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TECHNICAL PAPERS

Modeling and Identification of a Nonlinear SDOF Moored Structure, Part 1—Hydrodynamic Models and Algorithms

[+] Author and Article Information
S. Narayanan

Skillings-Connolly, Inc., 5016 Lacey Boulevard S.E., Lacey, WA 98503 USAe-mail: chithra@skillings.com

S. C. S. Yim

Department of Civil Engineering, Oregon State University, Corvallis, OR 97331 USAe-mail: solomon.yim@oregonstate.edu

J. Offshore Mech. Arct. Eng 126(2), 175-182 (May 18, 2004) (8 pages) doi:10.1115/1.1710875 History: Received July 09, 2002; Revised September 27, 2003; Online May 18, 2004
Copyright © 2004 by ASME
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References

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Bernitsas,  M. M., and Chung,  J. S., 1990, “Nonlinear Stability and Simulation of Two-Line Step Lowering and Mooring,” Applied Ocean Research, 11, pp. 153–166.
Gottlieb, O., and Yim, S. C. S., 1993, “Drag Induced Instabilities and Chaos in Mooring Systems,” International Journal of Ocean Engineering, 29 (6), pp. 569–599.
Thompson, J. M. T., and Stewart, H. B., 1986, Nonlinear Dynamics and Chaos, John Wiley & Sons, Ltd, New York.
Lin,  H., and Yim,  S. C. S., 1997, “Noisy Nonlinear Motions of a Moored System, Part I: Analysis and Simulations,” J. Waterw., Port, Coastal Ocean Div., Am. Soc. Civ. Eng., 123(5), pp. 287–295.
Lin,  H., and Yim,  S. C. S., 1996, “Analysis of a Nonlinear System Exhibiting Chaotic, Noisy Chaotic and Random Behaviors,” ASME J. Appl. Mech., 63(2), pp. 509–516.
Isaacson, M., and Phadke, A., 1994, “Chaotic Motion of a Nonlinearity Moored Structure,” Proceedings of the 4th International Offshore and Polar Engineering Conference Vol. III, pp. 338–345.
Lin,  H., and Yim,  S. C. S., 1998, “Experimental Calibration of Bifurcation Superstructure of Nonlinear System,” J. Eng. Mech. Div., 124(4), pp. 471–475.
Bendat, J. S., and Piersol, A. G., 1993, Engineering Applications of Correlation and Spectral Analysis, John Wiley & Sons, Inc., New York.
Bendat,  J. S., Palo,  P. A., and Coppolino,  R. N., 1992, “A General Identification Technique for Nonlinear Differential Equations of Motion,” Probab. Eng. Mech., 7, pp. 43–61.
Yim, S. C. S., Myrum, M. A., Gottlieb, O., Lin, H., and Shih, I.-M., 1993, Summary and Preliminary Analysis of Nonlinear Oscillations in a Submerged Mooring System Experiment, Oregon State University, Ocean Engineering Report No. OE-93-03.
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Laya,  E. J., Connor,  J. J., and Shyam,  S. Sundar, 1997, “Hydrodynamic Forces on Flexible Offshore Structures,” J. Eng. Mech., 123, pp. 433–488.
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Figures

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SDOF experimental set up: a) plan, b) profile view
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Comparison between the geometric model and approximate restoring force functions: a) force, b) relative error
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Schematic diagram of the SDOF system: a) system diagram for the calculation of wave velocity and acceleration, b) RV model, c) IFF model
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The nonlinear-structure linearly damped (NSLD) algorithm: a) with feedback, b) without feedback
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The nonlinear-structure coupled hydrodynamically damped (NSCHD) algorithm: a) with feedback, b) without feedback
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The nonlinear-structure nonlinearly-damped (NSND) algorithm a) with feedback b) without feedback

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