Yoshinaga Tsukasa, Zhang Zhaoyan
School of Medicine, University of California, Los Angeles, 1000 Veteran Avenue, Los Angeles, California 90024, USA.
Graduate School of Engineering Science, Osaka University, 1-3 Machikaneyama, Toyonaka, 560-8531, Japan.
J Acoust Soc Am. 2025 Apr 1;157(4):2408-2421. doi: 10.1121/10.0036359.
Although voice production often involves false vocal fold (FVF) adduction and aryepiglottic sphincter (AES) narrowing, their effects on the voice source still remain unclear. In this study, a three-dimensional (3D) compressible flow simulation coupled to a two-mass vocal fold model in a vocal tract with varying degrees of constriction at the levels of the FVF and AES is conducted. Results showed a small effect of FVF adduction and AES narrowing on the voice source except when the FVFs were strongly adducted. Strong FVF adduction reduced the glottal resistance and increased the transglottal pressure, thus strengthening the voice source. This reduction in glottal resistance is a result of the glottal jet persisting longer into the supraglottal region, which can be achieved by constricting the jet from the medial-lateral direction. In contrast, constricting the jet flow from the anterior-posterior direction had almost no influence on the source strength. In summary, the effect of the 3D supraglottal flow features on the voice source is small except for extreme FVF adduction, and the effect of epilaryngeal adduction is mainly on the vocal tract transfer function rather than the voice source.
尽管发声通常涉及假声带（FVF）内收和杓会厌括约肌（AES）变窄，但其对声源的影响仍不清楚。在本研究中，进行了三维（3D）可压缩流模拟，并结合了在FVF和AES水平具有不同程度收缩的声道中的双质量声带模型。结果表明，除了FVF强烈内收时，FVF内收和AES变窄对声源的影响较小。强烈的FVF内收降低了声门阻力并增加了跨声门压力，从而增强了声源。声门阻力的降低是声门射流在声门上区域持续更长时间的结果，这可以通过从内侧-外侧方向收缩射流来实现。相比之下，从前后方向收缩射流对声源强度几乎没有影响。总之，除了极端的FVF内收外，3D声门上流特征对声源的影响较小，喉上内收的影响主要在于声道传递函数而非声源。
