I.Yu.Goncharova Expanding cavity as an effective tool for changing the sound transparency of waveguide |
Acoustic bulletin, Vol. 3 ¹ 4, (2000) |
| A mathematical model is developed and a problem on the sound transmission in circular waveguide with circular concentric expanding cavity is solved. It is found out that when the sound propagates in the waveguide with an expanding cavity the frequency zones appear, for which it is observed a considerable decrease of the sound transparency of the system. An influence of the expanding cavity dimensions on change of the sound transparency of the waveguide is investigated. It is ascertained that basic influence on the waveguide cut-off zone positions on the frequency axis is made by variation of the expanding cavity cross-section. The expanding cavity length influences basically on width of the waveguide cut-off zones. The ways of an optimization of geometrical parameters for considered system are determined. |
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KEY WORDS: waveguide, the expansion chamber, acoustic transparence |
| TEXT LANGUAGE: Russian |