000010637 001__ 10637
000010637 005__ 20240531171548.0
000010637 0247_ $$2doi$$a10.24868/10637
000010637 037__ $$aGENERAL
000010637 245__ $$aThrust block performance improvements using polymer lined tilting pads
000010637 269__ $$a2022-08-30
000010637 336__ $$aConference Proceedings
000010637 520__ $$aAt the beginning of the twentieth century, the introduction of A.G.M. Michell?s tilting pad bearing solution revolutionised naval thrust block design and performance. Even with today?s modern designs, the fundamental concept remains unchanged, a testament to the relative simplicity and reliability of his elegant solution. The tilting pad bearing solved the inherent limitations, problems and power losses associated with the preceding multi-collar fixed geometry designs.

One aspect of thrust block design that continues universally today is the use of tin-based whitemetal (Babbitt) as the lining material of choice for bearing tilting pads. While whitemetal has proven successful since its conception in 1839, its physical characteristics introduce limitations on naval thrust block design in terms of size and performance. In recent years, interest in, and research into, polymer lined tilting pad bearings has increased as opportunities for improved performance and efficiency continue to be sought. Polymers such as PTFE (polytetrafluoroethylene) and PEEK (Polyetheretherketone) have been shown to provide much improved specific load capability and reduced coefficients of friction compared to whitemetal.

This paper reviews the potential benefits of using polymer lined tilting pads in naval thrust block designs, providing reference to previous experimental work. A typical generic operating envelope and shaft diameter are then used to develop thrust block designs as a case study covering use of different pad lining materials.

By utilising the advantages of polymer lined tilting pads a significant improvement in bearing performance, propulsion system efficiency and signature reduction is shown resulting in reduced thrust block size, weight, power loss and breakout torque; improved minimum continuous speed capability and the lack of requirement for high pressure oil injection jacking systems.
000010637 542__ $$fCC-BY-NC-ND
000010637 6531_ $$aHydrodynamic bearings
000010637 6531_ $$aThrust bearings
000010637 6531_ $$aThrust blocks
000010637 6531_ $$aMarine propulsion
000010637 6531_ $$aPolymers
000010637 6531_ $$aPTFE
000010637 6531_ $$aPEEK
000010637 7001_ $$aButler, J$$uMichell Bearings
000010637 773__ $$tConference Proceedings of INEC
000010637 773__ $$jINEC 2022
000010637 85641 $$uhttps://www.imarest.org/events/category/categories/imarest-event/international-naval-engineering-conference-and-exhibition-2022$$yConference website
000010637 8564_ $$9f798bc0c-8911-444f-8a3b-9603b79746b7$$s2146633$$uhttps://library.imarest.org/record/10637/files/INEC_2022_paper_47%20%281%29.pdf
000010637 980__ $$aConference Proceedings