Alipour F, Scherer R C
Department of Speech Pathology and Audiology, University of Iowa, Iowa City 52242-1012.
J Acoust Soc Am. 1995 Feb;97(2):1241-8. doi: 10.1121/1.412233.
Pulsatile airflow in the excised larynx was investigated with simultaneous recordings of air velocity, subglottal pressure, volume flow, and the electroglottograph signal for various conditions of the larynx. Canine larynges were mounted on a bench with sutures attached to cartilages to mimic the function of laryngeal muscles. Sustained oscillations were established and maintained with the flow of heated and humidified air through the trachea. The instantaneous air velocity above the glottis, which is the summation of a periodic velocity and the turbulent component, was measured with a constant temperature hot-wire probe at various locations. The phase-averaged velocity was used to construct the patterns of jet flow at selected time frames of the oscillation cycle. Results suggest that supraglottal air velocity is highly spatially and temporally dependent. Cycles of local air velocity with double peaks were not uncommon and a case is provided. For one phase-averaged phonatory cycle, a 9 x 13 velocity measurement grid demonstrated strongly nonuniform velocity surfaces for eight phases of the cycle, with greater velocities located anteriorly.
通过同时记录不同喉部条件下的空气流速、声门下压力、容积流量和电声门图信号，对切除的喉部中的脉动气流进行了研究。将犬类喉部安装在工作台上，用缝线连接到软骨上，以模拟喉部肌肉的功能。通过加热和加湿的空气流经气管来建立并维持持续振荡。用恒温热线探头在不同位置测量声门上的瞬时空气流速，它是周期性速度和湍流分量的总和。在振荡周期的选定时间帧处，使用相位平均速度来构建射流模式。结果表明，声门上空气流速在空间和时间上具有高度依赖性。具有双峰的局部空气流速循环并不罕见，并给出了一个例子。对于一个相位平均发声周期，一个9×13的流速测量网格显示，在该周期的八个相位中，速度表面强烈不均匀，前部速度更大。
