Method rolls for Simulating Roll Motions of Ships

Shigunov, Vladimir; Zorn, Tobias; Soukup, Peter

doi:10.1179/str.2013.60.2.003

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…However, since it is unusual to perform a motion study or model test, classification societies such as DNV issue a set of motion criteria that depend on the length and beam of the ship, the block coefficient, and its natural rolling period [9]. Therefore, the simulations of a ship's rolling motions in a seaway are necessary to predict the frequency of occurrence of excessive rolling angles or excessive transverse acceleration amplitudes [10]. In the literature, we can find much relevant research about mathematical models of nonlinear roll motion trying to predict this motion [11,12].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Ship’s Navigational Parameters to Improve the Stowage and Securing Criteria of Non-Standardized Cargo in Ships

Pérez-Canosa,

Orosa,

de Osés

et al. 2023

JMSE

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General cargo ships are the most numerous in the merchant fleet. In these vessels, the stowage and securing of non-standardized cargo must be designed prior to being shipped. Furthermore, during sea navigation, the shipmaster must be confident that the secured cargo is safe in any weather conditions. One of the goals of the present research is to provide helpful guides to ship operators about the optimal navigational parameters. Despite different criteria being followed by the shipping industry to calculate the rolling motion accelerations, relevant accidents and losses related to an inadequate securing arrangement still occur. Firstly, this paper analyzes and compares the IMO’s and classification societies’ criteria, obtaining relevant results about the different safety levels along the ship’s dimensions. Secondly, it obtains a novel mathematical model of angular transverse acceleration, considering the sea state conditions and navigational parameters. For this reason, it investigates the combinations of optimization of these parameters. Finally, it proposes novel 3D surface graphs as being easy, useful, and quick to be interpreted by shipmasters when sailing in certain sea state conditions, to know if the limits of the maximum securing arrangement are exceeded and predict the ship’s optimal speed and heading in order to set out.

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Section: Introductionmentioning

confidence: 99%

Optimization of Ship’s Navigational Parameters to Improve the Stowage and Securing Criteria of Non-Standardized Cargo in Ships

Pérez-Canosa,

Orosa,

de Osés

et al. 2023

JMSE

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“…The present model considers a crane, installed on a ship, made up of a double‐pendulum (hook‐payload) system and a trolley. This configuration allows to consider hook angles and payload angles in both in‐plane directions as well as the rolling (Kianejad et al., 2017; Soding et al., 2013) and pitching angle motions of the vessel. The system actuator (trolley) is allowed to move in‐plane like the hook‐payload system.…”

Section: Introductionmentioning

confidence: 99%

3D active dynamic actuation model for offshore cranes

Fantuzzi

Rustico

Formenti³

et al. 2021

Computer aided Civil Eng

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The handling of offshore payloads is a critical operation that presents numerous challenges, in particular related to the required precision in controlling their oscillations in a safe and accurate manner. The uncontrolled payload oscillations induced by the rolling movement of the vessel have been historically mitigated by the experience of on‐deck operators by means of taglines. The availability of experienced personnel is not always present, and a manual control operation still presents inconsistent performances and a high risk for the safety of men and machines. This study presents a novel approach to an antisway control conceived to mitigate such problems and possibly to automate some of the operations concerning the payload sway control that are currently done manually. In particular, a system consisting of a translating trolley actuated through a proportional–integral–derivative controller is taken into consideration to mitigate the oscillations induced by the vessel's rolling and pitching motion onto a three‐dimensional 8 degrees of freedom with double‐pendulum model representing the hanging payload. The study is completed through an analysis aimed to characterize the bandwidth and frequency response of the controlled closed‐loop system and highlight all the potential areas of interest for which further characterization is needed.

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“…Ship rolling can be controlled and evaluated thoroughly. (3)(4)(5)(6)(7)(8) Suppose that the origin of the coordinates in a ship is the center of gravity and the three perpendicular axes are the horizontal axis X, horizontal axis Y, and vertical axis Z. Then, the six DOFs of the ship motion are rolling, pitching, yawing, heaving, surging, and swaying, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%