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Keywords: bearing
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Proceedings Papers

Paper presented at the SNAME Propeller and Shafting Symposium, September 12–13, 2023
Paper Number: SNAME-PSS-2023-001
... This study investigates three different approaches for calculating alignment of a shaftline with water lubricated rubber bearings. The baseline model looks at a standard one dimensional (1D) analysis of a shaftline with rigid, knife-edge supports that is commonly used in the marine industry...
Proceedings Papers

Paper presented at the SNAME Propeller and Shafting Symposium, September 12–13, 2023
Paper Number: SNAME-PSS-2023-008
... The paper discusses the methodology for and performance improvements gained using the patent pending 100 Bond® Laser Babbitting Process developed by Wartsila Shaft Line Solutions. This process is currently being used at the Wartsila Iberica facility for commercial Line Shaft and Thrust Bearings...
Proceedings Papers

Paper presented at the SNAME Propeller and Shafting Symposium, September 12–13, 2023
Paper Number: SNAME-PSS-2023-002
... This paper examines the effect of dynamic propeller loads on the axial location of the knuckle point in a double sloped aft sterntube bearing (ASTB), as found in a typical marine slow-speed direct drive diesel engine powertrain. The so-called double sloped geometry is formed inside a bearing...
Proceedings Papers

Paper presented at the SNAME 15th Propeller and Shafting Symposium, September 25–26, 2018
Paper Number: SNAME-PSS-2018-08
... In recent years shafting systems, particularly those powered by slow-speed diesel engines, have been designed with only one bearing supporting the propeller shaft (typically an aft stern tube bearing). Designs with only one stern tube bearing provide for a system with more flexibility, easier...
Proceedings Papers

Paper presented at the SNAME 15th Propeller and Shafting Symposium, September 25–26, 2018
Paper Number: SNAME-PSS-2018-02
... With water lubricated shafts, the point of sealing the shaft needed to be positioned for access and that required a connecting tube to the sealing gland location. With oil lubricated bearings, a tube was required to contain the oil. As more ships are now being fitted with water lubricated...
Proceedings Papers

Paper presented at the SNAME 14th Propeller and Shafting Symposium, September 15–16, 2015
Paper Number: SNAME-PSS-2015-013
... propulsion equipment specification. This paper discusses the drivers, the solutions, current status and future predictions of these trends within the stern tube bearing and seal business. eal john thornhill bsc stern tube bearing installation lubricant propeller shaft requirement interface...
Proceedings Papers

Paper presented at the SNAME 14th Propeller and Shafting Symposium, September 15–16, 2015
Paper Number: SNAME-PSS-2015-002
... of the critical speeds i.e. free whirling vibration calculation. However, fatigue failure of the bracket and aft stern tube bearings, destruction of high-speed shafts with universal joints, noise and hull vibrations, generated by shafting, indicate the importance and inevitability of forced whirling vibration...
Proceedings Papers

Paper presented at the SNAME 14th Propeller and Shafting Symposium, September 15–16, 2015
Paper Number: SNAME-PSS-2015-014
... of several stern tube bearing failure cases, hereby trying to ensure a robust design for all kinds of operation. After investigation of the damages, a root cause analysis is possible. In particular, the investigations focus on review of the design of the shaft alignment and the correct performance...
Proceedings Papers

Paper presented at the SNAME 14th Propeller and Shafting Symposium, September 15–16, 2015
Paper Number: SNAME-PSS-2015-003
... Early propeller shafts operated in water lubricated lignum vitae bearings and used stuffing boxes as seals at hull penetrations. The bearings, however, required regular replacement, and the stuffing boxes not ideal as seals. Around 60 years ago, new seals were developed that allowed the use...
Proceedings Papers

Paper presented at the SNAME 14th Propeller and Shafting Symposium, September 15–16, 2015
Paper Number: SNAME-PSS-2015-012
... Stern tube lubricants; used to lubricate the bearings that support the vessel propeller shaft in the stern tube, are continuously lost to the marine environment while the ship is moving under power. Although the specific amount of lubricant lost in a stern tube application is dependent...
Proceedings Papers

Paper presented at the SNAME 13th Propeller and Shafting Symposium, September 11–12, 2012
Paper Number: SNAME-PSS-2012-008
... on a platform supply vessel. od shaft intermediate shaft inner ring amplitude subsea system fatigue failure speed range operation shaft upstream oil & gas shaft bearing fatigue strength stress concentration factor technical advisory marine transportation calculation stress amplitude...
Proceedings Papers

Paper presented at the SNAME 13th Propeller and Shafting Symposium, September 11–12, 2012
Paper Number: SNAME-PSS-2012-003
... PTFE (Poly-Tetra-Fluoro-Ethylene) is a well-known bearing material used to provide low friction for water-lubricated shafts. Partial arc design bearings are attracting keen interest due to reduce friction, since it develops a hydrodynamic film even in water lubrication. However, the application...
Proceedings Papers

Paper presented at the SNAME 13th Propeller and Shafting Symposium, September 11–12, 2012
Paper Number: SNAME-PSS-2012-001
... SKF Marine ISC was requested by STX Finland Oy, location Rauma to perform full scale dynamic propulsion shaft measurements on board of the RoPax vessel “Pride of France” in order to solve high shaft support bearing operational temperatures. After modeling the propulsion line with a state...
Proceedings Papers

Paper presented at the SNAME 12th Propeller and Shafting Symposium, September 15–16, 2009
Paper Number: SNAME-PSS-2009-10
... in chapter 4 from the same author. This time the broad experience and design philosophy of such complete shaft lines shall be described and explained by using various samples of several successful applications. steel shaft steel tube diesel engine bearing shaft line input shaft application cft...
Proceedings Papers

Paper presented at the SNAME 12th Propeller and Shafting Symposium, September 15–16, 2009
Paper Number: SNAME-PSS-2009-11
... shaft propulsion train vibration artificial intelligence calculation acceptance criteria calculation result propulsion reference line application maritime technology martin van leest alignment tolerance propulsion shaft calculation yuriy base model software bearing High-end Software...
Proceedings Papers

Paper presented at the SNAME 12th Propeller and Shafting Symposium, September 15–16, 2009
Paper Number: SNAME-PSS-2009-12
... This paper presents the results of an investigation into the theoretical and experimental performance of oil lubricated journal bearings. DNV has developed a new calculation tool for the analysis of journal bearing performance as part of shaft alignment analysis. The results of the calculation...
Proceedings Papers

Paper presented at the SNAME 12th Propeller and Shafting Symposium, September 15–16, 2009
Paper Number: SNAME-PSS-2009-14
... include shaft and propulsion coupling bolting as well as on anchoring and positioning bolting often required for most line shaft bearings, thrust bearings, and steering gears. Both a Finite Element Method (FEM) study and a shear test were recently performed to confirm superior load carrying ability...
Proceedings Papers

Paper presented at the SNAME 11th Propeller and Shafting Symposium, September 12–13, 2006
Paper Number: SNAME-PSS-2006-19
... Over fifty years ago, ship owners moved from open water lubricated stern tube bearings to oil-lubricated white metal bearings. Improvements in sealing technology encouraged this move. White metal bearings in a closed oil system offered a proven technology, which provided for predictable...
Proceedings Papers

Paper presented at the SNAME 11th Propeller and Shafting Symposium, September 12–13, 2006
Paper Number: SNAME-PSS-2006-18
... PTFE faced bearing technology, already established for hydro generator use, has been further developed for civil and military marine applications. The paper describes this type of bearing and the advantages compared with conventional babbitt. Details of testing and a description of a PTFE-faced...
Proceedings Papers

Paper presented at the SNAME 11th Propeller and Shafting Symposium, September 12–13, 2006
Paper Number: SNAME-PSS-2006-13
... 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...

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