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Nonlinear Model for Sub- and Superharmonic Motions of a MDOF Moored Structure, Part 2—Sensitivity Analysis and Comparison

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

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

S. Raman

 Skillings-Connolly, Inc., 5016 Lacey Boulevard S.E., Lacey, WA 98503

P. A. Palo

 Naval Facilities Engineering Service Center, 1100 23rd Avenue, Port Hueneme, CA 93043

J. Offshore Mech. Arct. Eng 127(4), 291-299 (Mar 24, 2005) (9 pages) doi:10.1115/1.2073187 History: Received September 26, 2004; Revised March 24, 2005

The nonlinear R-MI/SO system identification procedure and the parameters of the MDOF system identified in Part 1 are examined in detail in this paper. A parametric study is conducted and the results are presented on the sensitivity of the system parameters for two key nonlinear responses—subharmonic and superharmonic resonances. The parameters are compared to determine the appropriateness of using a single set of system parameters for both response regions. A detailed comparison of the MDOF and the corresponding SDOF system results is performed. The knowledge gained from the SDOF and MDOF studies on the applicability of the R-MISO technique for the system identification of MDOF submerged moored structures is discussed. The results show that the MDOF extension of the R-MI/SO nonlinear system identification technique works well; the resulting system parameters are relatively constant and can be applied to the both the sub- and superharmonic regions.

Copyright © 2005 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Effect of a1 on MDOF system behavior: (a) (first) MMH, (b) (second) MMS, (c) (third) MHH, (d) (fourth) MHS

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Figure 2

Effect of a2 on MDOF system behavior: (a) (first) MMH, (b) (second) MMS, (c) (third) MHH, (d) (fourth) MHS

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Figure 3

Effect of a3 on MDOF system behavior: (a) (first) MMH, (b) (second) MMS, (c) (third) MHH, (d) (fourth) MHS

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Figure 4

Effect of c12 on MDOF system behavior: (a) (first) MMH, (b) (second) MMS, (c) (third) MHH, (d) (fourth) MHS

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Figure 5

Effect of ζ1 on MDOF system behavior: (a) (first) MMH, (b) (second) MHH, (c) (third) MMS, (d) (fourth) MHS

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Figure 6

MDOF experimental data, MSP1: (a) (first) wave time series, (b) (second) wave spectra, (c) (third) response time series, (d) (fourth) response spectra

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Figure 7

Effect of a1 on MDOF system behavior (a) (first) MSP1H, (b) (second) MSP1S, (c) (third) MSP2H, (d) (fourth) MSP2S

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Figure 8

Effect of a2 on MDOF system behavior: (a) (first) MSP1H, (b) (second) MSP1S, (c) (third) MSP2H, (d) (fourth) MSP2S

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Figure 9

Effect of ζ1 on MDOF system behavior: (a) (first) MSP1H, (b) (second) MSP1S, (c) (third) MSP2H, (d) (fourth) MSP2S

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Figure 10

SDOF experimental setup: (a) plan; (b) profile view

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Figure 11

SDOF experimental low wave amplitude data: (a) wave time series, (b) wave spectra, (c) response time series, (d) response spectra

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Figure 12

SDOF experimental medium wave amplitude data: (a) wave time series, (b) wave spectra, (c) response time series, (d) response spectra

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Figure 13

SDOF experimental high wave amplitude data: (a) wave time series, (b) wave spectra, (c) response time series, (d) response spectra

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Figure 14

Comparison of MDOF and SDOF data: (a) (first) wave time series, (b) (second) wave spectra, (c) (third) surge time series, (d) (fourth) surge spectra

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Figure 15

Effect of Cm and Cd on Reynolds and Keulegan Carpenter numbers: (a) ReF, (b) KCF

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