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TECHNICAL PAPERS

MOB Platform Nonlinear Dynamics in a Realistic (Random) Seaway

[+] Author and Article Information
S. Vishnubhotla, J. Falzarano

School of Naval Architecture, University of New Orleans, New Orleans, LA 70148

A. Vakakis

Mechanical Engineering Department, University of Illinois (U-C), Urbana, IL

J. Offshore Mech. Arct. Eng 124(1), 48-52 (May 29, 2001) (5 pages) doi:10.1115/1.1425396 History: Received July 05, 2000; Revised May 29, 2001
Copyright © 2002 by ASME
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References

Figures

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(a) MOB roll moment excitation spectra for NATO sea—state 6, {Hs,T0}={16.4 ft, 12.4 s}; (b) MOB corresponding roll moment excitation time history (nondim) for NATO sea state 6
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MOB roll moment excitation spectra for NATO sea state—9, {Hs,T0}={45.9 ft, 20.0 s}
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MOB Projected Phase Plane for NATO sea state 8—(a) {Hs,T0}={37.7 ft, 16.4 s} without δGM(t); (b) {Hs,T0}={37.7 ft, 16.4 s} with δGM(t)
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MOB Projected Phase Plane for NATO sea state 6—(a) {Hs,T0}={16.4 ft, 12.4 s} without δGM(t); (b) {Hs,T0}={16.4 ft,12.4 s} with δGM(t)
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MOB projected phase plane for NATO sea state 9—(a) {Hs,T0}={45.9 ft, 20.0 s} without δGM(t); (b) {Hs,T0}={45.9 ft,20.0 s} with δGM(t)
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MOB projected phase plane for NATO sea state 9 with λ=10, η=1.0
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MOB projected phase plane for NATO sea state 9 with λ=1.0, η=0.1
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MOB projected phase plane for NATO sea state 9 with λ=10, η=0.1
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MOB projected phase plane for NATO sea state 9 with λ=10, η=0.01
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Extended phase space showing solutions contained in upper stable, W+s(t) and lower unstable manifold W−us(t), sea state 9 (roll and roll velocity versus time are plotted)
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Extended phase space showing solutions contained in upper unstable, W+us(t) and lower stable manifold W−s(t), sea state 9 (roll and roll velocity versus time are plotted)
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MOB roll moment excitation transfer function (RAO)

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