The effect of three-dimensional glottal geometry on intraglottal quasi-steady flow distributions and their relationship with phonation  

作　　者：SCHERER Ronald C. 

机构地区：[1]Department of Communication Disorders, Bowling Green State University, 200 Health Center, Bowling Green, Ohio 43402, USA

出　　处：《Science China(Life Sciences)》2006年第1期82-88,共7页中国科学（生命科学英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.30070212&69925101);the National Institutes of Health of America(Grant No.2 R01 DC03577).

摘　　要：Vocal fold geometry plays an important role in human phonation. The intraglottal quasi-steady pressure; velocity distributions depend upon the shape, size,; diameter of the glottis. This study reports the effects of the variation of glottal shapes on intraglottal pressures; velocities using a Plexiglas model with a glottis having nine symmetric glottal angles (uniform, as well as convergent; divergent 5°, 10°, 20°; 40°), while the minimal glottal diameter was held constant at 0.06 cm. The empirical data were supported by penalty finite element computational results. The results suggest that larger convergent glottal angles correspond to increased pressures; decreased velocities in the glottis upstream of the minimum glottal location, with a reversal of this pattern at the minimal glottal diameter location. The pressure dip near the glottal entrance for divergent glottal angles was greatest for the 10° divergence angle condition,; was sequentially less for 5°, 20°,; 40°. Flow resistance was greater for a convergent angle than a divergent angle of the same value,; least for the 10° divergent condition. Pressure recovery in the glottis suggested that the optimal glottal diffuser angle was near 10°. Results suggest that the glottal geometry has a critical relationship with phonation (especially for vocal efficiency),; therefore important significance to understanding artistic voice; clinical voice management.Vocal fold geometry plays an important role in human phonation. The intraglottal quasi- steady pressure and velocity distributions depend upon the shape, size, and diameter of the glottis. This study reports the effects of the variation of glottal shapes on intraglottal pressures and velocities using a Plexiglas model with a glottis having nine symmetric glottal angles (uniform, as well as con-vergent and divergent 5°, 10°, 20° and 40°), while the minimal glottal diameter was held constant at 0.06 cm. The empirical data were supported by penalty finite element computational results. The re-sults suggest that larger convergent glottal angles correspond to increased pressures and decreased velocities in the glottis upstream of the minimum glottal location, with a reversal of this pattern at the minimal glottal diameter location. The pressure dip near the glottal entrance for divergent glottal an-gles was greatest for the 10° divergence angle condition, and was sequentially less for 5°, 20°, and 40°. Flow resistance was greater for a convergent angle than a divergent angle of the same value, and least for the 10° divergent condition. Pressure recovery in the glottis suggested that the optimal glottal diffuser angle was near 10°. Results suggest that the glottal geometry has a critical relationship with phonation (especially for vocal efficiency), and therefore important significance to understanding artistic voice and clinical voice management.

关 键 词：VOCAL FOLD geometry  LARYNGEAL AERODYNAMICS modeling  phonation  quasi-steady flow. 

分 类 号：R767[医药卫生—耳鼻咽喉科]