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

2008 ◽  
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.

scholarly journals PROFITABLE HIGH-SPEED PASSENGER VESSEL FOR SHORT LINES AT SEA

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.  

scholarly journals EXAMINATION OF THE WEED FLORA OF RUDER HABITATS AND THE POSSIBILITY OF SUPPRESSION WITH HERBICIDES

2018 ◽  
Vol 6 (4) ◽  
pp. 329-332
Author(s):  
Milić Vojinović ◽  
Jelica Živić ◽  
Sanja Perić ◽  
Miroljub Aksić
Keyword(s):  
Chenopodium Album ◽  
Working Environment ◽  
Xanthium Strumarium ◽  
Weed Species ◽  
Construction Sites ◽  
Convolvulus Arvensis ◽  
Human Settlements ◽  
Time Of Application ◽  
Vegetation Complex ◽  
Selection Of

Ruderal flora, as well as the vegetation that flora forms, represent an extremely dynamic floristic-vegetation complex and arean integral part of the most immediate living and working environment of human. It is formed and developed mainly in human settlements, as well as in the other anthropogenic environments that are occasionally or permanently under direct or indirect influence of various forms of human activity. Ruderal vegetation is found not only directly around the settlements, but also around all urban and accompanying facilities: along roads, paths and fences around houses, yards, walls and roofs, in avenues, on ruins, construction sites, landfills, along railway tracks, road and defense embankments, on wet and nitrified banks of rivers, near human settlements, in abandoned lawns, on the street walks with sandy areas, cemeteries, in degraded pastures, forests, etc. This essay presents the distribution and representation of economically harmful, invasive and quarantine weed species (Abutilon theophrasti, Agropyrumrepens, Amaranthusretroflexus, Calystegiasepium, Cirsiumarvense, Chenopodium album, Chenopodiumhybridum, Convolvulus arvensis, Cynodondactylon, Daturastramonium, Sonchusarvensis, Sorghum halepense, Xanthium strumarium…) at ten sites in the Nisava district. The assessment of species representation was done in two shootings (May and August) according to scale 1-4. The proper selection of herbicides depends, in a large extent, on the presence of dominant weed species and on the time of application.

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

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).

Optimal selection of the supporting points of large component aligned and positioned by parallel manipulator

2016 ◽  
Vol 230 (17) ◽  
pp. 3066-3075
Author(s):  
Hongshuang Zhang ◽  
Junxia Jiang ◽  
Yinglin Ke ◽  
Qing Wang
Keyword(s):  
Parallel Manipulator ◽  
Stability Index ◽  
Stiffness Index ◽  
Performance Indices ◽  
Large Component ◽  
Global Performance ◽  
Effective Selection ◽  
Capacity Index ◽  
Six Degree Of Freedom ◽  
Selection Of

Large components such as wing sections should be aligned and positioned in a desired position prior to the final manufacturing or assembly, so a digital alignment and position device based on six degree of freedom parallel manipulator with several prismatic-prismatic-prismatic-spherical branches was designed and fabricated to meet the needs. The digital alignment and position device is an alignment device based on the parallel manipulator, and it is also a positioning and holding fixture for large components manufacturing or assembly. In order to effectively and efficiently select the supporting points of large component where the digital alignment and position device branch is connected with, the performance of the parallel manipulator and the fixture should be comprehensively analyzed at the same time. The global performance indices such as the dexterity index, the bearing capacity index, and the stiffness index are calculated based on the mechanism Jacobean matrix of the parallel manipulator, and the positioning stability index is calculated based on the position Jacobean matrix of the fixture. The results show that the global performance indices are not related to the pose, but the positioning stability index is; in addition, all indices rely on the originally selected supporting points and provide the basis for the effective selection of the supporting points for large component aligned and positioned by the digital alignment and position device, which is based on parallel manipulator with prismatic- prismatic-prismatic-spherical pairs.

Discussion on Compensation Factor for Large-Radius Bending Die

2013 ◽  
Vol 441 ◽  
pp. 44-47
Author(s):  
Xiao Lei Qian ◽  
Yi Liu ◽  
Rui Guo ◽  
Yuan Qing Zhang ◽  
Guo Qiang Wang
Keyword(s):  
Large Radius ◽  
Automatic Compensation ◽  
Proper Selection ◽  
Die Geometry ◽  
Compensation Factor ◽  
Metal Sheets ◽  
One Step ◽  
Compensation Program ◽  
Selection Of ◽  
The Ideal

For large-radius bending metal sheets with severe springback, an automatic compensation program based on APDL language was developed to achieve the ideal die geometry. To raise compensation efficiency, the range of the ideal compensation factor based on one-step springback analysis was deduced, and tests prove that more iterations will be needed if compensation factor was beyond the range, and proper selection of compensation factor among the range can be conducive to high compensation efficiency.

scholarly journals Crystal Structure of Neurotropism-Associated Variable Surface Protein 1 (Vsp1) of Borrelia turicatae

2006 ◽  
Vol 188 (12) ◽  
pp. 4522-4530 ◽  
Author(s):  
Catherine L. Lawson ◽  
Brian H. Yung ◽  
Alan G. Barbour ◽  
Wolfram R. Zückert
Keyword(s):  
Antigenic Variation ◽  
Surface Protein ◽  
Homology Model ◽  
Relapsing Fever ◽  
Disease Manifestation ◽  
Small Water ◽  
Surface Patches ◽  
Variable Surface ◽  
Acidic Glycosaminoglycans ◽  
Selection Of

ABSTRACT Vsp surface lipoproteins are serotype-defining antigens of relapsing fever spirochetes that undergo multiphasic antigenic variation to allow bacterial persistence in spite of an immune response. Two isogenic serotypes of Borrelia turicatae strain Oz1 differ in their Vsp sequences and in disease manifestations in infected mice: Vsp1 is associated with the selection of a neurological niche, while Vsp2 is associated with blood and skin infection. We report here crystal structures of the Vsp1 dimer at 2.7 and 2.2 Å. The structures confirm that relapsing fever Vsp proteins share a common helical fold with OspCs of Lyme disease-causing Borrelia. The fold features an inner stem formed by highly conserved N and C termini and an outer “dome” formed by the variable central residues. Both Vsp1 and OspC structures possess small water-filled cavities, or pockets, that are lined largely by variable residues and are thus highly variable in shape. These features appear to signify tolerance of the Vsp-OspC fold for imperfect packing of residues at its antigenic surface. Structural comparison of Vsp1 with a homology model for Vsp2 suggests that observed differences in disease manifestation may arise in part from distinct differences in electrostatic surface properties; additional predicted positively charged surface patches on Vsp2 compared to Vsp1 may be sufficient to explain the relative propensity of Vsp2 to bind to acidic glycosaminoglycans.

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

2013 ◽  
Vol 12 (3) ◽  
pp. 286-292 ◽  
Author(s):  
Xiufeng Zhang ◽  
Zhenwang Lyu ◽  
Yong Yin ◽  
Yicheng Jin
Keyword(s):  
Mathematical Model ◽  
Small Water ◽  
Plane Area

scholarly journals Selection of SARS-CoV-2 main protease inhibitor using structure-based virtual screening

2021 ◽  
Author(s):  
Abdulrahim R Hakami ◽  
Ahmed H Bakheit ◽  
Abdulrahman A Almehizia ◽  
Mohammed Y Ghazwani
Keyword(s):  
Virtual Screening ◽  
Experimental Studies ◽  
Dynamics Simulation ◽  
Radius Of Gyration ◽  
Nonstructural Proteins ◽  
Sars Coronavirus ◽  
Main Protease ◽  
Zinc Database ◽  
Simulation Results ◽  
Selection Of

Background: Conserved domains within SARS coronavirus 2 nonstructural proteins represent key targets for the design of novel inhibitors. Methods: The authors aimed to identify potential SARS coronavirus 2 NSP5 inhibitors using the ZINC database along with structure-based virtual screening and molecular dynamics simulation. Results: Of 13,840 compounds, 353 with robust docking scores were initially chosen, of which ten hit compounds were selected as candidates for detailed analyses. Three compounds were selected as coronavirus NSP5 inhibitors after passing absorption, distribution, metabolism, excretion and toxicity study; root and mean square deviation; and radius of gyration calculations. Conclusion: ZINC000049899562, ZINC000169336666 and ZINC000095542577 are potential NSP5 protease inhibitors that warrant further experimental studies.

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