The effects of slowly varying wave drift forces on the nonlinear dynamics of mooring systems have been studied extensively in the past 30 years. It has been concluded that slowly varying wave drift may resonate with mooring system natural frequencies. In recent work, we have shown that this resonance phenomenon is only one of several possible nonlinear dynamic responses of mooring systems to slowly varying wave drift excitation. We were able to reveal new phenomena based on the design methodology developed at the University of Michigan for autonomous mooring systems and treating slowly varying drift as an external time-varying force. In this paper, the U of M methodology is used systematically to reveal seven phenomena induced by mean and slowly varying drift forces; one of those is resonance. Conceptually, numerous qualitatively different behaviors may be induced. The next step toward the comprehensive identification of such phenomena is taken by introducing the method of harmonic balance to study nonautonomous mooring systems.
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e-mail: michaelb@engin.umich.edu
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November 2004
Technical Papers
Mooring Dynamics Phenomena Due to Slowly-Varying Wave Drift
Michael M. Bernitsas, Ph.D., Professor, ASME Fellow,
e-mail: michaelb@engin.umich.edu
Michael M. Bernitsas, Ph.D., Professor, ASME Fellow
Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145
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Joa˜o Paulo J. Matsuura, Graduate Student, Research Assistant,
e-mail: matsuura@engin.umich.edu
Joa˜o Paulo J. Matsuura, Graduate Student, Research Assistant
Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145
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Torgrim Andersen, Visiting Scholar
e-mail: tan@apl.no
Torgrim Andersen, Visiting Scholar
Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145
Search for other works by this author on:
Michael M. Bernitsas, Ph.D., Professor, ASME Fellow
Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145
e-mail: michaelb@engin.umich.edu
Joa˜o Paulo J. Matsuura, Graduate Student, Research Assistant
Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145
e-mail: matsuura@engin.umich.edu
Torgrim Andersen, Visiting Scholar
Department of Naval Architecture and Marine Engineering, The University of Michigan, 2600 Draper Road, Ann Arbor, MI, 48109-2145
e-mail: tan@apl.no
Contributed by the OOAE Division for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received February 2002; final revision, February 2004. Associate Editor: S. Yim.
J. Offshore Mech. Arct. Eng. Nov 2004, 126(4): 280-286 (7 pages)
Published Online: March 7, 2005
Article history
Received:
February 1, 2002
Revised:
February 1, 2004
Online:
March 7, 2005
Citation
Bernitsas, M. M., Matsuura, J. P. J., and Andersen, T. (March 7, 2005). "Mooring Dynamics Phenomena Due to Slowly-Varying Wave Drift ." ASME. J. Offshore Mech. Arct. Eng. November 2004; 126(4): 280–286. https://doi.org/10.1115/1.1834620
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