Parameter Identification of Nonlinear Ocean Mooring Systems Using the Hilbert Transform

[+] Author and Article Information
O. Gottlieb, M. Feldman

Faculty of Mechanical Engineering, Technion—lsrael Institute of Technology, Haifa 32000, Israel

S. C. S. Yim

Ocean Engineering Program, Department of Civil Engineering, Oregon State University, Corvallis, OR 97331

J. Offshore Mech. Arct. Eng 118(1), 29-36 (Feb 01, 1996) (8 pages) doi:10.1115/1.2828798 History: Received January 03, 1995; Revised November 29, 1995; Online December 17, 2007


We introduce and demonstrate the applicability of a parameter identification algorithm based on the Hilbert transform to nonlinear ocean mooring systems. The mooring dynamical system consists of a submerged small body and includes a geometrically nonlinear restoring force and a nonlinear dissipation function incorporating both viscous and structural damping. By combining a recently developed methodology with a generalized averaging procedure, parameter estimation from the slowly varying envelope dynamics is enabled. System backbone curves obtained from data generated by numerical simulation are compared to those obtained analytically and are found to be accurate. An example large-scale experiment is also considered.

Copyright © 1996 by The American Society of Mechanical Engineers
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