Krylov State Research Center


Krylov State Research Center

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Krasnov I.P.,Krylov State Research Center
Proceedings of the International Conference Days on Diffraction, DD 2016 | Year: 2016

In this work, a problem of description of interaction of electromagnetic field with matter is studied. This problem is directly related to another problem of construction of energy-momentum tensor of electromagnetic field in a space filled with bodies of different matter. For both problems, an important role is played by a choice of method of electromagnetic field description, that is, a choice of field vectors amongst admissible pairs E and H, D and B, D and H, E and B. In the present paper, we show that a sum of electromagnetic forces applied to a body with matter and speed of changing electromagnetic momentum in a domain occupied by this body, and also a sum of works, performed by electromagnetic forces per unit time and speed of changing of electromagnetic energy in the same domain, filled with the body, take the values that do not depend on admissible pair of field vector used for description of process of interaction between matter and electromagnetic field. This leads to an opportunity to make use of sums mentioned above as main suitable characteristics of interaction between matter and electromagnetic field. © 2016 IEEE.

Zalipaev V.V.,Krylov State Research Center | Glybovski S.B.,Saint Petersburg State University of Information Technologies, Mechanics and Optics | Andreev A.Y.,Krylov State Research Center
IEEE Transactions on Antennas and Propagation | Year: 2017

High-frequency asymptotic electromagnetic field solution is described for a resonant antenna formed by two perfectly conducting circular disks. The double-disk resonator is excited by a vertical electric dipole located at the center of the cylindrical space between the two horizontal disks. The solution is valid for comparatively large disks (at least few wavelengths in diameter). At the same time, the separation of the disks can be arbitrary. The proposed analysis is similar to the uniform geometrical theory of diffraction and provides asymptotic formulas describing the radiated field in both the far-and near-field zones. However, the method is novel since it is based on the canonical problem of diffraction on an open end of a parallel-plate waveguide and therefore takes into account the presence of higher order guided modes travelling between the disks. The method allows calculation of the total radiated power, which has maxima at frequencies equal to real parts of resonator's complex eigenfrequencies. Obtained theoretical directivity patterns in a broad frequency range show good agreement with full-wave numerical simulation. © 2016 IEEE.

Sokolov A.,Krylov State Research Center
INTERNOISE 2014 - 43rd International Congress on Noise Control Engineering: Improving the World Through Noise Control | Year: 2014

One of the main hydraulic elements to reduce noise and vibration of pipelines is a rubber-cord hose, which consists of a composite shell and attachment flanges. Within the frames of a beam model dynamic behavior of pipeline elements is described with impedance matrix 14x14, which can be determined by calculation or experiment. In the current paper a theoretical beam model of fluid-filled hose is introduced, taking into account with orthotropic and viscoelastic properties of composite shell. Expressions for impedance matrix elements are presented in analytical form. Some elements are measured and good agreement between predicted and measured characteristics is shown.

Korableva M.S.,Krylov State Research Center
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2013

Methods of profit approach are referred to the methods most often used during evaluation and economic analysis of intangible assets, which are the design works of the ocean engineering facilities (OEF). Concerning general applicability of profit methods the analyst also should keep in mind that these methods can be adapted with reference to majority of categories or kinds of intangible assets. While methods of market driven approach and profit approach possess specific conditions of applicability to certain categories of intangible assets and intellectual property, the methods of profit approach as a whole can be used concerning practically all categories of these assets. This paper is devoted to application of profit approach for the cost estimation of the ocean engineering facilities design works. Example of the cost estimation for SPAR-platform design works by the method of discounting the costs saving of profit approach is performed in the paper. Copyright © 2013 by the International Society of Offshore and Polar Engineers (ISOPE).

Kryzhevich G.B.,Krylov State Research Center
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2016

A basic design of appliances for quick personal rescue from surface ice-resistant offshore structures (fixed and floating drilling rigs, drilling vessels) in case of fires or other emergency situations is proposed. The design provides increased personnel rescue operation speed from highup premises due to quicker lifeboat launch times. This design is also characterized by alleviating overstresses experienced by rescued personnel under lifeboat impacts against the ice, as well as reliability increase for quick escape appliances in fire and accident conditions. The appliance contains a braking system for decreasing the lifeboat launch speed along the lowering chute and shock absorbers for impact loading decrease. © Copyright 2016 by the International Society of Offshore and Polar Engineers (ISOPE).

Chirkova A.,Krylov State Research Center
2014 International Conference on Computer Technologies in Physical and Engineering Applications, ICCTPEA 2014 - Proceedings | Year: 2014

The article describes a method for simulating lightning electromagnetic field parameters (the electric and magnetic components) as random variables. Built their distribution laws taking into account various factors, such as type of lightning, its amperage, intensity of storm activity in different climatic regions, the distance to the lightning discharge. Implementation demonstrated in MATLAB. Formulated the direction of future research in this area. © 2014 IEEE.

Valdman N.A.,Krylov State Research Center
Proceedings of the International Offshore and Polar Engineering Conference | Year: 2014

The latest developments in the marine systems intended for processing & transportation of the liquid hydrocarbons are driven by the challenges of the Russian Arctic (Prirazlomnoye, Varandei-Sea) fields, offshore fields in coastal waters of Timan-Pechora province and Ob-Taz region, as well as the Northern Caspian Sea. In view of the unique technologies and equipment of marine transportation & technological systems (including transport vessels, platforms, berths, terminals), long life cycles, harsh operating environments (Barents Sea, Kara Sea, Sea of Okhotsk), considerable volumes of hydrocarbons to be processed, shipped and stored, the special risk assessment and safety analysis shall be comprehensive and address the full life cycle of these facilities. The paper presents the results of risk assessment and risk management analysis performed as part of the environmental impact studies of offshore processing and transportation systems designed for the shelf of the Arctic seas. Methodical approaches used for these purposes are analyzed the case which, case studies of technical solutions and management decisions are given. It should be noted that in spite of overall improvement in the safety levels of offshore operations achieved over the last 10-20 years, the major accidents are still frequent and the safety barriers for efficient risk management and control remain to be an urgent issue. Copyright © 2014 by the International Society of Offshore and Polar Engineers (ISOPE).

Krylov State Research Center | Date: 2016-09-14

The invention relates to shipbuilding, and more specifically - to the icebreakers and tugboats intended for operation in ice in shallow water conditions. The proposed invention is aimed to improve maneuverability of the ship running both ahead and astern in constrained environment in ice and in open water, as well as to improve its icegoing capabilities and to effectively handle air penetration to the operating AZT propellers and ship propulsors. For this purpose the icebreaker intended for operation preferably in shallow freezing waters comprising a hull with a sled-like stern overhang having flat bottom and ice protection shield along the perimeter of the overhang, and podded propulsion system disposed in the overhang and comprising two side propulsors mounted on the shafts symmetrically to the ships CL, and arranged with regard to hull height so that the propulsors tip edges do not protrude beyond the ships base plane and design waterline at the propellers location, and, according to the invention, is fitted with two 360-degree azimuth thrusters (AZT) equipped with pulling propellers mounted on the AZT shafts in front of their pods with blade tip edges not protruding beyond the base plane and arranged symmetrically to the ships CL displaced sternward in such a way that the distance between the disks of AZT propellers and disks of side propulsors is not greater than the diameter of propulsor and the 360-degree turn of azimuth thruster about its axes with no contact to ships propulsors is provided. In DWL area, the ships stern overhang is of wedge-type icebreaking shape with 90 - 180 wedge angle along the DWL with its surface being inclined at no less than 30 to the vertical. An ice protection shield with wedge-shape cross section does not protrude beyond the ships hull and is formed so as to extend in the bow direction beyond the disks plane of ships side propulsors by the value not greater than two diameters of the above-mentioned propulsors; moreover, it has height at which the lower edge of the shield in the stern protrudes upwards from the rotation axes of AZT propellers at least by half the radius of these propellers. The proposed ship intended for operation in shallow freezing water offers improved maneuverability and icegoing capabilities comparing preferably with prototype.

Krasnov I.P.,Krylov State Research Center
Proceedings of the International Conference Days on Diffraction 2014, DD 2014 | Year: 2015

The paper demonstrates that transition from electric displacement vector D to its solenoid equivalent D• allows constructing dual pair for vector and scalar electromagnetic potentials. Each pair of electromagnetic potentials representing 4-vector in Minkowsky space may be determined by 4-divergence of its antisymmetric tensor with Hertz vectors components, and these tensors are mutually conjugated. This simplifies representations in Minkowsky space of Maxwell equations solutions, Lagrange functions and energy and momentum conservation law and thus enhances description of electromagnetic processes in a matter. © 2014 IEEE.

Krylov State Research Center | Date: 2016-04-27

The invention relates to field of shipbuilding and, more specifically, to seagoing bunkering vessels intended for bunkering seagoing ships and refers to the issues of liquefied natural gas transportation and serves the purpose improve economic efficiency of the bunker barge vessel by elimination of gas vaporing in the containers and its processing, shortening the process of pressurized LNG transfer during ship bunkering, reducing gas losses at LNG loading and delivery to the bunker vessel due to significant reduction of intermediate cargo operations during LNG loading and delivery to the bunkered ship. For this purpose the tug/bunker barge combination comprised of the specialized barge articulated to the tug by means of coupling device is equipped with liquefied natural gas containers located on the barge and the cargo system for integrating the said containers into a single installation for LNG storage and dispensing for ship bunkering, wherein according to the invention the LNG containers are made in the form of tanks mounted on the wheeled chassis, which are rolled onto a barge, and then sea fastened on the barge, and connected to the barge cargo system, the barge being fitted with a facility for rolling on the tanks. Furthermore, the barge deck is adapted to allow traveling of wheeled vehicles. Moreover, the facility for rolling the tanks onto the barge is made in the form of a ramp or bridge located outside of the barge. In this case the barge deck has thermal insulation coating aimed to prevent any damage to the deck by accidental spills of liquefied natural gas.

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