Course stability of a ship towing system in wind

Fitriadhy, Ahmad; Yasukawa, Hironori; Koh, Kho King

doi:10.1016/j.oceaneng.2013.02.001

Cited by 39 publications

(20 citation statements)

References 7 publications

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“…x tug = V tow t + A tug cos ω tug t (9) As shown in the figure, the towed vessel exhibits more irregular slewing motion response, due to the tug motion disturbance. In particular, at high frequency condition (ω tug (L/g) 1/2 = 0.25), it can be observed that not only slewing motion amplitudes, but also oscillation periods, become more irregular.…”

Section: Effect Of Towline and Tug Motionmentioning

confidence: 94%

“…Yasukawa et al [6] presented simulation results based on the MMG (maneuvering modeling group) model, comparing them with model test data. Fitriadhy and Yasukawa [8] and Fitriadhy et al [9] presented towing stability results, considering the wind effects and numerical simulation results based on the MMG model. Fitriadhy and Yasukawa [10] proposed a numerical model for the course stability of a towed ship, that is coupled to a tow ship through a towline.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Investigation on Nonlinear Dynamic Responses of a Towed Vessel in Calm Water

Nam

2020

JMSE

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In this study, we numerically investigated the nonlinear dynamic responses of an autonomous towing system where a vessel is passively towed by a tug via a towline. A three-degrees-of-freedom maneuvering mathematical model is utilized to describe the nonlinear dynamics of the towed vessel in calm sea. The hydrodynamic force acting on the towed vessel is modelled as a modular-type hull force model, which includes linear and nonlinear (third order) damping forces in sway and yawing directions. The towline force is simply modeled as a linear spring. First, the motion responses of a towing system, showing large sway-yaw coupled motions due to unstable towing characteristics, are studied by applying phase plane analysis. For the validation of the present numerical method, the simulation results are directly compared with the model test data. Then, simulation parameters, such as towing speed, initial positions and hull force coefficients, are changed and their resulting limit cycles are investigated. Finally, the effects of towline and tug motion are discussed based on the simulation results. It is found that the dynamic characteristics of the towed vessel come closer to being chaotic due to the nonlinear stiffness effect of the towline and tug motion effect.

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Section: Effect Of Towline and Tug Motionmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Numerical Investigation on Nonlinear Dynamic Responses of a Towed Vessel in Calm Water

Nam

2020

JMSE

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“…However, it is common to refloat a sunken vessel firstly and tow it into a harbor then. In this process, two typical mission phases are identified in brief, namely, refloating the vessel and towing the vessel [3][4][5].…”

Section: Hazardous Events In Typical Marine Salvage Systemmentioning

confidence: 99%

Safety Analysis Methodology in Marine Salvage System Design

Liu¹,

Chen²,

Huang³

et al. 2015

Advances in Computer Science Research

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Abstract. In order to assess the risk of marine salvage system, the paper introduced a safety analysis method based on fuzzy-logic theory, which could deal with the uncertainties in scheme design process. The method consisted of three steps: (i) problem setup, (ii) risk assessment, (iii) risk mitigation and decision making. Then two mission phases were identified in typical salvage system, namely, refloating the vessel and towing the vessel. Main hazardous events of each mission phase were researched and a safety analysis model was introduced subsequently. An example was studied to demonstrate the application of the model, and the results showed that salvage method, the operation of pontoons and the safety of towline should be taken into account seriously in salvage system design.

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“…b) The width of curved channel According to the theory of ship operation, determine the towing fleet required width for navigation without wind action when through bend channel B 1 wind-induced drift B F [12]. And based on the theory of superposition principle, we can obtain the channel width which is the typical types of vessels' required by with the influence of wind and current.…”

Section: ) the Calculation Parameter That Considered The Influence Ofmentioning

confidence: 99%

Research on the Large Steel Cofferdam Floating Scheme

Wang¹,

Ma²

2014

Proceedings of the International Conference on Logistics, Engineering, Management and Computer Science

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Abstract-Steel cofferdam is essential for the construction of the large bridge, which is featured by its huge volume and heavy weight. When steel cofferdam has been built in the shipyard, it would be transit to the bridge construction site by way of waterway. Owing to its no-powered self-propelled, it should be towed through tugboat. Based on the transition of the steel cofferdam for the east Yangtze River Bridge, we propose the floating scheme for the transportation of gigantic steel cofferdam. Our studies are conducting systematically from the floating formation scheme while the navigational environments are taken into account. Within our research, the safe and effective floating transition scheme is devised scientifically. The effectiveness of our steel cofferdam transition scheme is verified by the production instance.

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Course stability of a ship towing system in wind

Cited by 39 publications

References 7 publications

Numerical Investigation on Nonlinear Dynamic Responses of a Towed Vessel in Calm Water

Numerical Investigation on Nonlinear Dynamic Responses of a Towed Vessel in Calm Water

Safety Analysis Methodology in Marine Salvage System Design

Research on the Large Steel Cofferdam Floating Scheme

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