Optimisation of Hull Form of Ocean-Going Trawler

Zhao, Cheng; Wang, Wei; Jia, Pan‐Pan; Xie, Yonghui; Design, Marine

doi:10.21278/brod72403

Cited by 19 publications

(11 citation statements)

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“…To assure that the generated 3D hulls models fitted the data of the real models W-10; W-11; W-12, the 3D CAD models were checked against the main known parameters as presented in table 1, and the process of generation of the surfaces of the 3D hull was repeated until a very satisfactory level of approximations were achieved. Figures 5,6,7 show the wireframe and surface model of the 3D modelled hulls.…”

Section: Resultsmentioning

confidence: 99%

“…[3] The choice of prediction method of resistance and power is affected by several factors such as the available capacity and tools, the level of accuracy, available funds, and the current development stage of the ship design process. [1,2] Nowadays, Computational Fluid Dynamic (CFD) simulations are increasingly used for predictions of resistance of ships, becoming an important standard of ship design practices, as shown in references [4,5,6,7,8,9]. Despite this, it can be emphasized that these simulations are particularly appropriate when the main parameters of the ship, main dimensions, and hull form coefficients have been defined, or have a slight variance, and the main attention is focused on the variation of the local geometry of the hull form.…”

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: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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2022

brod

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“…For the sake of reduction of the computational time, only half of the computational domain is discretized by the unstructured hexahedral mesh using a trimmed cell mesher [28]. The prism layer is generated at the hull surface based on its thickness, the number of cell layers and the size distribution of the layers.…”

Section: Methods For the Prediction Of Resistance And Effective Power...mentioning

confidence: 99%

Reconstruction of Hull Form of Traditional Croatian Fishing Vessel and Prediction of Eff ective Power

Degiuli¹,

Farkaš²,

Martić³

et al. 2023

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Recently, an increasing attention is given to preservation and popularization of Croatian traditional boat building, which plays an important role in Croatian cultural and national heritage. Reconstruction and revitalization projects of individual historical vessels are key factors within preservation process, where the lack of technical documentation is one of the main issues. In this paper, a simple and efficient procedure for taking offsets of a traditional fishing vessel guc is presented to document and preserve the traditional Croatian vessel form. A 3D model of a guc is generated using the points on the hull surface obtained by the manual measurement and a fairing process. Numerical simulations of the resistance test for a fishing vessel are carried out for a wide range of speeds, and the curve of effective power as a function of vessel speed is provided.

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“…In addition to these hydrodynamic problems, these facts can cause poor comfort. However, appendages such as interceptor, trim tab, and transom wedge can be adopted to improve not only the seakeeping performance but also the comfort [4] whie the optimization of conventional type of yachts can be made by changing the bulbous form [5], [6].…”

Section: Introductionmentioning

confidence: 99%

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2023

brod

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Nowadays, interceptors are often used to decrease total resistance and enhance comfort by reducing dynamic trim for high-speed planing vessels. They can be controlled manually as well as automatically by using a suitable closed-loop control system. Thus, in the present study, an automatically controllable system is presented to minimize the total resistance by reducing the dynamic trim in calm water. To reach this aim, a mathematical model which can represent the 2 degree of freedom vertical motion of a prismatic planing vessel is presented. The coefficients used in the model are calculated by using the Savitsky method. The standard dynamic trim angle and the optimum ones in terms of resistance are calculated by using the same method. For control action, a linear full state feedback control strategy (linear quadratic regulator) is applied, and instantaneous blade heights are found considering the change in forward speed. Therefore, the control-oriented model is able to change the blade height to reach the optimum trim angle in terms of the total resistance of the vessel for different forward speeds and speed profiles. The results show that the designed linear quadratic regulator control strategy is successful for reference trim tracking problems.

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Optimisation of Hull Form of Ocean-Going Trawler

Cited by 19 publications

References 0 publications

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Reconstruction of Hull Form of Traditional Croatian Fishing Vessel and Prediction of Eff ective Power

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