The effect of subglottic stenosis on vocal fold vibration is investigated. An idealized stenosis is defined, parameterized, and incorporated into a two-dimensional, fully-coupled finite element model of the vocal folds and laryngeal airway. Flow-induced responses of the vocal fold model to varying severities of stenosis are compared. The model vibration was not appreciably affected by stenosis severities of up to 60% occlusion. Model vibration was altered by stenosis severities of 90% or greater, evidenced by decreased superior model displacement, glottal width amplitude, and flow rate amplitude. Predictions of vibration frequency and maximum flow declination rate were also altered by high stenosis severities. The observed changes became more pronounced with increasing stenosis severity and inlet pressure, and the trends correlated well with flow resistance calculations. Flow visualization was used to characterize subglottal flow patterns in the space between the stenosis and the vocal folds. Underlying mechanisms for the observed changes, possible implications for human voice production, and suggestions for future work are discussed.

中文翻译：

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声门下狭窄对计算声带模型流动诱导振动的影响

研究了声门下狭窄对声带振动的影响。理想化的狭窄被定义、参数化并合并到声带和喉部气道的二维、完全耦合的有限元模型中。比较了声带模型对不同严重程度狭窄的流动诱导反应。模型振动不受高达 60% 闭塞的狭窄严重程度的明显影响。模型振动因狭窄严重程度达到 90% 或更高而发生改变，这可以通过降低上级模型位移、声门宽度幅度和流速幅度来证明。高狭窄严重程度也改变了振动频率和最大流量偏角率的预测。随着狭窄程度和入口压力的增加，观察到的变化变得更加明显，并且趋势与流阻计算密切相关。流动可视化用于表征狭窄和声带之间空间中的声门下流动模式。讨论了观察到的变化的潜在机制、对人类声音产生的可能影响以及对未来工作的建议。