НИЦ "Моринтех"

Ecological aspects of providing safety by the underwater extraction of oil and natural gas

Miloslavskaya S. V.
State Marine Technical University of St. Petersburg
e-mail: svetlana-mil@mail.ru
tel.: (904) 636-04-34

The report about questions of providing ecological safety by the underwater extraction of oil and natural gas. Actions for elimination of consequences of emergency oil spill and possibility of application of information-measuring technologies of control of a state of environment are considered.

Key words: ecological safety, guard of the environment, elimination of oil spill.

Sea transportation of natural gas in the compressed form

Rumin S. N.
State Marine Technical University of St. Petersburg
tel.: (812) 713-71-36;
e-mail: rumin@gmx.net

The following report presents basic concepts and maintenance methods of hydroacoustic compatibility of dissimilar systems and tools that are placed on one carrier and are functionally united to solve various problems. Situational approach is suggested to control the complicated underwater object in dynamically changing signal clutter situations.

Key words: hydroacoustic compatibility, complex application, situated management, signal clutter situation.

Decrease of external force effects on fast catamaran structures through rationalization of its architectural configuration

Kryzhevich G. B.
Federal State Unitary Enterprise «Shipbuilding Research Institute. Acad. Krylov»
tel.: (905)214-03-61

A series of the following new technologies for decrease of external force effects on fast catamarans under seas is proposed:
– decrease of vertical clearance in the catamaran stern;
– installation of wedge-shaped housings in the cross-structure bow;
– forming a special groove in hulls’ bow to open the slamming zone from the sides in the cross-structure bow and provide more free liquid outflow from the cross-structure – waves impact interaction area;
– installation of a foil system in the catamaran bow;
– decrease of the cross-structure relative length.
Based on the results of experimental and analytical evaluations, it was concluded that such structural measures are effective for decreasing loads on the structures and additional water resistance to ship operation, as well as for increasing indexes of reliability, life, materials consumption and convenience of fast catamarans.

Key words: fast catamaran, external force.

Decrease of loads on planing boat structures with the help of compliant steps

Kryzhevich G. B.
Federal State Unitary Enterprise «Shipbuilding Research Institute. Acad. Krylov»
tel.: (905)214-03-61

Technologies for increase of compliance of planing boat step structures are proposed. External forces on the step and the whole boat, as well as water resistance to boat operation in waves are decreased with the help of these structures. Structural solutions are given, which provide installation of bow water inlet valves and aft discharge nozzles on steps to promote additional improvement of boat performance in conditions of step impacts against head seas. Effectiveness of the proposed structural modifications for decreasing the external force effects is evaluated.

Key words: planing boat, step structures, external force, vessel vibration.

Methods and models of modern catastrophe theory in the evaluation of sea ship safety

Nechaev Y. I.
State Marine Technical University of St. Petersburg
e-mail: nechaev@mail.ifmo.mail.ru
tel.: (812) 337-64-94

The paper is devoted to a problem of creating a catastrophe model for nonlinear non-stationary system analysis in the conditions of continuous changes of ship and environment dynamics. Reconstruction of catastrophe model subject to achievements of classical theory and methods of information handling in multiprocessor computing environment gain special attention.

Key words: nonlinear system, decision-making, catastrophe theory.

An analysis of injured ship dynamics on the basis of catastrophe theory methods

Petrov O. N.
State Marine Technical University of St. Petersburg
tel.: (812) 430-79-88
e-mail: petr_oleg@mail.ru

The paper is devoted to modeling results of injured ship dynamics on irregular waves. The analysis is performed on the basis of catastrophe theory. Examples of application of developed algorithm during the extreme situations monitoring are considered.

Key words: injured ship dynamics, intelligence system, catastrophe theory, modeling, decision-making.

The propeller electrical  drivers with a permanent magnet motors

Kalmikov A. N.,
State Marine Technical University of St. Petersburg
Michailov V. M.,
CJSC «REP Holding»
Senkov A. A.,
«Central Design Bureau for Marine Engineering «Rubin»
e-mail: kan@smtu.ru
tel.: (812) 714-68-39

The features of the propeller electrical  drivers with a permanent magnet motors are indicated. The construction of the motors with a radial – axial magnetic flux (Transverse Flux Motors) is analyzed.

Key words: propeller electrical  drivers, permanent magnet motors, radial-axial magnetic flux.

Definition of area of possible start of the idle steam-and-water jet device in case of two in parallel working devices

Shamanov N. P., Andreev A. G.
State Marine Technical University of St. Petersburg

Conditions of start of the steam-and-water jet device in the first contour nuclear steamed unit with the help bypass pipes are formulated. The concept of area of start is given. Boundary conditions at which performance there is a device start are defined. Results of calculations are graphically presented. Features of start of steam-and-water jet devices in case of two in parallel working devices are investigated.

Key words: nuclear steamed unit, the steam-and-water jet device, area of possible start.

Numerical model on a ship’s motion in confined water for ship training simulator

Nikushchenko D. V., Chetvertakov A. M.
State Marine Technical University of St. Petersburg
e-mail: ndmitry@list.ru
e-mail: chetvertakov.aleksey@mail.ru
tel.: +7(812) 4950227

The paper contains results of a numerical simulation of maneuvering of a ship in restricted waters. Main goals of the research presented were development of method of forces and moments prediction and elaboration of criterions of maneuverability of a ship. Results of numerical computations were presented and compared with results of experimental measurements. There were made regression analysis to find dependences allow taking into consideration additional forces and moments appeared on ship’s hull while maneuvering nearby banks. With the help of these formulas additional forces and moments for several ships were calculated. There were several simulations in training simulator “Polaris” to validate the formulas.

Key words: manoeuvrability, ship handling, mathematical simulation, computational fluid dynamics..

MULTI-HULL HIGH-SPEED SHIPS OF LITTORAL ZONE

Lyakhovitsky A. G.
State Marine Technical University of St. Petersburg

The peculiarities of multi-hull high-speed ships are outline. The development and state-of- the-art of multi-hull high-speed ships analyse. The multi-hull littoral ships realize progressive and innovative decision in the shipbuilding.

Key words: multi-hull ship, speed, littoral, design, innovation.

Influence of the dispersion on thermodynamics of boundary layer

Prozorov E. V.
State University of St. Petersburg

e-mail: prozorova@niimm.spbu.ru
The contribution of angular momentum and cross flows in elementary volume are discussed for continuous mechanics. For continuous mechanics formulation of equilibrium of angular momentum conditions are suggested. At present formulation of equilibrium force conditions are used. These give us symmetric pressure tensor and disturbance of continuous medium. The boundary conditions are made more accurate for rarefied gas and for transition flow regime.

New method of solution problem of stream round the body is suggested. Conditions of the existence of A.N. Kolmogorov inertia interval is established.

Key words: conservation laws, equations of a theory of elastic strength, moment of momentum, Novie-Stokes, Boltsman.

Analysis of OSCILLations of Constructions with CollapsE ReLATIONs

Potapov A. N.
South-Ural State University
e-mail: admin@susu.ac.ru
The analysis of oscillations in discrete dissipative systems at collapse relations (connections) was realized. The analytical forms of parameters of the reaction were received. It is shown, what at the moment  of collapse connections a number of reaction parameters have discontinuities.

Key words: vibrations of constructions, deenergizing of connections, dynamic reactions, dissipative systems.