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TECHNICAL PAPERS

Modeling and Identification of a Nonlinear SDOF Moored Structure, Part 2—Comparisons and Sensitivity Study

[+] Author and Article Information
S.C.S. Yim

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

S. Narayanan

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

J. Offshore Mech. Arct. Eng 126(2), 183-190 (May 18, 2004) (8 pages) doi:10.1115/1.1710874 History: Received July 09, 2002; Revised September 27, 2003; Online May 18, 2004
Copyright © 2004 by ASME
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References

Narayanan,  S., and Yim,  S. C. S., 2004, “Modeling and Identification of a Nonlinear SDOF Moored Structure, Part 1–Hydrodynamic Models and Algorithms,” ASME J. Offshore Mech. Arct. Eng., 126(2), pp. 176–183.
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.
Wang,  C. Y., 1965, “The Flow Induced by an Oscillating sphere.” J. Sound Vib., 2(3), pp. 257–267.
Hjelmfelt,  A. T., Carney,  J. F., Lee,  S. L., and Mockros,  L. F., 1967, “Dynamic Response of a Restrained Sphere in a Fluid,” J. Eng. Mech. Div., 93, pp. 41–56.
Harleman, D. R. F., and Shapiro, W. C., 1958, “Investigations on the Dynamics of Moored Structures in Waves,” M. I. T. Hydrodynamics Lab. Tech. Rept. No. 28. Hjelmfelt,  A. T., , 1967, “Dynamic Response of a Restrained Sphere in a Fluid,” J. Eng. Mech. Div., 93, pp. 41–56.
Grace,  R. A., and Zee,  G. T. Y., 1978, “Further Tests on Ocean Wave Forces on Sphere,” J. Waterway Port Coastal and Ocean Div., 104, pp. 83–88.
Grace,  R. A., and Casiano,  F. M., 1969, “Ocean Wave Forces on a Sub Surface Sphere,” J. Waterways and Harbor Div., 95, pp. 291–312.
Gerald, G. F., and Wheatley, P. O., 1989. Applied Numerical Analysis, Addison-Wesley Publishing Company.
Laya,  E. J., Connor,  J. J., and Shyam Sundar,  S., 1984, “Hydrodynamic Forces on Flexible Offshore Structures,” J. Eng. Mech. Div., 123, pp. 433–488.

Figures

Grahic Jump Location
SDOF experimental low wave amplitude data: a) wave time series, b) wave spectra, c) response time series, d) response spectra
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SDOF experimental medium wave amplitude data: a) wave time series, b) wave spectra, c) response time series, d) response spectra
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SDOF experimental high wave amplitude data: a) wave time series, b) wave spectra, c) response time series, d) response spectra
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Comparison of identified responses using alternative algorithms with the experimental response a) SL b) SM c) SH
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Comparison of simulated response using IFF model with the experimental response: a) time series, b) spectra (Note: Captions will be modified–“NSND” will be changed to “IFF”)
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Effect of a1 on SDOF system behavior: a) (top) SL, b) (middle) SM, c) (bottom) SH
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Effect of a2 on SDOF system behavior: a) (top) SL, b) (middle) SM, c) (bottom) SH
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Effect of a3 on SDOF system behavior: a) (top) SL, b) (middle) SM, c) (bottom) SH
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Effect of ζ1 on SDOF system behavior: a) (top) SL, b) (middle) SM, c) (bottom) SH
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Effect of Cd1 on SDOF system behavior: a) (top) SL, b) (middle) SM, c) (bottom) SH
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Comparison of identified response using NSND model with the measured response by varying hydrodynamic coefficients: a) Cm,b) Cd

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