An Alternative Stochastic Representation of Drag Forces on Offshore Structures for Dynamic Analyses

[+] Author and Article Information
A. Naess, L. J. Ho̸egh Krohn

Department of Structural Engineering, Norwegian University of Science and Technology, N-7034 Trondheim, Norway

A. A. Pisano

Department of Structural Engineering, University of Pavia, I-27100 Pavia, Italy

J. Offshore Mech. Arct. Eng 119(3), 178-183 (Aug 01, 1997) (6 pages) doi:10.1115/1.2829065 History: Received July 01, 1996; Revised February 19, 1997; Online December 17, 2007


A new method for stochastic representation of the hydrodynamic drag forces on offshore structures subjected to irregular waves is described. For the case of zero current, it is shown that it is possible to construct a genuinly quadratic representation of the drag force that reproduces the statistical properties of the standard formulation of the drag force closely, and which has a spectral density that approximates the desired force spectrum reasonably well. The distinct advantage of this representation is that it brings dynamic analysis back into the frequency domain, in a similar manner as achieved for a linearized force representation.

Copyright © 1997 by The American Society of Mechanical Engineers
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