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Optimization of wigley hull Form in order to Ensure the Objective Functions of the Seakeeping Performance

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Journal of Marine Science and Application 2014年第4期13卷 422-429页

作者： Hassan Bagheri Hassan Ghassemi Department of Ocean Engineering Amirkabir University of Technology (A UT) Tehran 15875-4413 Iran

The research performed in this paper was carried out to investigate the computational procedure to design seakeeping optimized ship hull form. To reach the optimized hull form, four stages should be done, which consists of： generate alternative hull form, seakeeping calculations, objective functions and optimization techniques. There are many parameters that may be determined in ship hull form optimization. This paper deals with developed strip theory for determining the seakeeping performance, genetic algorithm （GA） as optimization method, high order equations for curve fitting of the hull form and finally reaching to the minimum bow vertical motion in regular head waves. The wigley hull is selected as an initial hull and carried to be optimized. Two cases are considered. For the first case, the only form coefficients of the hull （CB, CM, Cw, Cp） are changed and main dimensions （L, B, 7） are fixed. In the second case both hull form and main dimensions are varied simultaneously. Finally, optimized hull form and its seakeeping performances are presented. The results of optimization procedure demonstrate that the optimized hull forms yield a reduction in vertical motion and acceleration.

关键词： optimization genetic algorithm (GA) wigley hull hullform seakeeping

An iterative Rankine boundary element method for wave diffraction of a ship with forward speed

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Journal of Hydrodynamics 2014年第5期26卷 818-826页

作者：何广华 School of Naval Architecture and Ocean Engineering Harbin Institute of Technology at Weihai Department of Naval Architecture and Ocean Engineering Osaka UniversitySuitaOsakaJapan

A 3-D time-domain seakeeping analysis tool has been newly developed by using a higher-order boundary element method with the Rankine source as the kernel function. An iterative time-marching scheme for updating both kinematic and dynamic free-surface boundary conditions is adopted for achieving numerical accuracy and stability. A rectangular computational domain moving with the mean speed of ship is introduced. A damping beach at the outer portion of the truncated free surface is installed for satisfying the radiation condition. After numerical convergence checked, the diffraction unsteady problem of a wigley hull traveling with a constant forward speed in waves is studied. Extensive results including wave exciting forces, wave patterns and pressure distributions on the hull are presented to validate the efficiency and accuracy of the proposed 3-D time-domain iterative Rankine BEM approach. Computed results are compared to be in good agreement with the corresponding experimental data and other published numerical solutions.

关键词： Rankine panel method higher-order boundary element method (HOBEM) iterative scheme wigley hull wave exciting forces

RESEARCH ON THE METHOD AND CALCULATION OF THE NEW SLENDER-SHIP WAVE RESISTANCE THEORY

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Journal of Hydrodynamics 2003年第4期15卷 124-124页

作者： Ph.D.Candidate:Han Duan-feng College of Shipbuilding Engineering, Harbin Engineering University, Harbing 150001, ChinaSupervisor: Huang De-bo (Harbin Engineering Univ.) Members of Dissertation Defense Committee: Dai Yi-shan (Harbin Engineering Univ.)Chairman Zhu Dian-ming (Science and Technology Commission of Heilongjiang Province) Huang Sheng (Harbin Engineering Univ.) Xu Yu-ru (Harbin Engineering Univ.) Zhang Liang (Harbin Engineering Univ.) College of Shipbuilding Engineering Harbin Engineering University Harbing 150001 China

Analyses of the new slender-ship theory of wave resistance were made and corresponding calculation methods were proposed. Based on these theoretical methods, the calculations of wave resistance of near surface submersible, wigley hull and vertical/canted strut SWATHs were conducted. In the single and double integral parts of Green's function, the method of special function expansion and Chebyshev polynomial approach were adopted respectively. The formulas for zeroth-first-and second-order wave-making resistance were derived. In a towing tank, the calm water resistance experiment of SWATH model ASW-2 with canted strut was conducted and researched. The influences of waterline integral term, the surface mesh number, element node number, range of the integration and truncation of special function expansions on velocity potential and numerical results of resistance were investigated, and the difference between the zeroth-order and first-order wave resistance was analyzed. The theoretical calculation results agree well with the well-found model experimental results.

关键词： wave resistance Green's function,submerged ellipsoid wigley hull vertical/canted strut SWATH