SHIPS WITH SMALL WATER-PLANE AREA: THE MAIN INFORMATION

Ships with small water-plane area (below “SWA ships”) have very special shape of hulls. It is the reason of characteristic specificity of such ships. SWA ships usually are multi-hull ones. And as all multi-hulls, SWA ships differ from the comparable mono-hulls by bigger deck area relative the displacement and by simple ensuring of stability. There are some architectural types of SWA ships. Their differences are shown by the article. Relative area of deck and initial transverse stability of SWA ships are compared. Statistical data on performance: twin-hull SWA versus catamarans. Common specificity of and . The main external loads. Special method of designing. Main disadvantages. Conclusions, recommendation.

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Triple-hull ships with small water-plane area: Towing test results and some full-scale comparisons

Ships and Offshore Structures ◽

10.1533/saos.2006.0104 ◽

2006 ◽

Vol 1 (3) ◽

pp. 185-189 ◽

Cited By ~ 2

Author(s):

V. A. Dubrovsky

Keyword(s):

Full Scale ◽

Test Results ◽

Small Water ◽

Plane Area

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Experimental Study on a Motion of “Underwater Platform” Including Hydro-Elastic Deformation in Waves

Volume 6: Ocean Space Utilization ◽

10.1115/omae2015-41722 ◽

2015 ◽

Author(s):

Motohiko Murai ◽

Ken Haneda ◽

Jun Yamanoi ◽

Yuta Abe

Keyword(s):

Numerical Simulations ◽

Elastic Deformation ◽

Large Scale ◽

Offshore Wind ◽

Offshore Wind Turbine ◽

Wind Condition ◽

Small Motion ◽

Small Water ◽

Motion Characteristics ◽

Plane Area

A new type of floater for floating offshore wind turbine (FOWT) was proposed. The floater, named an “underwater platform”, aims at high economic efficiency of energy generation of floating wind farm. The underwater platform is a large scale submerged structure which has small water plane area and can support several wind turbines. It is expected that the platform has small motion characteristics in waves because of its small water plane area, and it contributes for FOWT to generate energy safety. In this study, the feasibility and usefulness study about the platform was carried out through experiments and numerical simulations. The first experiment was conducted with partial rigid model of the platform to verify the feasibility. From the experiment, it was confirmed that the model has small motion characteristics in waves. The experimental results were compared with numerical simulations of potential theory and they were well matched. Besides, the coupling analysis with aero-hydro dynamics was also carried out and it was confirmed that the stability of the platform was enough in steady wind condition. The second experiment was conducted with elastic body model to study the elastic deformation of the platform in waves. From the experiment, it was confirmed that the deformation is small when the draft was 250mm (50m in the actual model).

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Global Performance and Sloshing Analysis of a New Deep-Draft Semi-Submersible LNG FPSO

Volume 1: Offshore Technology ◽

10.1115/omae2008-58001 ◽

2008 ◽

Cited By ~ 1

Author(s):

Jang W. Kim ◽

Jim O’Sullivan ◽

Atle Steen ◽

John Halkyard

Keyword(s):

Operating Performance ◽

Radius Of Gyration ◽

Large Radius ◽

Construction Sites ◽

Small Water ◽

Global Performance ◽

Lng Liquefaction ◽

Selection Of ◽

Northwest Australia ◽

Plane Area

A new concept of LNG FPSO based on a deep-draft semi-submersible hull is introduced. With the deep draft, small water plane area, low center of gravity and large radius of gyration, the new LNG FPSO offers very low motions. This low-motion LNG FPSO platform provides more options and flexibilities in the selection of LNG liquefaction units, LNG containment systems, construction sites, installation methods, mooring systems (i.e. no requirements for weather-vaning), riser system and less down time compared with a conventional FPSO hull. Global performance and sloshing analyses for the new LNG FPSO hull and the conventional FPSO hull are performed to compare their operating performance for West Africa and the Northwest Australia environments.

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Mathematical model of small water-plane area twin-hull and application in marine simulator

Journal of Marine Science and Application ◽

10.1007/s11804-013-1203-0 ◽

2013 ◽

Vol 12 (3) ◽

pp. 286-292 ◽

Cited By ~ 3

Author(s):

Xiufeng Zhang ◽

Zhenwang Lyu ◽

Yong Yin ◽

Yicheng Jin

Keyword(s):

Mathematical Model ◽

Small Water ◽

Plane Area

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PROFITABLE HIGH-SPEED PASSENGER VESSEL FOR SHORT LINES AT SEA

International Journal of Research -GRANTHAALAYAH ◽

10.29121/granthaalayah.v8.i6.2020.453 ◽

2020 ◽

Vol 8 (6) ◽

pp. 142-149

Author(s):

Victor A. Dubrovsky

Keyword(s):

High Speed ◽

Point Of View ◽

Minimal Cost ◽

Small Water ◽

Alternative Option ◽

Motion Characteristics ◽

Passenger Vessel ◽

Selection Of ◽

Plane Area

The paper [1] had presented an alternative option of outrigger high-speed passenger vessel for short lines. Such ships can compete with existed ones from economy point of view if the firsts will have minimal cost of building and minimal operation price, firstly – because of minimal outlay of fuel, but for comparable service speed and capacity of passengers. Besides, usually small enough vessels are strongly affected by weather, by waves in main. It means, seaworthiness of such ships is a permanent problem if they must operate at more or less severe conditions of weather. Two newly proposed options of outrigger ships are described below: the first has small water-plane area of the main hull bow, and the second has small water-plane area of the main hull as a whole. The selection of the main dimensions are shown in main, the results are discussed from seaworthiness point of view. Both new options are recommended for further designing, including researching of motion characteristics and possible economy results.

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Investigation of Structural Response Due to Impact Load on the Small Water Plane Area Twin Hull Autonomous Surface Vehicles (SWATH-ASV)

Proceedings of the 6th International Seminar on Ocean and Coastal Engineering, Environmental and Natural Disaster Management ◽

10.5220/0008565001440148 ◽

2018 ◽

Author(s):

Ahmad Zakki ◽

Aris Triwiyatno ◽

Bandi Sasmito

Keyword(s):

Impact Load ◽

Structural Response ◽

Small Water ◽

Autonomous Surface Vehicles ◽

Plane Area

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Slow-speed ships with small water-plane area: methods of development

Ships and Offshore Structures ◽

10.1080/17445300802627894 ◽

2009 ◽

Vol 4 (2) ◽

pp. 189-193

Author(s):

Victor Dubrovsky

Keyword(s):

Slow Speed ◽

Small Water ◽

Plane Area

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Evaluation method for imaging plate resolution by means of phase contrast transfer function

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100139688 ◽

1995 ◽

Vol 53 ◽

pp. 662-663 ◽

Cited By ~ 1

Author(s):

T. Oikawa ◽

H. Kosugi ◽

F. Hosokawa ◽

D. Shindo ◽

M. Kersker

Keyword(s):

Transfer Function ◽

Phase Contrast ◽

Evaluation Method ◽

Amorphous Film ◽

Imaging Plate ◽

X Rays ◽

Special Shape ◽

Contrast Transfer Function ◽

Contrast Image ◽

Specimen Shape

Evaluation of the resolution of the Imaging Plate (IP) has been attempted by some methods. An evaluation method for IP resolution, which is not influenced by hard X-rays at higher accelerating voltages, was proposed previously by the present authors. This method, however, requires truoblesome experimental preperations partly because specially synthesized hematite was used as a specimen, and partly because a special shape of the specimen was used as a standard image. In this paper, a convenient evaluation method which is not infuenced by the specimen shape and image direction, is newly proposed. In this method, phase contrast images of thin amorphous film are used.Several diffraction rings are obtained by the Fourier transformation of a phase contrast image of thin amorphous film, taken at a large under focus. The rings show the spatial-frequency spectrum corresponding to the phase contrast transfer function (PCTF). The envelope function is obtained by connecting the peak intensities of the rings. The evelope function is offten used for evaluation of the instrument, because the function shows the performance of the electron microscope (EM).

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