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RESEARCH PAPERS: Offshore Mechanics

Model Study of the Wave-Driven Impact of Bergy Bits With a Semi-Submersible Platform

[+] Author and Article Information
J. H. Lever, L. Mak

Memorial University of Newfoundland, St. John’s, Newfoundland, Canada

B. Colbourne

Institute for Marine Dynamics, National Research Council of Canada, St. John’s, Newfoundland, Canada

J. Offshore Mech. Arct. Eng 112(4), 313-322 (Nov 01, 1990) (10 pages) doi:10.1115/1.2919872 History: Received August 04, 1989; Revised November 20, 1989

Abstract

This paper describes model bergy bit/semi-submersible impact tests conducted in the 58-m wave tank at Memorial University. The objective of the tests was to develop a method to accumulate statistics on the locations and velocities of wave-driven iceberg/structure impacts. We used a single irregular sea state and conducted 30 trials in each test series to accumulate the desired statistics. During each run, a camera system tracked the motions of both the bergy bit and the semi-submersible. We transferred this data and the geometry of both bodies to a CAD facility, which then recreated each test by redrawing the positions of the two bodies at each time step. In this manner, we determined the impact locations and times without the obstruction of the water surface, and computed automatically the desired impact velocities and kinetic energies. This paper describes the test and analysis techniques, and presents results for one test series. It also describes a new method to estimate impact kinetic energies using only open-water velocity data.

Copyright © 1990 by The American Society of Mechanical Engineers
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