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RESEARCH PAPERS: Ocean Engineering

Effect of Groove Shape on the Frictional Hold of a Sheave on Polyester Rope

[+] Author and Article Information
C. S. Albro

Battelle-Columbus, Columbus, Ohio 43201

F. Liu

Naval Civil Engineering Laboratory, Port Hueneme, Calif. 93043

J. Energy Resour. Technol 107(1), 103-106 (Mar 01, 1985) (4 pages) doi:10.1115/1.3231146 History: Received August 09, 1983; Revised October 14, 1983; Online October 22, 2009

Abstract

This paper discusses the effects of sheave groove shape, sheave diameter, and line tension on the frictional hold of polyester rope. A series of tests were conducted using five different sheaves, 5 and 9.2-cm-dia 2-in-1 polyester rope, under both wet and dry conditions. The frictional hold was determined from the difference in rope tension on opposite sides of a rotating sheave. The maximum tension on the high side was 245 kN. It was found that the coefficient of friction between polyester rope and smooth steel sheaves decreases with increase in rope tension for a given rope size. The 70-deg-V groove sheave shape demonstrated approximately 25 percent more frictional hold than the U-groove sheave shape. Holding capacity increases with sheave diameter. Large relative velocity exists between elastic lift line and sheave surface. Data will be used in a traction winch design.

Copyright © 1985 by ASME
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