This paper describes the solution of the problem of the ship motions in regular waves in shallow water by means of the three-dimensional source technique. The unknown velocity potentials are represented with the help of the Green function of three-dimensional pulsating source. Results of the computations of surge, sway, heave, roll, pitch and yaw amplitudes for different depth parameter h/T are presented. Finally, the considerable influence of the shallow water effect on the amplitudes of different motion modes is graphically illustrated and discussed.

Stationary wave motion of an ideal non-compressible fluid in a domain limited by a free surface and an infinite cone with the vertex on a free surface is considered. Wave motion is caused by the bottom movement. The problem is set for the velocity potential within the framework of the linear dispersion theory. By means of integral transforms the solution of the problem is reduced to a functional equation which has a solution in the particular cases. In assumption of smallness of angle between liquid free surface and cone surface analytic solution of the problem which contains dependencies from inclination angle is made.

Nowadays there is a tendency to development of ever deeper oil and gas fields due to depletion of hydrocarbon reserves onshore. Thus lots of lifting operations have to be carried out during infrastructural development of such fields. The present work, on the basis of Fourier finite integral transformation method, gives solution to the problem of lifting loads from deep waters taking into consideration wave and dissipating processes in lifting ropes. To reduce forces additional shock-absorbing and damping devices are introduced into the system. The effect of these devices on maximum forces realized in the system during the process of load lifting is currently being analised.

Algorithm is given for development of underwater object outer architecture when design computer technologies are used based on hydrodynamic and hydroacoustic criteria for outline quality evaluation when prototype is not available. Methodology of primary design process of outline shape with choice of the qualifiers is described. Geometrical and mathematical models are developed on the basis of these qualifiers. These models assist in calculation of architectural surfaces being initial information in application programs of hydrodynamics and hydroacoustics, the main purpose is to solve variational design problems.

The theoretical and numerical research of body of revolution lengthening effect on required power, conditioned by its drag coefficient and drag area, at constant velocity and the constant efficient volume are represented.

Results of data processing of sea tests of bluff cables are described. Approximation of hydrodynamic functions of loading according to aerodynamic tests is specified and values of hydrodynamic factors for straight-line 3-strands and 6-strands steel cables according to tests in water are defined at critical angles of attack. For the cables bent in a stream the empirical formulas are received, allowing to define factors of normal resistance depending on a combination of set tow-parameters. According to tension and configuration of flexible cables in a stream it is offered then to estimate some characteristics of hydroelastic vibration.

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 are outlined. Situational approach is suggested to control the complicated underwater object in dynamically changing signal clutter situations.