I.V.Vovk, O.I.Vovk On physical modelling of noise generated by airflow in segments of respiratrory system of man |
Acoustic bulletin, Vol. 2 ¹ 2, (1999) |
| We analysed physical and geometric characteristics of larynx and adjacent to it cavities from aerohydromechanic point. Physical model of this part of the respiratory system was built on the basis of this analysis. We developed the experimental methods that allow one to evaluate aerodynamic resistance of the physical model as well as spectra of noise, generated by the airflow along the model. We obtained a vast number of real data. Analysis of this data allowed us to draw a number of important laws. In particular, we showed that aerodynamic resistance of diaphragm, which modells the glottis, depends significantly on shape and dimensions of the last. We found out that as degree of symmetry of the glottis shape decreases and its area increases the aerodynamic resistance of diaphragm falls. It was shown that level and nature of spectra of noise generated by the airflow passing the glottis depends on shape and dimensions of the glottis as well as on airflow speed. In particular, we found that the decrease in symmetry of the glottis shape, increase of its area and decrease of airflow speed result in decrease of integral level of noise generated by the flow. |
|
KEY WORDS: physical modeling, larynx, aerodynamic drag, sound generation by the flow |
| TEXT LANGUAGE: Russian |