Zañartu Matías, Mongeau Luc, Wodicka George R
School of Electrical and Computer Engineering and Ray W Herrick Laboratories, Purdue University, 140 S. Intramural Drive, West Lafayette, Indiana 47907, USA.
J Acoust Soc Am. 2007 Feb;121(2):1119-29. doi: 10.1121/1.2409491.
Three-way interactions between sound waves in the subglottal and supraglottal tracts, the vibrations of the vocal folds, and laryngeal flow were investigated. Sound wave propagation was modeled using a wave reflection analog method. An effective single-degree-of-freedom model was designed to model vocal-fold vibrations. The effects of orifice geometry changes on the flow were considered by enforcing a time-varying discharge coefficient within a Bernoulli flow model. The resulting single-degree-of-freedom model allowed for energy transfer from flow to structural vibrations, an essential feature usually incorporated through the use of higher order models. The relative importance of acoustic loading and the time-varying flow resistance for fluid-structure energy transfer was established for various configurations. The results showed that acoustic loading contributed more significantly to the net energy transfer than the time-varying flow resistance, especially for less inertive supraglottal loads. The contribution of supraglottal loading was found to be more significant than that of subglottal loading. Subglottal loading was found to reduce the net energy transfer to the vocal-fold oscillation during phonation, balancing the effects of the supraglottal load.
研究了声门下和声门上声道中的声波、声带振动以及喉部气流之间的三向相互作用。使用波反射模拟方法对声波传播进行建模。设计了一个有效的单自由度模型来模拟声带振动。通过在伯努利流模型中强制使用随时间变化的流量系数，考虑了孔口几何形状变化对气流的影响。所得的单自由度模型允许能量从气流传递到结构振动，这是通常通过使用高阶模型纳入的一个基本特征。针对各种配置确定了声加载和时变流阻对流固能量传递的相对重要性。结果表明，声加载对净能量传递的贡献比时变流阻更为显著，特别是对于惯性较小的声门上负载。发现声门上负载的贡献比声门下负载更为显著。发现声门下负载会减少发声过程中传递到声带振荡的净能量，平衡声门上负载的影响。
