scholarly journals Influence of variable acceleration on parametric roll motion of a container ship

2016 ◽  
Vol 4 (3) ◽  
pp. 205-214
Author(s):  
Emre Peşman
Keyword(s):  
Roll Motion ◽  
Container Ship ◽  
Parametric Roll

Parametric Rolling in Regular Head Waves of the KRISO Container Ship: Numerical and Experimental Investigation in Shallow Water

2019 ◽  
Author(s):  
Manases Tello Ruiz ◽  
Jose Villagomez ◽  
Guillaume Delefortrie ◽  
Evert Lataire ◽  
Marc Vantorre
Keyword(s):  
Shallow Water ◽  
Water Depth ◽  
Water Waves ◽  
Failure Modes ◽  
Container Ship ◽  
Parametric Roll ◽  
Parametric Rolling ◽  
Wave Characteristics ◽  
Intact Stability ◽  
Head Waves

Abstract The IMO Intact Stability Code considers the parametric rolling phenomenon as one of the stability failure modes because of the larger roll angles attained. This hazardous condition of roll resonance can lead to loss of cargo, passenger discomfort, and even (in the extreme cases) the ship’s capsize. Studies as such are mostly conducted considering wave characteristics corresponding to wave lengths around one ship length (λ ≈ LPP) and wave amplitudes varying from moderate to rough values. These wave characteristics, recognised as main contributors to parametric rolling, are frequently encountered in deep water. Waves with lengths of such magnitudes are also met by modern container ships in areas in close proximity to ports, but with less significant wave amplitudes. In such areas, due to the limited water depth and the relatively large draft of the ships, shallow water effects influence the overall ship behaviour as well. Studies dedicated to parametric rolling occurrence in shallow water are scarce in literature. In spite of no accidents being yet reported in such scenarios, its occurrence and methods for its prediction require further attention; this in order to prevent any hazardous conditions. The present work investigates the parametric roll phenomenon numerically and experimentally in shallow water. The study is carried out with the KRISO container ship (KCS) hull. The numerical investigation uses methods available in literature to study the susceptibility and severity of parametric rolling. Their applicability to investigate this phenomenon in shallow water is also discussed. The experimental analysis was carried out at the Towing Tank for Manoeuvres in Confined Water at Flanders Hydraulics Research (in co-operation with Ghent University). Model tests comprised a variation of different forward speeds, wave amplitudes and wave lengths (around one LPP). The water depth was fixed to a condition equivalent to a gross under keel clearance (UKC) of 100% of the ship’s draft.

Numerical Analysis of Added Resistance on Ship in Parametric Roll Motions

2016 ◽  
Author(s):  
Jae-Hoon Lee ◽  
Yonghwan Kim ◽  
Min-Guk Seo
Keyword(s):  
Near Field ◽  
Three Dimensional ◽  
Field Method ◽  
Roll Motion ◽  
Added Resistance ◽  
Regular Waves ◽  
Nonlinear Formulation ◽  
Parametric Roll ◽  
Weakly Nonlinear ◽  
Rankine Panel Method

In the present study, the added resistance of a containership in parametric roll motion is investigated. The numerical simulation is carried out using a three dimensional Rankine panel method along with the weakly nonlinear formulation. The added resistance is evaluated by a near-field method, namely, the direct integration of the 2nd-order pressure on a body surface. To calculate the component resulting from the large-amplitude roll motion, the higher-order restoring and Froude-Krylov forces on wetted hull surfaces are taken into account. With or without parametric roll in regular waves, the components of added resistance classified with respect to integral terms are compared to figure out the important of each term. Through the investigation, the correlation between the added resistance and parametric roll is derived from coupling and decoupling the components of roll motion and vertical motions.

scholarly journals Nonlinear Container Ship Model for the Study of Parametric Roll Resonance

2007 ◽  
Vol 28 (4) ◽  
pp. 87-103 ◽  
Author(s):  
Christian Holden ◽  
Roberto Galeazzi ◽  
Claudio Rodríguez ◽  
Tristan Perez ◽  
Thor Inge Fossen ◽  
...  
Keyword(s):  
Container Ship ◽  
Parametric Roll ◽  
Ship Model ◽  
Parametric Roll Resonance

Study on added resistance of a ship under parametric roll motion

2017 ◽  
Vol 144 ◽  
pp. 1-13 ◽  
Author(s):  
Jae-Hoon Lee ◽  
Yonghwan Kim
Keyword(s):  
Roll Motion ◽  
Added Resistance ◽  
Parametric Roll

scholarly journals Numerical and Analytical Approaches for Roll Motion Analysis in Regular Longitudinal Waves

2015 ◽  
Vol 22 (3) ◽  
pp. 28-35
Author(s):  
Emre Peşman ◽  
Deniz Can Kolukısa ◽  
Metin Taylan
Keyword(s):  
Motion Analysis ◽  
Degrees Of Freedom ◽  
Three Dimensional ◽  
Roll Motion ◽  
Diffraction Radiation ◽  
Parametric Roll ◽  
Stability And Bifurcations ◽  
Flow Theories ◽  
Analytical Approaches ◽  
Numerical Approaches

Abstract In this study numerical and analytical approaches were investigated in terms of accuracy of their results, practicality of solution and ability to reproduce the main features of the parametric roll phenomenon such as loss of stability and bifurcations in parametric roll motion analysis of ships. In general, single-degree-of-freedom analytical approach is based on reducing number of degrees of freedom from 3 to 1 by using the quasi-static Froude-Krylov assumption, incorporating heave and pitch effects by means of a time varying restoring moment. On the other hand, numerical approaches to motion of six and four degrees of freedom are based on three dimensional diffraction/radiation and potential flow theories. In summary, this paper reveals that analytical approaches are sufficiently adequate to obtain accurate practical results for this relatively complex phenomenon.

scholarly journals Robust model predictive control employed to the container ship roll motion using fin-stabilizer

2016 ◽  
Vol 3 (1) ◽  
pp. 1235478
Author(s):  
Hamid Malekizade ◽  
Mohammad Reza Jahed-Motlagh ◽  
Bijan Moaveni ◽  
Ali Moarefianpour ◽  
Hassan Ghassemi
Keyword(s):  
Model Predictive Control ◽  
Predictive Control ◽  
Roll Motion ◽  
Container Ship ◽  
Robust Model Predictive Control ◽  
Robust Model ◽  
Ship Roll ◽  
Fin Stabilizer ◽  
Ship Roll Motion

SVR-Based Parametric Identification for Parametric Roll Resonance of Ships in Longitudinal Regular Waves

2016 ◽  
Author(s):  
Xian-Rui Hou ◽  
Zao-Jian Zou
Keyword(s):  
Mathematical Model ◽  
Parametric Identification ◽  
Support Vector ◽  
Nonlinear Phenomenon ◽  
Container Ship ◽  
Regular Waves ◽  
Nonlinear Mathematical Model ◽  
Parametric Roll ◽  
Parametric Roll Resonance ◽  
The Mathematical Model

Parametric roll resonance, as a nonlinear phenomenon related to ship stability, is particularly apt to happen when a ship is sailing in longitudinal waves. It can generate sudden oscillation with large amplitude up to 30–40 degrees of roll and put the ship and crew in danger. To predict the parametric roll resonance of ships, a suitable model for describing this phenomenon is needed. In this paper, a nonlinear mathematical model considering the strong nonlinear coupling among the heave, roll, and pitch motions of ships is established, and support vector regression (SVR) is applied to identify the unknown damping and restoring coefficients in the mathematical model. To verify the accuracy and validity of SVR in parametric identification, a container ship is considered, and the coupled heave, roll, and pitch motions of the ship in longitudinal regular waves are simulated. Based on the simulated responses, the unknown coefficients in the mathematical model are identified by SVR. Then the coupled heave-roll-pitch motion of the container ship in regular waves is predicted by using the identified coefficients in comparison with the simulated data, and satisfactory agreement is achieved. From this study, it is concluded that SVR can be applied to identify the unknown coefficients in the nonlinear mathematical model for predicting the parametric roll resonance of ships in longitudinal regular waves.

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