V.T.Grinchenko, V.T.Matsipura Sound radiation from open end of wedge-shaped waveguide. II. Analysis of numerical results |
Acoustic bulletin, Vol. 3 ¹ 2, (2000) |
| The problem of sound radiation from open edge of wedge-shaped waveguide is considered. Qualitative data about the structure and energy characteristics of the sound field are presented. As the initial calculating relationships the formulas from [1] are used. Geometric peculiarity of the waveguides under consideration is that the walls are asymmetric with respect to vertex of wedge. The additional elongation of eigther wall is considering as a screen and is important element in control mechanism of the near and far field characteristics. Qualitative estimations of the effect of the screen length on extent of sound insulation in the zone of acoustical shadow is presented. The data about change of the sound pattern when the parameters of the waveguides are changed illustrate a complex structure of radiated sound field and strong dependence of one on structure of normal wave carrying the energy to edge of wavegiude. Qualitative description of the far field structure is complemented by data about concentration factor of the sound energy and distribution of energy between transmitted and reflected waves. It is shown that elongation of the screen can produce a decrease of the sound energy concentration. |
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KEY WORDS: open wedge-shaped waveguide, near and far field control, a baffle, radiation concentration coefficient |
| TEXT LANGUAGE: Russian |