Department of Mechanical and Aerospace Engineering, Clarkson University, Potsdam, New York 13699, USA.
Department of Electronic Engineering, Universidad Técnica Federico Santa María, Valparaíso, Chile.
J Acoust Soc Am. 2023 Jan;153(1):654. doi: 10.1121/10.0016997.
Synthetic vocal fold (VF) replicas were used to explore the role of nodule size and stiffness on kinematic, aerodynamic, and acoustic measures of voiced speech production. Emphasis was placed on determining how changes in collision pressure may contribute to the development of phonotrauma. This was performed by adding spherical beads with different sizes and moduli of elasticity at the middle of the medial surface of synthetic silicone VF models, representing nodules of varying size and stiffness. The VF models were incorporated into a hemilaryngeal flow facility. For each case, self-sustained oscillations were investigated at the phonation threshold pressure. It was found that increasing the nodule diameter increased the open quotient, phonation threshold pressure, and phonation threshold flow rate. However, these values did not change considerably as a function of the modulus of elasticity of the nodule. Nevertheless, the ratio of collision pressure to subglottal pressure increased significantly for both increasing nodule size and stiffness. This suggests that over time, both growth in size and fibrosis of nodules will lead to an increasing cycle of compensatory vocal hyperfunction that accelerates phonotrauma.
我们使用合成声带（VF）复制品来探讨结节大小和硬度对发声语音产生的运动学、空气动力学和声学测量的作用。重点是确定碰撞压力的变化如何导致语音创伤的发展。这是通过在合成硅胶 VF 模型的中间内侧表面添加具有不同大小和弹性模量的球形珠来实现的，这些球形珠代表具有不同大小和硬度的结节。VF 模型被纳入半喉流设施。对于每种情况，在发声阈值压力下研究了自维持振荡。结果发现，随着结节直径的增加，开放商、发声阈值压力和发声阈值流量增加。然而，这些值并没有随着结节弹性模量的变化而显著变化。尽管如此，碰撞压力与声门下压力的比值随着结节大小和硬度的增加而显著增加。这表明，随着时间的推移，结节的大小增长和纤维化都会导致代偿性发声亢进的循环不断增加，从而加速语音创伤的发生。
