A Study on Determination of Required Tug Force and Number of Tugs in Port Maneuvers

Zorba, Yusuf; Nas, Selçuk

doi:10.5505/jems.2016.78941

Cited by 2 publications

(3 citation statements)

References 2 publications

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“…As an example of these developments, an increase in ship sizes and ship traffic, improvement of cargo handling equipment in ports, shortening of ships' stay in ports, and so on can be given. 3 According to UNCTAD (United Nations Conference on Trade and Development) statistics, the world merchant ship fleet has increased significantly in terms of ''deadweight tons'' in recent years. 4 For example, between 2019 and 2020, the world merchant ship fleet grew by 4.1%.…”

Section: Introductionmentioning

confidence: 99%

“…It is important for towage service providers to pay attention to efficiency while making new investments, in terms of operating costs and service quality. The factors affecting the efficiency of towage services include number of tugboats (NT), 7,8 bollard pulls of tugboats, 3 port area size, 1 waiting time of ships to receive towage services, 9,10 tugboats’ parking locations, 1 and frequency of ships arriving in port area. 7 In addition, due to the high costs of tugboats, which are the sources of towage services, organizations are faced with high investment costs.…”

Section: Introductionmentioning

confidence: 99%

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A simulation model for resource allocation in port towage services

Özkan,

Nas

2023

SIMULATION

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In the face of developments in maritime transportation due to globalization, ports are tending toward new tugboat investments in order to respond to the increasing demand. Due to the high costs of tugboats, organizations may face high investment costs. It is important to determine the most suitable number of tugboats, considering the variables in a port area where towage services will be provided. In this study, a simulation model was developed to determine sufficient tugboat allocation according to some variables in ports. The simulation model was subjected to various experiments, and statistical analyses of the obtained results were performed. The relationships between the variables affecting the level of towage service were revealed.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A simulation model for resource allocation in port towage services

Özkan,

Nas

2023

SIMULATION

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“…Ship's maneuverability is the ability of a ship to keep or change its state of motion under the control actions(i.e. tugboats in the harbor maneuvers [1]). There are different ways for the prediction of a ship's maneuverability, i.e.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Mathematical Models for Tankers' Maneuvering Motions

Köse¹

2017

J ETA Maritime Sci

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In this study, the maneuvering performance of two tanker ships, KVLCC1 and KVLCC2 which have different stern forms are predicted using a system-based method. Two different 3 DOF (degrees of freedom) mathematical models based on the MMG(Maneuvering Modeling Group) concept areappliedwith the difference in representing lateral force and yawing moment by second and third order polynomials respectively. Hydrodynamic coefficients and related parameters used in the mathematical models of the same scale models of KVLCC1 and KVLCC2 ships are estimated by using experimental data of NMRI (National Maritime Research Institute). The simulations of turning circle with rudder angle ±35 o , zigzag(±10 o /±10 o) and zigzag (±20 o /±20 o) maneuvers are carried out and compared with free running model test data of MARIN (Maritime Research Institute Netherlands) in this study. As a result of the analysis, it can be summarised that MMG model based on the third order polynomial is superior to the one based on the second order polynomial in view of estimation accuracy of lateral hull force and yawing moment.

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A Study on Determination of Required Tug Force and Number of Tugs in Port Maneuvers

Abstract: Öz

Cited by 2 publications

References 2 publications

A simulation model for resource allocation in port towage services

A simulation model for resource allocation in port towage services

Evaluation of Mathematical Models for Tankers' Maneuvering Motions

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