scholarly journals Transactions of the Krylov State Research Centre

2020 ◽  
Keyword(s):  
Research Centre ◽  
State Research

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.

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).

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

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.

Application of Special-Purpose Equipment for Management of Ice Buildups Around Prirazlomnaya Platform

2018 ◽  
Author(s):  
Evgeny Karulin ◽  
Marina Karulina ◽  
Mikhail Kazantsev ◽  
Aleksander Proniashkin ◽  
Dmitry Zaikin
Keyword(s):  
Service Life ◽  
Operating Conditions ◽  
Research Centre ◽  
State Research ◽  
Actual Operating ◽  
Ice Drift ◽  
Management Techniques ◽  
Management Method ◽  
Winter Time ◽  
And Behavior

From experience, OIRFP Prirazlomnaya (offshore ice-resistant fixed platform) installed in the Pechora Sea was seen to accumulate sustained piles of rubble ice in winter time. These features were formed along the platform walls and rested on the seabed (berm) obstructing operation of supply ships and crew evacuation. Researchers from the Krylov State Research Centre, St. Petersburg, were studying the ice piling processes and behavior under variation of environmental conditions (e.g., changes in ice drift headings) during design as well as service life of the platform. Moreover, the Krylov Centre ice basin was engaged in development of various ice management techniques to reduce the ice buildup as well as to remove rubble ice piles. The results of these investigations, which are presented in the paper, have led to a relatively simple solution for removing the rubble ice piles with a special-purpose shovel (excavator) mounted on the deck of a supply vessel. The paper describes details of the suggested solution and its implementation. The efficiency of this ice pileup management method has been proven in actual operating conditions.

Ice Propulsion Performance Calculation As per Alternative System of Propeller-Hull Interaction Coefficients

2018 ◽  
Author(s):  
G. I. Kanevskii ◽  
A. M. Klubnichkin ◽  
K. Ye. Sazonov
Keyword(s):  
Measurement Data ◽  
Full Scale ◽  
Research Centre ◽  
Interaction Coefficients ◽  
Propulsion Performance ◽  
State Research ◽  
Alternative System ◽  
Ice Field ◽  
Performance Calculation ◽  
Ice Resistance

Propulsion performance of icebreakers cannot be calculated as per the classic system of propeller-hull interaction coefficients due to high negative values of wake fractions. To overcome this difficulty, this paper applies an alternative system of propeller-hull interaction coefficients. This system consists of thrust deduction fraction, coefficient of hull effect upon thrust and coefficient of hull effect upon torque. The method suggested in this paper was used to analysis the data of ice trials for Vladivostok and Novorossiysk icebreakers. The input data in this analysis are speed in the ice field and required power. The sought values are propeller rotations per minute (RPM) and ice resistance. Propeller RPM values are compared versus the results of full-scale ice trials. Ice resistance values are compared versus the predictions based on the model test data obtained in ice basin of Krylov State Research Centre (KSRC). It is shown that at low speeds in the ice field (0.5–5.0 knots), calculated propeller RPMs have good correlation with the full-scale measurement data. This paper also gives propulsion performance calculation for Vladivostok icebreaker in 1.5-m thick ice field.

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