Wave Loads and Motions of Long Structures in Directional Seas

Author:

Isaacson M.1,Nwogu O. U.1

Affiliation:

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

Abstract

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.

Publisher

ASME International

Subject

Mechanical Engineering,Ocean Engineering

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