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Technical Briefs

Combined Steady State and Transient Analysis of a Patrol Vessel as Affected by Varying Amounts of Damping and Periodic and Random Wave Excitation

[+] Author and Article Information
Jeffrey M. Falzarano

 Texas A&M University, Ocean Engineering CE/TTI Tower, Room 801D, College Station, TX 77843

Srinivas Vishnubhotla, Sarah E. Juckett

 University of New Orleans, New Orleans, LA 70148

J. Offshore Mech. Arct. Eng 132(1), 014501 (Dec 21, 2009) (4 pages) doi:10.1115/1.4000390 History: Received February 23, 2007; Revised January 18, 2009; Published December 21, 2009; Online December 21, 2009

In this paper various techniques of dynamical system analysis are used to analyze the effect of damping on large amplitude nonlinear ship-rolling motion of a patrol vessel. In particular steady state magnification curves, Poincare maps are for harmonic forcing and project phase planes are for random forcing. It has been found that varying amounts of damping substantially affect the vessel’s critical behavior. This is important since most stability regulations ignore damping and solely concentrate on the vessel’s righting ram curve. Moreover roll damping is difficult to predict accurately and small changes in damping may have a significant effect.

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Figures

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Figure 2

Ship righting arm curve and various order polynomial approximations

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Figure 3

(a) Steady state magnification curves for a patrol vessel with rudders 0 deg astern, wave heights are 1.2 m, 1.8 m, 2.4 m, and 3 m; and (b) steady state magnification curves for a patrol vessel with rudders 90 deg astern, wave heights are 1.2 m, 1.8 m, 2.4 m, and 3 m

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Figure 5

Time history of scaled wave exciting force

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Figure 6

(a) Patrol vessel projected phase plane for the P–M spectra, sea state 5, rudders 0 deg astern; and (b) patrol vessel projected phase plane for the P–M spectra, sea state 5, rudders 90 deg astern

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Figure 4

(a) Poincare map for a patrol vessel with rudders 0 deg astern and (b) Poincare map for a patrol vessel with rudders 90 deg astern

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Figure 1

Prediction of ship-roll damping from model sallying experiments

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