Analysis of Motions of a Semisubmersible in Sea Waves

[+] Author and Article Information
F. Z. Sun

Marine Design and Research Institute of China, Shanghai, China

J. Energy Resour. Technol 104(1), 29-38 (Mar 01, 1982) (10 pages) doi:10.1115/1.3230376 History: Received May 03, 1980; Revised October 14, 1980; Online October 22, 2009


The forces acting on a three-dimensional cylinder with arbitrary symmetrical cross section are derived taking into account viscous effect and applying linear-processing techniques. Then general expressions for the hydrodynamic forces, motion equation and its solution for a semisubmersible platform in regular waves are obtained. Based on linear theory of statistical analysis, it is proposed to employ the concept of “equivalent wave height” for the calculation of transfer functions with which both the short-term and long-term distribution and statistical characteristics of the motion of a semisubmersible may be estimated. A computer program has been developed. Comparison between model experimental and theoretical data has shown satisfactory agreement.

Copyright © 1982 by ASME
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