Physiological modeling of speech production: methods for modeling soft-tissue articulators.
Physiological modeling of speech production: methods for modeling soft-tissue articulators.
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DOI：
10.1121/1.411871
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发表时间：
1995-05
期刊：
影响因子：
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通讯作者：
R. Wilhelms-Tricarico
中科院分区：
文献类型：
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作者：
R. Wilhelms-Tricarico
作为语音产生的综合生理模型的初始组成部分，已经开发了用于将诸如舌头和嘴唇的软组织结构建模为连续体的方法。这种方法提供了一个基础，应用有限元方法来模拟这些结构的语音产生的生物力学模型。然后，结构的运动和变形可以被计算为非线性二阶约束常微分方程组的解，该常微分方程组是从能量速率方程的有限元近似获得的。软组织结构中的肌纤维被表示为指定产生主动和被动拉伸应力的方向的场。被动元件的弹性行为采用各向同性指数本构应变能函数建模，粘性应力分量采用线性粘性。不可压缩性保持在模拟中使用一个同时解决系统的计算拉格朗日乘子elementwise。作为声道建模的第一步，已经完成了具有八块肌肉的舌头的初步模型。仿真结果证明了该方法的有效性，并支持基于生理的语音产生模型的可行性。
As the initial components of a comprehensive physiological model of speech production, methods have been developed for modeling soft tissue structures, such as the tongue and lips, as continua. This approach provides a foundation for applying finite element methods to simulate these structures in a biomechanical model of speech production. Movements and deformations of the structures can then be computed as the solutions of a nonlinear second-order constraint system of ordinary differential equations, which is obtained from a finite element approximation of an energy rate equation. The muscle fibers in the soft tissue structures are represented as fields that specify the directions in which active and passive tensile stress is produced. The elastic behavior of the passive components is modeled using an isotropic exponential constitutive strain energy function, and the viscous stress components, by using linear viscosity. Incompressibility is maintained elementwise in the simulation using a simultaneously solved system for the computation of Lagrange multipliers. As first step towards modeling a vocal tract, a preliminary model of a tongue with eight muscles has been completed. Simulation results demonstrate the validity of the method and they support the feasibility of a physiologically based model of speech production.