scholarly journals Hull shape peculiarities of conventional and model icebreakers: analysis

2020 ◽  
Vol S-I (2) ◽  
pp. 63-67
Author(s):  
V. Platonov ◽  
◽  
V. Tryaskin ◽  
D. Isaeva ◽  
◽  
...  
Keyword(s):  
Data Base ◽  
Statistical Data ◽  
The Arctic ◽  
Performance Parameters ◽  
Design Data ◽  
Overall Design ◽  
Side Slope ◽  
Ice Loads ◽  
Russian Waters

This paper discusses hull shapes of conventional and modern icebreakers to analyse the peculiarities of their bows, sterns and parallel midbodies. It discusses main performance parameters, main dimensions and hull shape details of conventional and modern icebreakers. The data base generated in this study includes hull shape details for bow, parallel midbody and stern ice belt areas of conventional and modern icebreakers. This work also yielded mean statistical data making it possible to judge how waterline slope and side slope depend on the position of design section. This study summarizes and generalizes overall design data for the majority of icebreakers operating in freezing Russian waters, including the Arctic. Depending on hull shape, displacement and ice class, this paper identifies three representative groups of icebreakers. The results of this study were further used to analyse the loads on ice belt structures of icebreakers, as well as to develop a system of relationships intended to obtain design ice loads as per RS Rules.

Advanced Weathervaning in Ice

2011 ◽  
Author(s):  
William Hidding ◽  
Guillaume Bonnaffoux ◽  
Mamoun Naciri
Keyword(s):  
Rapid Change ◽  
Ice Sheet ◽  
Model Tests ◽  
The Arctic ◽  
Mooring System ◽  
Sudden Increase ◽  
Time Step ◽  
Ice Loads ◽  
Level Ice ◽  
Drift Direction

The reported presence of one third of remaining fossil reserves in the Arctic has sparked a lot of interest from energy companies. This has raised the necessity of developing specific engineering tools to design safely and accurately arctic-compliant offshore structures. The mooring system design of a turret-moored vessel in ice-infested waters is a clear example of such a key engineering tool. In the arctic region, a turret-moored vessel shall be designed to face many ice features: level ice, ice ridges or even icebergs. Regarding specifically level ice, a turret-moored vessel will tend to align her heading (to weather vane) with the ice sheet drift direction in order to decrease the mooring loads applied by this ice sheet. For a vessel already embedded in an ice sheet, a rapid change in the ice drift direction will suddenly increase the ice loads before the weathervaning occurs. This sudden increase in mooring loads may be a governing event for the turret-mooring system and should therefore be understood and simulated properly to ensure a safe design. The paper presents ADWICE (Advanced Weathervaning in ICE), an engineering tool dedicated to the calculation of the weathervaning of ship-shaped vessels in level ice. In ADWICE, the ice load formulation relies on the Croasdale model. Ice loads are calculated and applied to the vessel quasi-statically at each time step. The software also updates the hull waterline contour at each time step in order to calculate precisely the locations of contact between the hull and the ice sheet. Model tests of a turret-moored vessel have been performed in an ice basin. Validation of the simulated response is performed by comparison with model tests results in terms of weathervaning time, maximum mooring loads, and vessel motions.

Parameter Sensitivity in Numerical Modelling of Ice-Structure Interaction With Cohesive Element Method

2016 ◽  
Author(s):  
Dianshi Feng ◽  
Sze Dai Pang ◽  
Jin Zhang
Keyword(s):  
Element Model ◽  
Offshore Structures ◽  
Parameter Sensitivity ◽  
The Arctic ◽  
Cohesive Element ◽  
Structure Interaction ◽  
Marine Structure ◽  
Ice Loads ◽  
The Stability ◽  
Element Method

The increasing marine activities in the Arctic has resulted in a growing demand for reliable structural designs in this region. Ice loads are a major concern to the designer of a marine structure in the arctic, and are often the principal factor that governs the structural design [Palmer and Croasdale, 2013]. With the rapid advancement in computational power, numerical method is becoming a useful tool for design of offshore structures subjected to ice actions. Cohesive element method (CEM), a method which has been widely utilized to simulate fracture in various materials ranging from metals to ceramics and composites as well as bi-material systems, has been recently applied to predict ice-structure interactions. Although it shows promising future for further applications, there are also some challenging issues like high mesh dependency, large variation in cohesive properties etc., yet to be resolved. In this study, a 3D finite element model with the use of CEM was developed in LS-DYNA for simulating ice-structure interaction. The stability of the model was investigated and a parameter sensitivity analysis was carried out for a better understanding of how each material parameter affects the simulation results.

scholarly journals Quality control procedures and methods of the CARINA database

2010 ◽  
Vol 2 (1) ◽  
pp. 35-49 ◽  
Author(s):  
T. Tanhua ◽  
S. van Heuven ◽  
R. M. Key ◽  
A. Velo ◽  
A. Olsen ◽  
...  
Keyword(s):  
Quality Control ◽  
Southern Ocean ◽  
Data Base ◽  
Least Square ◽  
The Arctic ◽  
Crossover Analysis ◽  
Abstract Data ◽  
Control Procedures ◽  
Data Files ◽  
Technical Details

Abstract. Data on the carbon and carbon relevant hydrographic and hydrochemical parameters from previously not publicly available cruises in the Arctic, Atlantic and Southern Ocean have been retrieved and merged to a new data base: CARINA (CARbon IN the Atlantic). These data have gone through rigorous quality control (QC) procedures to assure the highest possible quality and consistency. All CARINA data were subject to primary QC; a process in which data are studied in order to identify outliers and obvious errors. Additionally, secondary QC was performed for several of the measured parameters in the CARINA data base. Secondary QC is a process in which the data are objectively studied in order to quantify systematic differences in the reported values. This process involved crossover analysis, and as a second step the offsets derived from the crossover analysis were used to calculate corrections of the parameters measured on individual cruises using least square models. Significant biases found in the data have been corrected in the data products, i.e. three merged data files containing measured, calculated and interpolated data for each of the three regions (i.e. Arctic Mediterranean Seas, Atlantic, and Southern Ocean). Here we report on the technical details of the quality control and on tools that have been developed and used during the project, including procedures for crossover analysis and least square models. Furthermore, an interactive website for uploading of results, plots, comments etc. was developed and was of critical importance for the success of the project, this is also described here.

Development and Research of Management Information System Based on Multilayer Structure

2014 ◽  
Vol 687-691 ◽  
pp. 2347-2350
Author(s):  
Shuang Liu
Keyword(s):  
Information System ◽  
Data Base ◽  
Management Information System ◽  
Multilayer Structure ◽  
New Technology ◽  
Integrated Design ◽  
Management Information ◽  
Design Data ◽  
Sql Server 2000 ◽  
Whole Process

In the whole process of developing the management information system, people give priority to application of new technology and instrument such as the newly developed instrument Visual Studio from Microsoft. Connected with SQL Server 2000 data base, VB.NET, ASP.NET and ADO.NET technology are able to make the structure of softwares more reasonable, convenient and pragmatic, largely increasing the overall property of the software system. According to the steps of engineering design, this passage is to illustrate the entire system in an all-around way in terms of demand analysis, integrated design, data base design, safety design as well as report design. This passage is to illustrate a design process of a management information system based on C/S and B/S multilayer structure.

Analysis of the development of drifting ice formations impact on marine facilities assessment methods

2021 ◽  
pp. 119-130
Author(s):  
I. G. Silina ◽  
V. A. Ivanov ◽  
T. G. Ponomareva ◽  
S. V. Yakubovskaya
Keyword(s):  
Assessment Methods ◽  
The Arctic ◽  
Offshore Pipelines ◽  
Emergency Situations ◽  
High Resource ◽  
Significant Loading ◽  
Ice Loads ◽  
The Cost ◽  
Active Exploration ◽  
Cost Of Construction

The high resource potential of the Arctic determines the active exploration and development of these territories, in particular the Arctic continental shelf. The development of offshore fields is directly related to the issues of marine communications construction and operation in freezing waters. They are associated with minimization of environmental risks, reducing the cost of construction work, and ensuring reliable operation of underwater systems. The ice loads, especially, loads from ice gouging are considered one of the most significant loading conditions for such systems. Deformations of the soil around the pipeline during gouging may cause unacceptable deformations as a result of bending, which may lead to emergency situations. The article discusses the main features of ice gouging and the development of research and assessment methods for ice gouging impact on offshore pipelines. The article also provides the analysis of the research methods, their applications and limitations, and points out further research directions.

scholarly journals Assessment of tourism development in Arctic entities

2020 ◽  
Vol 175 ◽  
pp. 10010 ◽  
Author(s):  
Olga Lukina ◽  
Anna Kurochkina ◽  
Anna Karmanova
Keyword(s):  
Statistical Data ◽  
Tourism Development ◽  
The Arctic ◽  
Tourist Industry ◽  
Arctic Regions ◽  
Tourist Flows ◽  
The Subject ◽  
Further Development

The article reflects the main aspects of the development of the tourist industry of the Arctic regions. The characteristics of the tourist environment of each of the eight states forming the Arctic are presented. Dynamics of tourist flows of regions is considered. Trends in the further development of Arctic tourism are reflected. The analysis of statistical data on the subject under study is presented, conclusions on the topic are drawn.

Probabilistic Modeling of Extreme Value Distributions of Ice Loads on “Molikpaq” Platform for Sakhalin-II Project

2013 ◽  
Author(s):  
Alexander T. Bekker ◽  
Olga A. Sabodash ◽  
Roman G. Kovalenko
Keyword(s):  
Numerical Modeling ◽  
Return Period ◽  
Statistical Data ◽  
Extreme Values ◽  
Ice Cover ◽  
Offshore Structures ◽  
Extreme Value Distributions ◽  
Probabilistic Estimation ◽  
Ice Conditions ◽  
Ice Loads

Characteristics of the drifting ice cover and the scenarios of the ice loads on offshore structures are the major parameters defining durability and reliability of the ice-resistant platforms on the Sakhalin offshore. The study is devoted to the problems of probabilistic and numerical modeling of the process of interaction between the ice cover and the ice-resistant concrete structures on the Sakhalin offshore zone. Geometry of the “Molikpaq” (PA-A) platform for Sakhalin-II Project is used as an example. The input statistical data were received on the basis of full-scale observations of the ice conditions in the Piltun-Astokhskoe deposit area during 1989–2002. The distribution of probability exceedance of ice loads for various ice scenarios on the “Molikpaq” (PA-A) platform was received. A probabilistic estimation of extreme values of ice loads was carried out, taking into account return period of ice conditions.

scholarly journals CARINA TCO<sub>2</sub> data in the Atlantic Ocean

2010 ◽  
Vol 2 (2) ◽  
pp. 177-187 ◽  
Author(s):  
D. Pierrot ◽  
P. Brown ◽  
S. Van Heuven ◽  
T. Tanhua ◽  
U. Schuster ◽  
...  
Keyword(s):  
Quality Control ◽  
Atlantic Ocean ◽  
Southern Ocean ◽  
Data Base ◽  
Dissolved Inorganic Carbon ◽  
The Arctic ◽  
Data Set ◽  
Ocean Region ◽  
Crossover Analysis ◽  
Data Files

Abstract. Water column data of carbon and carbon-relevant hydrographic and hydrochemical parameters from 188 cruises in the Arctic Mediterranean Seas, Atlantic and Southern Ocean have been retrieved and merged in a new data base: the CARINA (CARbon IN the Atlantic) Project. These data have gone through rigorous quality control (QC) procedures so as to improve the quality and consistency of the data as much as possible. Secondary quality control, which involved objective study of data in order to quantify systematic differences in the reported values, was performed for the pertinent parameters in the CARINA data base. Systematic biases in the data have been tentatively corrected in the data products. The products are three merged data files with measured, adjusted and interpolated data of all cruises for each of the three CARINA regions (Arctic Mediterranean Seas, Atlantic and Southern Ocean). Ninety-eight cruises were conducted in the "Atlantic" defined as the region south of the Greenland-Iceland-Scotland Ridge and north of about 30° S. Here we report the details of the secondary QC which was done on the total dissolved inorganic carbon (TCO2) data and the adjustments that were applied to yield the final data product in the Atlantic. Procedures of quality control – including crossover analysis between stations and inversion analysis of all crossover data – are briefly described. Adjustments were applied to TCO2 measurements for 17 of the cruises in the Atlantic Ocean region. With these adjustments, the CARINA data base is consistent both internally as well as with GLODAP data, an oceanographic data set based on the WOCE Hydrographic Program in the 1990s, and is now suitable for accurate assessments of, for example, regional oceanic carbon inventories, uptake rates and model validation.

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