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Registration Number

0205U006719, 0103U000048 , R & D reports

Title

Investigation of laws of generation and propagation of sound in the elastic-liquid systems

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Head

Grynchenko V. T.,

Registration Date

14-12-2005

Organization

The Institute of Hydromechanics of the National Academy of Sciences of Ukraine

Description

Data concerning properties of normal waves in a compound elastic-liquid cylindrical waveguide are presented. The dispersion properties of normal waves are determined on basis of the dispersion equation analysis. The complete set of equations of the dynamic elasticiti theory was used to describe deformation of the elastic cylinder. The waves in the filling liquid were described by the wave equation. The technique of systematization of data about the dispersion of normal waves is offered. The method uses the idea of partial subsystems. The essential differences in development of the wave coupling effects in the cylinder and liquid for cases of rigid and complaint materials are shown. Analysis of geometric, physical and wave parameters of a bronchial tree and its elements has been condacted. Acoustical and mathematical models of airways (taking into account compliance of their walls) and of parts of articulation between them are stated. Obtained results allowed us to develop an algorithm of general solving for the problem of wave propagation in a bronchial tree. An acoustic model of lung parenchyma, modified by allowance for elastic properties of alveolar walls, transpulmonary pressure and surface tension forces acting on gas-tissue interface, is offered.

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