Saint Petersburg, Russia
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Krasnov I.P.,Krylov Shipbuilding Research Institute
Proceedings of the International Conference Days on Diffraction, DD 2012 | Year: 2012

The concept of electromagnetic field sources consists in consideration of specific function of such values as electrical current density j, polarization P and magnetization J in classical electrodynamics and application thereof for definition and solution development of electrodynamics' problems. Specific function of j, P and J values is associated with the fact that being characteristics of the substance these values may be considered also as sources or origin of electromagnetic field generated by a body within the volume of which they are specified. Representations of Maxwell equations in the form of integrals from values j, P and J over V domain where they are specified as functions of point x V and time t (-∞,∞), obtained in this work, are demonstrative validation of this statement. © 2012 IEEE.


Khalikova D.F.,Krylov Shipbuilding Research Institute
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2012

The paper stresses the ambiguity of architectural type (AT) of floating craft for exploration drilling in shallow water conditions, as well as the necessity of using the methods of multicriterion evaluation for choosing the most rational AT. The recommended methodology is the expert judgments with determination of priority number of criteria, their ranking and calculation of versatility indicator. The results of methodology validation are shown - the selection of rational AT for floating drilling unit (FDU) to be operated in shallow water sites - shallow-draft jack-up floating drilling unit (SDJUFDU). The algorithm for determining the main dimensions of the SDJUFDU with regard to its operational features in distinctly various conditions (as floating object, fixed offshore structure, and transitional mode - leg penetration into soil during installation at site) is presented. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).


Belov I.M.,Krylov Shipbuilding Research Institute | Spiridonov N.N.,Krylov Shipbuilding Research Institute
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2012

The results of investigations of vibration for perspective icebreakers and ice-going ships operating in difficult climatic conditions are presented. These investigations were performed to reduce the vibration of such category of ships to acceptable levels providing vibrational strength, fail-safe exploitation of equipment and normal inhabitation conditions for crew. The features of vibration recorded on icebreakers and ice-going ships and reasons of its amplification are analyzed. The main aspects of calculation algorithms and experimental estimation methods of forces inducing hull vibration in ice operation mode are discussed. The methods of estimation and reducing hull vibration and vibrational action on crew are proposed. New approaches to ice vibrational normalization are proposed. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).


Korableva M.S.,Krylov Shipbuilding Research Institute
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2012

Design of ocean engineering facilities (OEF) plays a major role in Russian Continental Shelf development. Development of science and technology poses increasingly difficult and intensive challenges for design engineers of these facilities, which require high level of design solutions and more efficient project management. Therefore, OEF design management issues are gaining a special urgency. One of the problems related to OEF design management in Russian Federation today is lack of cost estimation methods to implement. More commonly, a facility construction cost forms the basis for design cost estimation today. This article contains the results of analysis of current methods for evaluation and forecasting of design labour intensity, as well as methods for cost estimation of design in shipbuilding and related industries. It also includes statistic data of OEF design costs. Various approaches for cost estimation and pricing methods for design works of ocean engineering structures are presented in the article and the selection problem for the best approach to estimate the OEF design costs is considered. Copyright © 2012 by the International Society of Offshore and Polar Engineers (ISOPE).


Krasnov I.P.,Krylov Shipbuilding Research Institute
Proceedings of the International Conference Days on Diffraction, DD 2012 | Year: 2012

Calculated value of force acting on a body participating in electromagnetic process depends on selection of pair of vectors used for description of electromagnetic field. Analysis of possible representation of Pointing formula reveals that during description of field/substance interaction, assumed in classical electrodynamics, application of E and H pair only enables identification of total electromagnetic energy satisfying conformity principle to the known processes in plane wave, and to the free energy - in statics. Derivation of London brothers equation of superconductivity theory is presented as an example of application of total energy concept. © 2012 IEEE.


Palii O.M.,Krylov Shipbuilding Research Institute
Mechanics of Solids | Year: 2014

A version of an applied theory of shells of large thickness based on the introduction of force and kinematic hypotheses completing and extending the set of Love-Kirchhoff and Timoshenko-Reissner hypotheses is discussed. The complete system of equations including the elasticity relations, the geometric relations (displacements and strains), and the equilibrium equations is written out. The obtained system of equations is verified in several special cases. It is noted that the error of this theory does not exceed the squared thickness-to-radius ratio compared with unity. © 2014 Allerton Press, Inc.


Popkov V.I.,Krylov Shipbuilding Research Institute
Acta Acustica united with Acustica | Year: 2012

This paper examines physical and mathematical model describing the oscillations of the flexible insert with fluid. It also provides methods and instrumentation layouts to measure acoustic impedances, mechanical impedances in relation to forces and moments, acoustic and mechanical and mechanical and acoustical impedances of the flexible inserts with fluid. © 2012 S. Hirzel Verlag GmbH & Co.


Krasnov I.P.,Krylov Shipbuilding Research Institute
Proceedings of the International Conference Days on Diffraction 2011, DD 2011 | Year: 2011

It is considered the problem of force interaction of electromagnetic field and substance in form of space-fixed solid bodies of uniform density. The problem is solved on the base of examining such integrals of Maxwell's equations as momentum and energy of electromagnetic field. General Maxwell's equations allow four versions of them that connected with the choice of the pair of vectors of the field among four pairs: E and H, D and B, E and B, D and H. Each version have own form of momentum and energy and own expression for the force, acting on the bodies. In static, all representations of those forces are equivalent, while in dynamics there is a difference between them, although for periodic electromagnetic processes the equivalency of all representations of the forces is average for the period. The forms of momentum and energy may be used for determination of the tensor of energy and momentum, including Abraham's tensor and Minkovsky's tensor. © 2011 IEEE.


Karulin E.B.,Krylov Shipbuilding Research Institute | Karulina M.M.,Krylov Shipbuilding Research Institute
Ships and Offshore Structures | Year: 2011

The behaviour of a tanker moored to a point terminal under a change of ice drift direction has been investigated. One end of the mooring line is fastened to the point terminal and the other one to the mooring device on the vessel's bow. The tanker's motion in drifting broken ice is described by equations of motion, and its behaviour is determined by the balance of the environmental forces (ice, aerodynamic and hydrodynamic) acting on the vessel, as well as of the tighting force of the mooring line, of thrusters' forces and of inertial forces. For the ice loads determination, the discrete element method is applied: the broken ice is represented by a set of floating disks interacting with each other as viscous-elastic bodies. The results of numerical calculations have been compared with experimental data of analogous model tests performed in an ice tank. It is shown that the developed numerical model may be used for theoretical analysis of behaviour of a moored tanker in drifting ice. © 2011 Taylor & Francis.


Karulin E.B.,Krylov Shipbuilding Research Institute | Karulina M.M.,Krylov Shipbuilding Research Institute
Proceedings of the 9th (2010) ISOPE Pacific/Asia Offshore Mechanics Symposium, PACOMS-2010 | Year: 2010

The paper presents results of theoretical and experimental investigations into performance of technological complex platform "Prirazlomnaya" - moored tanker in broken/managed ice conditions. The theoretical approach is based on numerical simulation of interaction of various objects - icegoing ships, fixed and moored offshore structures - with broken ice using discrete element model (DEM). The presented model describes dynamic behaviour of a tanker moored to a fixed offshore structure of "Prirazlomnaya" type. On basis of analysis of hydrometeorological data in Pechora Sea scenarios of action of external forces (ice, wind, current) on the system platform-tanker are considered. Peculiarities of dynamic behaviour of the ship due to ice drift direction change under action of wind and current have been studied. The paper contains description of model tests on interaction of the technological complex with ice that were performed in the Ice Basin of KSRI, St.Petersburg. Both numerical and physical simulations of the system behaviour under external force action were performed taking into account real values of the mooring hawser stiffness. Copyright © 2010 by The International Society of Offshore and Polar Engineers.

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