МИТ № 2 2013

PROJECT COMPARISONS OF THE SUPPLY VESSELS HULL SHAPE FROM POINT OF SEAWORHINESS LEVEL VIEW

Dobrynin A. Y., Khanukhov V. K., Tsarev B. A.
Saint-Petersburg State Marine
Technical University
e-mail: dobrynin.artyom@gmail.com
e-mail: vitos2988@ya.ru
tel.: (812) 494-09-69
In the result of shape hull comparison of supply vessels from point of level seaworthiness view in heavy weather conditions is detected the advantages of new shapes offered by the russian and norwegian experts. It is shown that such shapes provide all kinds of selfstabilization. Slight loss of speed in calm water for supply vessels doesn’t play a significant role.
Key words: ship design, naval architecture, seaworthiness, vessels shape, rolling selfstabilization.

ABOUT MATHEMATICAL MODELLING FISHING VESSELS OF WET – TYPE FOR VIETNAM

Ngo Duc Thang
Baltic State Academy of Fishing Fleet: «Kaliningrad Stade Technical University»

e-mail: banlinh84@yahoo.com
tel.: 8-(4012)-96-60-95
In article features of the mathematical models developed for fishing vessels of wet – type are considered. Results of the series of the optimization researches realized with use of these models, allow to concretize features of purpose of fishing vessels of Vietnam for development of the removed areas of its coastal fishery.
Key words: fishing vessels of wet – type, mathematical modelling, the technical and economic analysis, the conception of a vessel.

A STUDY OF VERTICAL SUBMERSION OF A VEHICLE, EQUIPPED WITH BOUYANCY ENGINE WITH ACCOUNT OF WATER DENSITY PROFILE AND HULL COMPRESSION

Rozhdestvensky K. V., Ryzhov V. A.,
Tkachenko I. V., Frumen A. I.
Saint-Petersburg State Marine
Technical University
e-mail: kvrxmas@yahoo.com
tel.: +7812 7142923
This paper uses a simplified mathematical model to investigate the influence of water density profile and hull compression on vertical submersion of a vehicle. A possibility  and conditions are revealed for realization and stability of “hanging” modes of the vehicle. Presented are calculated data, characterizing the influence of water density profile, configuration and material of the hull on submersion and its rate versus time. Conditions are determined for submersion with constant speed   and the formulae are obtained  for compensational buoyancy control and estimation of the required reserve of buoyancy and energy expenditure.
Key words: submersion of a vehicle, density of water, compression of hull, expenditure of energy, control of buoyancy, buoyancy engines, underwater gliders.

THE CALCULATION OF THE  NONLINEAR TRANSVERSE SHIP MOTIONS IN THE SHALLOW WATER

Semenova V. Yu., So Hgo Tu
Saint-Petersburg State Marine
Technical University
e-mail: sem_viktoria@mail.ru
tel.: (812) 682-17-46
This article examines the two-dimensional nonlinear potential problem about transverse motions of the ship in finite-depth water. Second-order amplitudes of swaying, heaving and rolling of a ship are determined. Those amplitudes are generated by the influence of nonlinear forces of second-order acting on different ships. The investigation of the influence of the alteration of water-depht on the amplitudes of transverse motions is given. The considerable influence of nonlinear forces  in the areas of superharmonic resonances of heav and roll modes of ship motions generated by the decrease of depth is shown.
Key words: transverse motions, perturbation theory ,shallow water, nonlinear second-order forces, superharmonic resonances, second-order amplitudes.

ESTIMATION OF ACCURACY OF THE METHOD OF BOUNDARY ELEMENTS IN MATHEMATICAL MODELING OF THE FLOW OF THE BYPASS GATEWAY GALLERIES

Vasin A. V., Timofeeva O. A.
State University of Maritime and Inland Shipping
tel.: (911) 749-09-38
e-mail: andrejvasin@gmail.com
The purpose of this paper is to analyze and evaluate the accuracy of the boundary element method, used for coupling eddy flows. Accuracy is checked by comparison with the numerical procedure with the analytical solution for the Rankin vortex. This work has direct application to the study of dynamic loads on hydraulic locks for different modes of operation of the last ones.
Key words: the Dirichlet problem, the constant vorticity flow.

COMPUTATION TECHNOLOGY FOR REALIZATION OF MODERN CATASTROPHE THEORY IN THE INTELLECTUAL CONTROL SYSTEM OF OPERATIONAL VESSEL STRENGTH

Burakovskiy E. P., Nechaev Y. I.
Burakovskiy P. E., Prokhnich V. P.
Kaliningrad State Technical University
e-mail: e_burakovsky@mail.ru
tel.: 8-4012-36-43-38
A computation paradigm at modeling extreme situations aboard intellectual control systems of marine vessels’ strength is discussed. Special attention is paid to solving problem of complexity and adequacy of mathematical models in condition of uncertainty and insufficiency of initial information.
Key words: computer mathematics, catastrophe theory, operational strength.

COMPLEX ONTOLOGY AT KNOWLEDGE FORMALIZING OF INTELLECTUAL CONTROL SYSTEM OF OPERATIONAL VESSEL STRENGTH

Burakovskiy P. E., Nechaev Y. I.
Kaliningrad State Technical University
e-mail: e_burakovsky@mail.ru
tel.: 8-4012-36-43-38
Metaontology problems in dynamic structure of intellectual control systems of vessels’ strength are discussed. Information model provides ontology construction in complex dynamic media. Interconnection among ontologies of information model is presented in the solution derivation form. A formal model and hierarchical ontology structure are discussed within the framework of information procession paradigm in a multiprocessor computation medium.
Key words: intellectual system, criteria basis, vessel dynamics, decision making, catastrophe theory.

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