НИЦ "Моринтех"

THE INVESTIGATION OF THE INFLUENCE OF NONLINEAR FORCES ON THE AMPLITUDES OF THE SHIP MOTIONS ON QUARTERING WAVES IN THE SHALLOW WATER

Semenova V. Yu., Soe Kyaw Thu
Saint-Petersburg state marine technical university

tel.: 8-905-229-71-98
e-mail: sem_viktoria @mail.ru
This article examines the two-dimensional nonlinear potential problem about  motions of the ship in finite-depth water on quartering waves. Second-order amplitudes of swaying, heaving, rolling, pitching and yawing  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 different motions  is given. The considerable influence of nonlinear forces  in the areas of superharmonic resonances of heav  roll and pitch modes of  ship motions generated by the decrease of depth  is shown.
Key words: motions of the ship, perturbation theory, shallow water, nonlinear second-order forces, superharmonic resonances, second-order amplitudes.

DEVELOPMENT OF MARINE INTELLECTUAL TECHNOLOGIES IN KOMSOMOLSK-NA-AMURE STATE TECHNICAL UNIVERSITY

Nechaev Yu. I., Burakovskiy P. E.
Kaliningrad state technical university

tel.: 8-4012-36-43-38
e-mail: paul_b@mail.ru
The problem of developing and using fractal grapho-analytical system at controlling operational strength of fishing vessels on the basis of modern catastrophe theory is discussed. Main attention is given to analysis and interpreting emergency situations on the basis of graph structures and reflections in the form of temporal rows.
Key words: grapho-analytical system, operational strength, emergency situations, fractal reflections, Fibonacci tree.

GRAPHO-ANALYTICAL CONTROL SYSTEM OF OPERATIONAL VESSELS STRENGTH OF FISHING FLEET ON THE BASIS OF MODERN CATASTROPHE THEORY METHODS

Burakovskiy E. P., Nechaev Yu. I.,
Burakovskiy P. E., Prokhnich V. P.
Kaliningrad state technical university

tel.: 8-4012-36-43-38
e-mail: e_burakovsky@mail.ru
Realization of conceptual solutions of grapho-analytical system at developing intelligent technologies for taking decisions in control system of operational strength for fishing vessels is discussed. Main attention is given to formalizing problem on the basis of modern catastrophe theory. System architecture and its functional modules oriented at information processing in multiprocessing computation medium is given. Intelligent system is set up within framework of service distribution architecture on the basis of cognitive paradigm and synergetic control theory.
Keywords: grapho-analytical system, operational strength, catastrophe theory, service distribution architecture, cognitive model, synergetic paradigm.

CONTROL OF THE POSITION OF THE FLAT SECTIONS IN THE SPACE OF SHIPS BY MEANS TACHEOMETER 3Та5Р6

Nguyen Trung Anh, Lubenko V. N.
Astrakhan State Technical University

tel.: (8512) 614-190
e-mail: astrakhan.nta58@gmail.com
The article discusses issues related to the practical application of tacheometers in shipbuilding. Depending on the measurement process of tacheometer (method of determining the basic coordinate system and object coordinate system for flat sections of the ship and the principle of recalculation between them) control methods are set up to inspect the positions of the flat  sections of  the ship in space. Because of this principle, a prospect of  software creation is being opened in order to reduce labour intensity  during execution of control measurements in shipbuilding.
Key words: shipbuilding, measurement, tacheometer 3Ta5P6, basic coordinate system, object coordinate system, recalculation.

THE EXTRAPOLATION ALGORITHM OF PREDICTION MODERNIZATION

Ravin A. A., Hruzkij O. V.
Saint-Petersburg state marine technical university

el.: (812) 743-82-97
e-mail: ravinlki@mail.ru
Two methods for modernization of one-parameter extrapolation algorithm of prediction for exploitation degradation of equipment operating conditions are considered. The algorithm modernization allows to take into account the equipment operation mode changes during the diagnosis parameter monitoring.
Key words: ship equipment, monitoring, extrapolation, trend, linearization of residual resource forecast.

METHOD OF GREEN’S FUNCTIONS FOR THE PROBLEM OF SOUND DIFFRACTION ON BODIES OF NON-ANALYTICAL FORM

Ilmenkov S. L.
Saint-Petersburg state marine technical university

e-mail: ilms@rambler.ru
The real scatterers have a non–analytical form and, therefore, the variable separation method (Fourier series method) for calculation of the reflected sound field cannot be applied to them. This article presents the method of Green’s functions for the solution of the problem of sound diffraction on bodies of a non–analytical surface. Furthermore, this work includes the detailed analysis of the solution of this problem and calculation of the angular characteristics of the sound scattering by non-analytical scatterers.
Key words diffraction, method of Green’s functions, non–analytical surface, boundary conditions.

ACOUSTIC ACCOUNT OF PHASE VELOCITIES OF WAVES IN DESIGNS USED ON TRANSPORT

Ilmenkov S. L.
Saint-Petersburg state marine technical university

e-mail: ilms@rambler.ru
In the first part of the article on the basis of the reciprocity theorem are studied internal (for a cylindrical tunnel) and external (for a spheroidal shell) tasks of radiation of a sound by the elastic bodies, exciting by the harmonic point source, imitating turbulent pulsation of a flow of a liquid. The angular characteristics of radiation of a hollow spheroidal shell at the various wave sizes and at the various situations of a source are calculated.
In the second part of the article the characteristic equations of the axial three-dimensional flexural waves in the hollow cylindrical shell and cylindrical bar are received with the help of Debye’s potentials. The phase velocities of the various forms of these waves for steel and aluminium shells of various thickness and for cylindrical bar are calculated.
Key words: cylindrical and spheroidal shells, turbulent pulsations, boundary conditions, phase velocities of the elastic waves, the angular characteristics of radiation.

RESONANCE SENSIBILITY OF THE DYNAMIC HOPF BIFURCATIONS IN THE EVOLUTION OF NON-STATIONARY OBJECT IN COMPLEX DYNAMIC ENVIRONMENT

Nechaev Yu. I., Petrov O. N.
Saint-Petersburg state marine technical university

tel.: (812) 369-63-37
e-mail: nechaev@ifmo.mail.ru
tel.: (812) 430-79-88
e-mail: petr_oleg@mail.ru

The paper is devoted to the research results of maritime objects dynamics on the basis of modern catastrophe theory in on-board intelligence systems of new generations. It is shown that periodic forced effect can be described by trajectories surrounding Hopf bifurcation. The resulting sensitivity law is similar to the cusp catastrophe behavior. The similarity with the static bifurcation allows using standard diagrams and formulas to the dynamic bifurcation.
Key words: modern catastrophe theory, chaotic dynamics, strange attractor, intelligence system, extreme situations, non-stationary processes.

CHAOTIC DYNAMICS OF STRANGE ATTRACTOR IN THE EVOLUTION OF NON-STATIONARY OBJECT IN COMPLEX DYNAMIC ENVIRONMENT

Nechaev Yu. I., Petrov O. N.
Saint-Petersburg state marine technical university

tel.: (812) 369-63-37
e-mail: nechaev@ifmo.mail.ru
tel.: (812) 430-79-88
e-mail: petr_oleg@mail.ru
The paper is devoted to the research results of chaotic dynamics of non-stationary object in complex dynamic environment. An analysis is carried out on the basis of modern catastrophe theory applied to on-board intelligence systems of new generations. It is shown that system dynamics can be described by trajectories surrounding strange attractor in the evolution of the system under the influence of external disturbance. An algorithm monitoring emergency ship dynamics on waves is based on the results of the analysis.
Key words: modern catastrophe theory, chaotic dynamics, strange attractor, intelligence system, extreme situations, non-stationary processes.