Department of Head and Neck Surgery, University of California, Los Angeles, 31-24 Rehabilitation Center, 1000 Veteran Avenue, Los Angeles, California 90095-1794, USA.
J Acoust Soc Am. 2019 Jul;146(1):256. doi: 10.1121/1.5116138.
The goal of this study is to identify vocal fold geometric and mechanical conditions that are likely to produce large contact pressure and thus high risk of vocal fold injury. Using a three-dimensional computational model of phonation, parametric simulations are performed with co-variations in vocal fold geometry and stiffness, with and without a vocal tract. For each simulation, the peak contact pressure is calculated. The results show that the subglottal pressure and the transverse stiffness of the vocal folds in the coronal plane have the largest and most consistent effect on the peak contact pressure, indicating the importance of maintaining a balance between the subglottal pressure and transverse stiffness to avoiding vocal fold injury. The presence of a vocal tract generally increases the peak contact pressure, particularly for an open-mouth vocal tract configuration. While a low degree of vocal fold approximation significantly reduces vocal fold contact pressure, for conditions of moderate and tight vocal fold approximation changes in vocal fold approximation may increase or decrease the peak contact pressure. The effects of the medial surface thickness and vocal fold stiffness along the anterior-posterior direction are similarly inconsistent and vary depending on other control parameters and the vocal tract configuration.
本研究的目的是确定可能产生大接触压力从而导致声带损伤风险较高的声门几何形状和机械条件。使用发声的三维计算模型，在有和没有声道的情况下，对声门几何形状和硬度进行参数变化的仿真。为每个仿真计算峰值接触压力。结果表明，声门下压和冠状面中声带的横向硬度对峰值接触压力的影响最大且最一致，这表明维持声门下压和横向硬度之间的平衡对于避免声带损伤非常重要。声道的存在通常会增加峰值接触压力，尤其是对于开口声道配置。虽然声带的低程度接近会显著降低声带接触压力，但对于中度和紧密的声带接近程度，声带接近程度的变化可能会增加或降低峰值接触压力。沿前后方向的中表面厚度和声带硬度的影响也同样不一致，并且取决于其他控制参数和声道配置。
