2227 ↗
35. Shaft Alignment Using Strain Gages
36. ABS (2018). Guide for Enhanced Shaft Alignment, American Bureau of Shipping.
37. ABS (2019). Guidance Notes on Propulsion Shafting Alignment, American Bureau of Shipping.
38. A study of the analysis of shaft alignment considering hull deflections for 50,000 DWT oil/chemical tankers
39. Determining the influence of ship hull deformations caused by draught change on shaft alignment application using FE analysis10.1016/j.oceaneng.2020.107488 ↗
40. Research on shafting alignment considering ship hull deformations10.1016/j.marstruc.2010.01.003 ↗
41. Avgouleas, K., Sarris, E., and Gougoulidis, G. (2021, January 2–3). Practical Aspects of Propulsion Shaft Alignment. Proceedings of the SNAME 7th International Symposium on Ship Operations, Management and Economics, Athens, Greece.
42. A study on the analysis of bearing reaction forces and hull deflections affecting shaft alignment using strain gauges for a 50,000 DWT oil/chemical tanker
43. Theoretical and experimental analysis of the lateral vibration of shafting system using strain gauges in 50,000-DWT oil/chemical tankers