Wear And Friction Modelling On Lifeboat Launch
Slipway Panels
Author(s)
B. Thomas, M. Hadfield & S. Austen
Abstract
The Royal National Lifeboat Institution provides search and rescue cover along
the United Kingdom and Republic of Ireland coast using a variety of lifeboats
and launch techniques. In locations where there is no natural harbour it is
necessary to use an inclined slipway to launch the lifeboat into the sea. Slipway
stations consist of an initial section where the boat is held on rollers followed by
an inclined keelway lined with low friction composite materials, the lifeboat is
released from the top of the slipway and proceeds under its own weight into the
water. The lifeboat is subsequently recovered to the top of the slipway using a
winch line. With the introduction of the new, larger ‘Tamar’ class lifeboat it is
necessary to upgrade existing boathouses and standardise slipway operational
procedures to ensure consistent operation. The higher contact pressures and
launch velocities associated with the new lifeboat have led to issues of high
friction and wear on the low friction composite linings and a number of methods
have been adopted to mitigate this effect. This paper presents a methodology for
assessing slipway lining performance so that friction and wear conditions along
the slipway can be monitored to ensure consistent operation. A multidisciplinary
approach using tribometer testing in conjunction with finite element analysis and
real world slipway condition surveys is adopted to extend the scope of
investigation to incorporate common real world effects such as panel
misalignments. Various lubricants are assessed for their suitability with regard to
friction and wear performance in addition to sustainability considerations using
the methodology, and modifications to the design of slipway panels, guidelines
for lifeboat operation procedures and suitable panel installation tolerances are
developed. Finally, new slipway condition monitoring procedures are proposed
Keywords
lifeboats, tribology, wear, friction, slipway
Related Book
Other papers in this volume
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