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Diffraction of sound pulses on a spherical target in an oceanic waveguide covered with ice

Grigorieva N., Kupriyanov M., Ostrovskiy D., Stepanova D.

Hydroacoustics

2016

Vol. 19

139--144

This paper is devoted to modeling of the pulse scattering by a spherical target immersed in a homogeneous waveguide covered with ice. For calculating the echo signal in the frequency domain we have followed Hackman and Sammelmann’s general approach. The arising scattering coefficients of a sphere were evaluated with the use of the normal mode method. The amount of normal modes forming the backscattered field is determined by the given directivity of the source. The emitted signal is a pulse with a Gaussian envelope. Computational results are obtained in a wide frequency range 8 - 12 kHz for water depths equal to several hundreds of m, and distances between the source/receiver and a target from 1 km up to 10 km. The target is assumed to be acoustically rigid or fluid. In particular, the properties of the ice cover and a scatterer may coincide.

Designing of technological assembly modules

Grigorieva N.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2010

z. 80 [274]

97-102

The features of construction a modular assembly technology, shaping of modules, designing assembly of technological processes are described. The optimizations approaches for reach of practical construction of modules are shown on a criterion of an amount executed assembly movements.

Simulation of automatic assembly lammellate magnetic circuit

Grigorieva N., Velichco L., Sorochak O., Szabajkowicz W.

Zeszyty Naukowe Politechniki Rzeszowskiej. Mechanika

2002

z. 58 [193]

85-89

The dynamic model of formation lamellar magnetic conductor by an expedient of stage compression is circumscribed. The demanded forces of a direct extrusion and correcting final squeezing of assembled packages having high profile at projection of technological assembly equipment are defined.