Experimental investigation of free-running ship manoeuvers under extreme shallow water conditions

Mucha, Philipp; Dettmann, Thorsten; Ferrari, Victor A.; Moctar, Ould el

doi:10.1016/j.apor.2018.09.008

Cited by 23 publications

(8 citation statements)

References 5 publications

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“…The difference between increasing ship dimensions and unchanged navigation infrastructures has raised awareness of navigational analyzes for navigation in shallow waters. Predicting the ship's maneuverability under such conditions is critical and has led to the increasing use of ship handling simulators [3].…”

Section: Hydrodynamic Forces Acting On a Shipmentioning

confidence: 99%

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The Influence of Shallow Waters on the Maneuvering of Large Ships

Maljković¹,

Pavić²,

Perkovič³

et al. 2023

JMS

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The increasing demand for goods that can be transported by sea and the reduction in transportation costs have led to a trend toward larger ships. The increase in ship capacity leads to an increase in ship length and, thus, a decrease in transportation costs. The maneuverability of large ships in shallow water when calling at ports is becoming increasingly difficult. This is due to the discrepancy between increasing ship dimensions and unchanged waterway structures such as approach channels, harbors, and ports. The maneuverability of a vessel in shallow waters is different from the maneuverability in deep waters. The reasons for this are due to the shallow water effect. Shallow water affects the maneuverability of ships due to hydrodynamic forces caused by the current, shallower depth under the keel and proximity to the shore. It is a major challenge both for shipbuilders to design such vessels and for shipowners to have trained and well-educated officers who can navigate large vessels in shallow waters. This article presents the effects of shallow waters on large ship maneuvering and mathematical models that have been used to predict ship behavior under the influence of these forces.

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Section: Hydrodynamic Forces Acting On a Shipmentioning

confidence: 99%

“…Ship handling in such conditions is a significant challenge for pilots, masters, and watch officers. Predicting the ship's maneuvering characteristics in such situations is very important [3].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Shallow Waters on the Maneuvering of Large Ships

Maljković¹,

Pavić²,

Perkovič³

et al. 2023

JMS

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“…L CG is measured from the midship, which is half of LOA. The symbol +L CG indicates that the position of L CG is forward of the midship, and -L CG indicates that the position of L CG is at the aft of midship [55]. Therefore, referring to Fig.…”

Section: Fig 12 Dcg Is the Distance Between The Ship's Bridge (Lsb) And The Ship's Longitudinal Centre Of Gravity (Lcg)mentioning

confidence: 99%

Development of WOP Mathematical Model for Optimum Track-Keeping. A Ship Simulation Study Using VLCC, Focusing on Hard Over Rudder Turning Circle with Three Stages of Validation Analysis

Kamis

Fuad

Ashaari

et al. 2021

Polish Maritime Research

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Navigational safety necessitates careful route monitoring, which includes staying on the planned course. For a ship to achieve effective route monitoring while changing course, a wheel over point (WOP) must be precisely calculated and marked on a charted course. The reason is to warn the watchkeeping officer that the ship must make a course alteration to prevent overshooting the intended route. One of the techniques for appraising the WOP is the advance transfer technique (ATT). During a practical review by means of an electronic and paper chart work exercise of the ATT, this study discovered two research gaps related to the technique. Following that, this study created an improved advance transfer mathematical model (ATMM) by restructuring the use of the ship’s turning circle to overcome the limitations discovered. To validate the improvement of the ATMM over the ATT, data were collected by evaluating both methods using a ship simulator and performing a manoeuvring analysis. The data, specifically the reduction in the cross-track distance (XTD), was validated in three verification stages: compliance with XTL, percentage change, and Mann‒Whitney U test using IBM SPSS. In comparison to the ATT, the ATMM produces better results in terms of the course-keeping capability and it can be implemented as an algorithm in an integrated bridge navigation system for autonomous ship navigation safety.

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“…Xu et al [18] studied the impact of shallow water on the vessel steering model through experimentation with a free-running ship model. Mucha et al [19] conducted an experimental investigation on the manoeuvring capabilities of a free-running inland waterway ship under extremely shallow water conditions. The experimental data include results from repeatability studies, serving as potential validation for manoeuvring simulations.…”

Section: Introductionmentioning

confidence: 99%

Effect of Sampling Rate in Sea Trial Tests on the Estimation of Hydrodynamic Parameters for a Nonlinear Ship Manoeuvring Model

Xu,

Pires da Silva,

Guedes Soares

2024

JMSE

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This paper explores the impact of sampling rates during sea trials on the estimation of hydrodynamic parameters in a nonlinear manoeuvring model. Sea trials were carried out using an offshore patrol vessel and test data were collected. A nonlinear manoeuvring model is introduced to characterise the ship’s manoeuvring motion, and the truncated least squares support vector machine is employed to estimate nondimensional hydrodynamic coefficients and their corresponding uncertainties using the 25°–25° zigzag test. To assess the influence of the sampling rates, the training set is resampled offline with 14 sampling rates, ranging from 0.2 Hz to 5 Hz, encompassing a rate 10 times the highest frequency component of the signal of interest. The results show that the higher sampling rate can significantly diminish the parameter uncertainty. To obtain a robust estimation of linear and nonlinear hydrodynamic coefficients, the sampling rate should be higher than 10 times the highest frequency component of the signal of interest, and 3–5 Hz is recommended for the case in this paper. The validation is also carried out, which indicates that the proposed truncated least square support vector machine can provide a robust parameter estimation.

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Experimental investigation of free-running ship manoeuvers under extreme shallow water conditions

Cited by 23 publications

References 5 publications

The Influence of Shallow Waters on the Maneuvering of Large Ships

The Influence of Shallow Waters on the Maneuvering of Large Ships

Development of WOP Mathematical Model for Optimum Track-Keeping. A Ship Simulation Study Using VLCC, Focusing on Hard Over Rudder Turning Circle with Three Stages of Validation Analysis

Effect of Sampling Rate in Sea Trial Tests on the Estimation of Hydrodynamic Parameters for a Nonlinear Ship Manoeuvring Model

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