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Content available Hydrodynamic performance analysis of a modified sandglass- -type FPSO in regular waves using boundary element method
Graylee Adeleh, Yousefifard Mahdi
Zeszyty Naukowe Akademii Morskiej w Szczecinie
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2020
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nr 64 (136)
25--35
EN
This paper presents a numerical investigation of the hydrodynamic performance of a modified sandglass-type FPSO (Floating Production, Storage and Offloading) with different geometrical parameters. The influence of the roll damping plate on heave and pitch motions of the FPSO was studied in regular waves. To estimate the hydrodynamic performance and utilize the results on the design stage of the FPSO, the boundary element method (BEM) was used. Furthermore, the hydrodynamic performance of two cylindrical and sandglass-type FPSOs under the same conditions was compared in different waves. Five sandglass-type FPSOs with dissimilar inclination angles were utilized with the constant draft. The effects of different inclination angles, including various radii of water-plane part of the floating object on hydrodynamic responses and wave forces applied to the FPSO, were investigated, and presented here. Numerical results were compared against published experimental data of a sandglass-type model, and good agreement was achieved. Based on the simulation results, a conclusion that a sandglass-type FPSO with the inclination angle of 35 degrees proposes proper hydrodynamic performance in both heave and pitch motions for all ranges of wave frequencies was reached. In addition, as it was predicted, the effect of heading sea on a sandglass-type FPSO was significant compared to other wave directions. Finally, by adding a damper plate to the floor of the platform, its hydrodynamic performance is improved. For numerical analysis of the modified FPSO, three different damper sizes are used to investigate its effect on the reduction of the pitch motion amplitude in waves.
2
Content available Approximating the added resistance coefficient for a bulk carrier sailing in head sea conditions based on its geometrical parameters and speed
Cepowski T.
Polish Maritime Research
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2016
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nr 4
8--15
EN
The article presents the mathematical function to calculate the added wave resistance transfer function for bulk carriers. Based on this function, the statistical mean added wave resistance generated by an irregular head wave with arbitrary statistical parameters can be forecasted. The input parameters are: waterplane area, waterplane coefficient, ship speed, and frequency of the regular wave. The model has been developed based on the theory of artificial neural networks. The presented function can be used in design analyses, and for planning shipping routes in situations when basic geometrical parameters of the hull are only available and not the full technical documentation. The article presents sample cases of use of this function to calculate the added wave resistance transfer function and the statistical mean added wave resistance. Another presented application refers to waterplane coefficient optimisation taking into account the added wave resistance at the stage of preliminary bulk carrier design.
3
Analysis of ship hull deformation and power transmission system working under the influence of regular wave
Murawski L., Ostachowicz W.
Zeszyty Naukowe Katedry Mechaniki Stosowanej / Politechnika Śląska
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2001
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z. 15
257-262
EN
The FEM algorithm for calculations of ship hull deformation in different ballast states on the calm water as well as on the excited regular wave was investigated in the scope of this work. The computer program in the Borland Builder C++ and Fortran program languages was presented. The software package was compiled under the operation system - Windows 98. The program performance correctness tests as well as analysis of 2000 TEU container hull operation on wave were investigated.
PL
W ramach pracy opracowano algorytm MES do obliczeń deformacji kadłuba statku w różnych stanach zabalastowania na wodzie spokojnej oraz na zadanej fali regularnej. Zaprezentowano program komputerowy w języku programowania Borland Builder C++ oraz Fortran. Omawiany pakiet programów został skompilowany pod system operacyjny - Windows 98. Przeprowadzono testy poprawności działania programu oraz analizę pracy kadłuba kontenerowca 2000 TEU na fali
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