Analysis of roll motion and stability of a fishing vessel in head seas

Neves, Marcelo A. S.; Pérez, Nelson Izquierdo; Lorca, Osvaldo M.

doi:10.1016/s0029-8018(02)00066-5

Cited by 18 publications

(2 citation statements)

References 3 publications

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“…Moreover, in the case of small vessels, as the ship speed increases, the acceleration increases not only because of the roll motion but also because of the pitch motion. This may impact bottom safety because of slamming, and the roll motion is considerably affected by the combined pitch-roll motion [14]. However, there are no accurate recommendations for the damping ratio required to predict pitch motion, and further research on this may be necessary.…”

Section: Introductionmentioning

confidence: 99%

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Nam

Park

et al. 2022

Water

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This study proposes a computational fluid dynamics (CFD)-modified potential (CMP) model. This hybrid model uses linear potential theory with a corrected damping ratio obtained from CFD simulations to analyze the seakeeping performance of a small vessel. According to the analysis procedure of the proposed model, a motion analysis, including the prediction of the roll and pitch damping ratio of a small barge, was conducted; to verify reliability; the results were compared to those of an experiment performed in a physical tank. The relative errors in the experiment for peak amplitude in the roll motion response amplitude operators (RAOs) using the CMP model were relatively small, whereas those obtained from only the potential analysis were large errors in all three conventionally used roll-damping ratios. In addition, the computational time consumed by the CMP model was longer than that consumed by the potential theory but faster than the full CFD simulation for all wave conditions. Subsequently, based on the motion analysis results, the seakeeping performance was evaluated in a real sea environment, and the results on the single significant amplitude (SSA) were discussed through comparison with the results of the potential analysis and experiment.

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Section: Introductionmentioning

confidence: 99%

CFD-Modified Potential Simulation on Seakeeping Performance of a Barge

Nam

Park

et al. 2022

Water

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“…Conducting experiments of capsizing of prismatic model ship, non-linearity in roll was studied by Cotton and Spyrou [22]. Santos Neves et al [23] investigated the parametric resonance of roll for a fishing vessel in head seas. Surendran and Reddy [24,25] studied the roll responses of a ship in beam seas in frequency domain and investigated the effect of different parameters on ship capsizing.…”

Section: Introductionmentioning

confidence: 99%

Mathematical model for coupled roll and yaw motions of a floating body in regular waves under resonant and non-resonant conditions

Das

2005

Applied Mathematical Modelling

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The prediction of resonance is very important with respect to the vessels stability in the early stages of design. In this paper, an efficient modeling approach is presented to determine coupled roll and yaw motions of a symmetric and slender floating body when the influences of small amplitude regular waves are dominant. The angular motions described in time domain by considering all internal and external forces are transformed into frequency domain to obtain motion characteristics. We adopt a semi-analytical treatment to obtain roll and yaw motions and derive system instability due to roll resonance. To compute hydrodynamic forces, we employ strip theory method where frequency dependent sectional added-mass, damping and restoring coefficients are derived from the FrankÕs close-fit curve. Numerical experiments carried out for a vessel of mass 19,190 ton under the action of wave of frequencies 0.56 and 0.76 rad/s with zero and non-zero initial conditions are reported and the effect of various parameters on system stability is investigated. Model results indicate that damping factor (1) plays a pivotal role when wave encountering frequency (x) and undamped natural frequency (b) are nearly equal. The essence of this study lies in the efficient modeling technique to evaluate damping factor and critical encountering frequency regime for a given ship particulars when experimentally derived resonance zone is absent.

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