I.V.Vovk, V.T.Matsypura Modeling of the process of sound propagation in human thorax. Part 3. Account of sound propagation in the bronchial tree |
Acoustic bulletin, Vol. 15 ¹ 4, (2012) |
| On the basis of previously developed mathematical models of the thorax and bronchial tree, a generalized method is proposed which allows the quantitative assessment of level of the sound propagating from the trachea to chest surface in two ways: the "structural" (through the mediastinum) and "air" one (through the bronchial tree). The results of numerical analysis have shown that sound levels at the chest surface are predominantly determined by the sound passed through the bronchial tree. It was found that frequency dependence of the vibrational velocity on the chest surface has three characteristic peaks. The low frequency maximum is caused by a resonance between the pulmonary parenchyma and the rib-muscle layer, while the mid- and low-range ones occur due to resonance phenomena of air column in the bronchial tree. |
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KEY WORDS: bronchial tree, pulmonary parenchyma, mediastinum, acoustic permeability, resonance |
| TEXT LANGUAGE: Russian |