三维喉模型中声门射流和声带动力学的直接数值模拟。
Direct-numerical simulation of the glottal jet and vocal-fold dynamics in a three-dimensional laryngeal model.
机构信息
Department of Mechanical Engineering, Johns Hopkins University, 126 Latrobe Hall, 3400 North Charles Street, Baltimore, Maryland 21218, USA.
出版信息
J Acoust Soc Am. 2011 Jul;130(1):404-15. doi: 10.1121/1.3592216.
Abstract
An immersed-boundary method based flow solver coupled with a finite-element solid dynamics solver is employed in order to conduct direct-numerical simulations of phonatory dynamics in a three-dimensional model of the human larynx. The computed features of the glottal flow including mean and peak flow rates, and the open and skewness quotients are found to be within the normal physiological range. The flow-induced vibration pattern shows the classical "convergent-divergent" glottal shape, and the vibration amplitude is also found to be typical for human phonation. The vocal fold motion is analyzed through the method of empirical eigenfunctions and this analysis indicates a 1:1 modal entrainment between the "adduction-abduction" mode and the "mucosal wave" mode. The glottal jet is found to exhibit noticeable cycle-to-cycle asymmetric deflections and the mechanism underlying this phenomenon is examined.
摘要
采用基于浸没边界的流求解器与有限元固体动力学求解器相结合的方法，对人类喉的三维模型中的发声动力学进行直接数值模拟。计算得到的声门射流特征，包括平均和峰值流速以及开口和偏斜度比，均处于正常生理范围之内。流引起的振动模式显示出典型的“收敛-发散”声门形状，并且振动幅度也典型适用于人类发声。通过经验特征函数的方法对声带运动进行分析，该分析表明“内收-外展”模式和“黏膜波”模式之间存在 1:1 的模态同步。发现声门射流存在明显的周期性非对称偏折，并且研究了这种现象的产生机制。
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