Hull form optimization in the conceptual design stage considering operational efficiency in waves

Jung, Yoo-Won; Kim, Yonghwan

doi:10.1177/1475090218781115

Cited by 9 publications

(10 citation statements)

References 14 publications

(16 reference statements)

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“…Many studies that use regression models for preliminary predictions and optimisations during the early design stage are carried out and presented in the literature. Some recent publications that have addressed and used statistical regression models in multi-criteria ship optimisations, parametric predictions of resistance and power, evolutionary algorithm and techniques for automation of hull form design, verifications with CFD and experimental data can be found in references [10,16,17,18,19,20,21]. A recent publication [22] provides helpful considerations on how to estimate Energy Efficiency Operational Indicator (EEOI), as part of Ship Energy Efficiency Management Plan (SEEMP) proposed by the International Maritime Organisation (IMO), based on the Automatic Identification System (AIS) data and application of Holtrop Mennen method.…”

Section: Introductionmentioning

confidence: 99%

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2022

brod

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Preliminary prediction of resistance and power is a fundamental aspect of the ship design process since they directly influence the developments of the design process, fuel consumption and costs, and environmental impact from the early design stage. Parametric predictions of resistance and power, based mainly on statistical regression models that are also ideal for computer programming, are often performed during initial design stages, providing rapid predictions and optimisations for minimum resistance. The paper aims to present the results of the comparative analysis on some conventional hulls of the predictive accuracy of a computer program developed by the author for parametric predictions of resistance and power of ships. The program (entitled Ship Power V 1.0) is developed in the Visual Basic 6.0 environment based on two well-known regression models Holtrop and Van Oortmerssen. The program can perform detailed predictions of resistance and power, resistance coefficients, propeller thrust, hull efficiency, wake, and trust fractions, with no restriction on the number of velocities. In this study, only the analysis of the accuracy of resistance and power prediction is considered. Results of the comparative analysis of the computational procedures of Ship Power V 1.0 versus experimental data, and against results of another well-known commercial software, performed on three models of the Ridgely-Nevitt trawler series and KCS hull have shown a good level of accuracy and reliability as other well-known commercial software.

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Section: Introductionmentioning

confidence: 99%

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2022

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“…In general, the reduction of resistance can be done by optimizing the shape of the hull [19][20][21]. In addition, to reduce the resistance experienced by the ship significantly, it can be carried out by installing hydrofoil [21], and by using stern flaps [22].…”

Section: Introductionmentioning

confidence: 99%

Study Reduction of Resistance on The Flat Hull Ship of The Semi-Trimaran Model: Hull Vane Vs Stern Foil

Nabawi

Syahril

Primawati

2021

CFDL

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Flat hull ships is appraised for its superiority due to the manufacturing simplicity and lower investment costs, yet the ship has its own weakness for it requires a greater resistance. As a matter of fact, a significant reduction on the resistance can be done with foil installation but it is necessary to study the optimal position of the foil installation. This study is aimed at revealing the effectiveness of the Hull Vane and Stern Foil installation in reducing the resistance experienced by the flat hull ship of the semi-trimaran model. The research was conducted by comparing the resistance experienced by the flat hull ship of the semi-trimaran model without foil, Hull vane and Stern foil installations. In addition, the disclosure of resistance experienced by each ship model was carried out by using CFD simulation. The simulation results revealed that the installation of the Hull vane and Stern foil was able to reduce the resistance experienced by the flat hull ship of the semi-trimaran model. The largest reduction occurred in Froude number 1.1, where the Hull vane installation was able to reduce resistance by 12.44% and on the ship model with Stern foil installation the resistance reduction was 5.25%. Based on the results of this CFD simulation, it can be concluded that the Hull Vane installation is more optimal in reducing resistance on the flat hull ship of the semi-trimaran model.

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“…Meanwhile, the hull forms that optimized the operational efficiency obtained from these two studies were modified into forms that sharpened the bow region and reduced the effect of the bulbous bow. Jung and Kim [20] performed multi-objective optimization to minimize both the total resistance and speed reduction in a tanker due to waves. Here, the strip method and the far-field method were used for the analysis of a seakeeping problem and the added resistance due to waves, respectively, and global hull deformations were applied by varying certain principal dimensions.…”

Section: Introductionmentioning

confidence: 99%

Study on Hull Optimization Process Considering Operational Efficiency in Waves

Kim

Lee

et al. 2021

Processes

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This study investigates the optimization of the hull form of a tanker, considering the operational efficiency in waves, in accordance with the recent Energy Efficiency Design Index regulation. For this purpose, the total resistance and speed loss of the ship under representative sea conditions were minimized simultaneously. The total resistance was divided into three components: calm water resistance, added resistance due to wind, and to waves. The first two components were calculated using regression formulas, and the last component was estimated using the strip theory, far-field method, and the short-wave correction formula. Next, prismatic coefficient, waterline length, waterplane area, and flare angle were selected as design variables from the perspective of operational efficiency. The hull form was described as a combination of cross-sectional curves. A combination of the method shifting these sections in the longitudinal direction and the Free-Form Deformation method was used to deform the hull. As a result of applying the non-dominated sorting genetic algorithm to a tanker, the hull was deformed thinner and longer, and it was determined that the total resistance and speed loss were reduced by 3.58 and 10.2%, respectively. In particular, the added resistance due to waves decreased significantly compared to the calm water resistance, which implies that the present tendency differs from conventional ship design that optimizes only the calm water resistance.

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Hull form optimization in the conceptual design stage considering operational efficiency in waves

Cited by 9 publications

References 14 publications

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Study Reduction of Resistance on The Flat Hull Ship of The Semi-Trimaran Model: Hull Vane Vs Stern Foil

Study on Hull Optimization Process Considering Operational Efficiency in Waves

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