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.
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Wave Loads and Motions of Long Structures in Directional Seas
M. Isaacson,
M. Isaacson
Department of Civil Engineering, The University of British Columbia, Vancouver, B.C., Canada
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O. U. Nwogu
O. U. Nwogu
Department of Civil Engineering, The University of British Columbia, Vancouver, B.C., Canada
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M. Isaacson
Department of Civil Engineering, The University of British Columbia, Vancouver, B.C., Canada
O. U. Nwogu
Department of Civil Engineering, The University of British Columbia, Vancouver, B.C., Canada
J. Offshore Mech. Arct. Eng. May 1987, 109(2): 126-132 (7 pages)
Published Online: May 1, 1987
Article history
Received:
March 27, 1985
Revised:
May 7, 1986
Online:
October 30, 2009
Citation
Isaacson, M., and Nwogu, O. U. (May 1, 1987). "Wave Loads and Motions of Long Structures in Directional Seas." ASME. J. Offshore Mech. Arct. Eng. May 1987; 109(2): 126–132. https://doi.org/10.1115/1.3257000
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