RESEARCH PAPERS: Offshore Mechanics

Wave Loads and Motions of Long Structures in Directional Seas

[+] Author and Article Information
M. Isaacson, O. U. Nwogu

Department of Civil Engineering, The University of British Columbia, Vancouver, B.C., Canada

J. Offshore Mech. Arct. Eng 109(2), 126-132 (May 01, 1987) (7 pages) doi:10.1115/1.3257000 History: Received March 27, 1985; Revised May 07, 1986; Online October 30, 2009


The present paper deals with the effects of wave directionality on the loads and motions of long structures. A numerical procedure based on Green’s theorem is developed to compute the exciting forces and hydrodynamic coefficients due to the interaction of a regular oblique wave train with an infinitely long, semi-immersed floating cylinder of arbitrary shape. The linear transfer function approach is used to determine the wave loads and motions of a structure of finite length in short-crested seas. The effect of wave directionality is expressed as a frequency-dependent, directionally averaged reduction factor for the wave loads and a response ratio for the body motions. Numerical results are presented for the force reduction factor and response ratio of a long floating box subject to a directional wave spectrum with a cosine-power-type energy spreading function.

Copyright © 1987 by ASME
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