scholarly journals Innovative developments of Krylov State Research Centre to improve the safety and reliability of vessels with podded trust units in extreme ice conditions

2018 ◽  
pp. 92-103
Author(s):  
Valerij Adamovich Belyashov ◽  
◽  
Nikolai Vasil'evich Vasilev ◽  
Vyacheslav Vladislavovich Makarov ◽  
Leonid Gennad'evich Pautov
Keyword(s):  
Research Centre ◽  
State Research ◽  
Safety And Reliability ◽  
Ice Conditions

Double Acting Tanker: Experiences from Model Tests and Sea Trials

2005 ◽  
Vol 219 (3) ◽  
pp. 109-119 ◽  
Author(s):  
P Trägärdh ◽  
P Lindell ◽  
N Sasaki
Keyword(s):  
Model Test ◽  
Oil And Gas ◽  
Single Point ◽  
Open Water ◽  
Model Tests ◽  
Water Model ◽  
Research Centre ◽  
Sea Trial ◽  
Cavitation Performance ◽  
Ice Conditions

The acronym DAT stands for double acting tanker, a concept where the ship is designed to run astern in heavy ice conditions while remaining hydrodynamically efficient for ahead propulsion in open water conditions. Two large aframax DATs - 106.000 dwt (deadweight tons) each - have been delivered by Sumitomo Heavy Industries to Fortum Oil and Gas OY. They are the first crude carriers built according to the DAT principle and also the first using pod propulsion from the beginning (Fig. 1). They will also be the world's largest crude carriers with ice class 1A super and are primarily intended for year-round transportation of North Sea crude to Fortum's refineries in the Gulf of Finland. The ships were appointed ‘ship of the year’ in Japan in 2003. SSPA was contracted by Sumitomo Heavy Industries to perform model tests. A comprehensive open water model test programme was used to investigate aspects of resistance and propulsion, manoeuvring, and cavitation performance. As the ship is designed to operate both in ahead and astern conditions for prolonged periods of time, most tests were performed both ahead and astern. Also, a simulation study of dynamic positioning at buoy or floating production, storage offshore (FPSO) loading was made by SSPA. Comprehensive tests of the ship's performance in ice were performed in the ice tank at MARC (Masa-Yards Artic Research Centre). The eight-month model testing and development campaign resulted in a ship with excellent propulsion and manoeuvring performance, especially with regard to the high ice class. Sea trials carried out with ship in August 2002 confirmed the results of the model test. Interesting experiences of the model test campaign and comparison between model test and sea trial results are presented, as well as some examples of single-point mooring simulations.

scholarly journals Advantages of modeling ABL properties to determine wind loads on structures

2018 ◽  
Vol 245 ◽  
pp. 09007 ◽  
Author(s):  
Evgenii Khrapunov ◽  
Sergei Solovev
Keyword(s):  
Boundary Layer ◽  
Wind Tunnel ◽  
Velocity Profile ◽  
Experimental Tests ◽  
Wind Loads ◽  
Research Centre ◽  
Oncoming Flow ◽  
Mean Velocity ◽  
State Research

In present paper we introduce the main advantages of modeling atmospheric boundary layer (ABL) properties for determination of mean and peak wind loads on structures. Experimental tests were carried out using wind tunnel with uniform velocity profile and new Landscape Wind tunnel (LWT) of Krylov State Research Centre. General characteristics of simulated boundary layer (such as mean velocity profile and turbulence intensity profile) are presented. For wind loads measurements model of Silsoe cube in a scale of 1:15 was used. Comparison of the data obtained at both test rigs with data published in early studies is performed. New data about aerodynamic forces acting on the model in range of angles of oncoming flow are presented. Algorithm for determination of peak wind loads is discussed.

Peculiarities of Multi-Legged Platform Operation in Ice Condition

2014 ◽  
Author(s):  
Evgeny Karulin ◽  
Marina Karulina
Keyword(s):  
Mutual Influence ◽  
Experimental Studies ◽  
Vertical Axis ◽  
Research Centre ◽  
Interaction Processes ◽  
Ice Drift ◽  
Ice Concentration ◽  
Broken Ice ◽  
Ice Conditions ◽  
Ice Floes

A usage of multi-legged structures in ice conditions involves some peculiarities that should be taken into account both while designing the platform and while planning technological operations nearby it. In 2010–2013 a range of theoretical and experimental studies were performed at the Krylov State Research Centre, St. Petersburg, Russia. The work aimed to investigate main peculiarities of multi-legged structure interaction with ice, such as 1). mutual influence on ice action on each leg, 2) jamming of the inner space between legs and blocking the space between the front legs with ice floes, and 3) arisen yaw moments about the platform vertical axis due to unsymmetrical ice action on the legs. Three series of model tests with various multi-legged structures models were carried out in the Ice Basin. The presented in the paper main results show effect of key parameters on the interaction processes and on the ice action. During the tests the following parameters were varying: distance between the legs, ice drift speed and direction, broken ice concentration and the ice pieces size. Also, the paper contains results of numerical simulations of some tested scenarios in broken ice conditions. The numerical model is based on discrete element method, and it enables to extend a range of the investigations.

scholarly journals Localization and elimination of glare in images of model ice surface

2020 ◽  
pp. 251-256
Author(s):  
И.А. Белянов ◽  
П.Н. Звягин
Keyword(s):  
Anisotropic Diffusion ◽  
Reconstruction Algorithm ◽  
Concentration Function ◽  
Automatic Recognition ◽  
Research Centre ◽  
Artificial Lighting ◽  
Saint Petersburg ◽  
Fine Grain ◽  
Ice Surface ◽  
State Research

Изображения, получаемые при проведении экспериментов в ледовом бассейне, как правило, содержат многочисленные блики от средств искусственного освещения и естественных источников света. Вследствие зернистой структуры моделированного льда, в рамках одного блика яркие пиксели чередуются с более темными. Такие дефекты изображений препятствуют их автоматическому распознаванию. В статье предложены способы локализации данных дефектов и алгоритм их исключения с восстановлением изображения. Метод локализации замещаемой области основан на использовании функции концентрации пикселей с высокими значениями интенсивности. Алгоритм восстановления изображения основан на итеративном применении методов интерполяции и анизотропной диффузии. Эффективность предложенного способа продемонстрирована на примере восстановления изображений поверхности моделированного льда, приготовленного по технологии Fine Grain в ледовом бассейне Крыловского государственного научного центра (Санкт-Петербург). Images obtained during experiments in an ice tank as a rule contain a lot of glare from artificial lighting and photo equipment. Due to the grainy structure of model ice, bright pixels alternate with darker ones. Therefore, such defects prevent automatic recognition of images. The article suggests the method for localization of light spots on the surface of model ice as well as the algorithm for their elimination and image restoration. The method of area replacement is based on the use of high intensity pixel concentration function and delta concentration function. The image reconstruction algorithm is based on iterative application of interpolation and anisotropic diffusion methods to the part of an image with localized light spot. The effectiveness of the proposed method is demonstrated by the example of restoring images of the surface of simulated ice prepared in accordance with the Fine Grain technology in the ice tank of the Krylov State Research Centre (Saint Petersburg).

Model Testing of Turret-Based Drill Ship in Ice Conditions

2013 ◽  
Author(s):  
Maksym V. Kovalyov ◽  
Aleksey A. Dobrodeev ◽  
Iryna L. Blagovidova ◽  
Kirill Ev. Sazonov ◽  
Leonid V. Kolchenko ◽  
...  
Keyword(s):  
Ice Sheet ◽  
Arctic Region ◽  
Research Centre ◽  
Federal State ◽  
Test Model ◽  
Solution Versus ◽  
System Use ◽  
Ice Conditions ◽  
Comparison Of The Results ◽  
Ice Resistance

Recently, process platforms and drill ships featuring anchor sea-keeping system equipped with a turret arrangement have increasingly been proposed for deep-water offshore applications to be operated in freezing seas. A possibility of environmentally-oriented yawing with the ship’s bow ahead of the resulting vector of environment actions provides the major advantage of the turret system use. The turret system allows passive positioning of the ship without activation of any propulsion means or thrusters, which is particularly important in ice conditions where ship controls can be difficult to operate. CDB Corall PJSC designed a promising turret-based drill ship (TBDS) intended to perform drill operations in seas of Russian Arctic region. The design is substantially different from drill ships and platforms conventionally considered for similar purposes. The adopted design solutions ensure significantly higher drill ship performances in ice conditions. The report includes results of TBDS model tests performed in the model basin of the Federal State Unitary Enterprise “Krylov State Research Centre”. Tests of ice resistance and tension of the anchor sea-keeping system have been incorporated in the test program, while the model was being interacted with the variable-thickness ice sheet at a 0° heading. Testing to investigate behavior of the interacted with ice ridge formations have also been performed at the same heading. The study of passive model yawing at 90° and 170° conditions made up a highly important part of the program. Such tests were performed both for model/ice sheet and model/ice ridge interaction types. In addition to measuring force parameters during the tests, changes in heading, heel and trim, as well as model displacements were also determined. Testing proved high ice resistance and maneuverability of the test model. The report includes comparison of the results obtained in model basin tests with other experimental data for models fitted with turret arrangement and anchor sea-keeping system features. The comparison suggests considerable advantages of the new solution versus previously considered options.

REPORT FROM THE TECHA RIVER DOSIMETRY REVIEW WORKSHOP HELD ON 8???10 DECEMBER 2003 AT THE STATE RESEARCH CENTRE INSTITUTE OF BIOPHYSICS, MOSCOW, RUSSIA

2006 ◽  
Vol 90 (2) ◽  
pp. 97-113 ◽  
Author(s):  
Mikhail Balonov ◽  
Rudolf Alexakhin ◽  
Andr?? Bouville ◽  
Jan-Olov Liljinzin
Keyword(s):  
The State ◽  
Research Centre ◽  
Techa River ◽  
State Research

scholarly journals Physical modeling of ice load on extended hydraulic constructions. The vertical wall constructions

2020 ◽  
pp. 77-89
Author(s):  
A.A. Dobrodeev ◽  
◽  
K.E. Sazonov ◽  
Keyword(s):  
Mathematical Models ◽  
Physical Modeling ◽  
Model Experiment ◽  
Vertical Wall ◽  
Research Centre ◽  
Federal State ◽  
Federal State Unitary Enterprise ◽  
Regulatory Documents ◽  
Ice Load ◽  
State Research

The authors present the results of studies carried out in the laboratory “Ice tank” of the Federal State Unitary Enterprise “Krylov State Research Centre”, related to the study of the ice effect on extended hydraulic constructions with a vertical wall. They analyze the possibilities of applying the method of physical modeling to investigate the processes of ice-construction interaction in ice tank. The results make it possible to recommend the method of physical modeling as one of the main approaches for studying the interaction specifics of hydraulic constructions with ice. The data of the model experiment can help to construct mathematical models of ongoing processes, as well as to clarify the requirements of regulatory documents.

scholarly journals Preface

2022 ◽  
Vol 1215 (1) ◽  
pp. 011001
Keyword(s):  
Motion Control ◽  
Russian Federation ◽  
International Workshop ◽  
The State ◽  
Research Centre ◽  
Russian Academy Of Sciences ◽  
State Research ◽  
The Russian Federation ◽  
Academy Of Sciences

International Workshop NMC 2021 Navigation & Motion Control 20-24 September 2021, Russia The International Workshop “Navigation and Motion Control” (NMC) is organized by the State Research Centre of the Russian Federation – Concern CSRI Elektropribor, JSC, with participation of ITMO University and St. Petersburg Electrotechnical University. Also, the Workshop would not have been held without support of the Academy of Navigation and Motion Control and its President, Academician of the Russian Academy of Sciences (RAS) Vladimir G. Peshekhonov. List of Logo, Image, MEMBERS, The editors are available in this pdf.

Sign in / Sign up

Export Citation Format

Share Document