Construction and control of a physiological articulatory model
Construction and control of a physiological articulatory model
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DOI：
10.1121/1.1639325
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发表时间：
2004-02-01
影响因子：
2.4
通讯作者：
Honda, K
中科院分区：
文献类型：
--
作者：
Dang, JW;Honda, K
利用快速计算的方法，通过复制语言器官的正中矢状区来模拟语音过程中的发音运动，建立了生理发音模型。本研究旨在利用基于位移的有限元方法提高建模精度，并开发一种新的模型控制方法。采用具有连续粘弹性圆柱体的离散桁架结构实现了半连续体舌组织模型。在模型模拟的基础上，系统地检查了肌肉的收缩效应。结果表明，每个肌肉驱动舌向一个平衡位置（EP）对应的激活力的大小。EPs随激活力的增大而单调变化。单调位移揭示了一个独特的和不变的映射，称为EP映射，在关节和肌肉力量的空间位置之间。本研究提出了一种基于EP图的关节模型的控制方法，其中考虑了激动剂和拮抗剂肌肉的共同收缩。通过共同收缩，可以控制舌尖和舌背各自独立到达目标。模型仿真表明，在动态控制下，激动肌和拮抗肌的共同收缩可以提高系统的稳定性。(C) 2004美国声学学会。
A physiological articulatory model has been constructed using a fast computation method, which replicates midsagittal regions of the speech organs to simulate articulatory movements during speech. This study aims to improve the accuracy of modeling by using the displacement-based finite-element method and to develop a new approach for controlling the model. A "semicontinuum" tongue tissue model was realized by a discrete truss structure with continuum viscoelastic cylinders. Contractile effects of the muscles were systemically examined based on model simulations. The results indicated that each muscle drives the tongue toward an equilibrium position (EP) corresponding to the magnitude of the activation forces. The EPs shifted monotonically as the activation force increased. The monotonic shift revealed a unique and invariant mapping, referred to as an EP map, between a spatial position of the articulators and the muscle forces. This study proposes a control method for the articulatory model based on the EP maps, in which co-contractions of agonist and antagonist muscles are taken into account. By utilizing the co-contraction, the tongue tip and tongue dorsum can be controlled to reach their targets independently. Model simulation showed that the co-contraction of agonist and antagonist muscles could increase the stability of a system in dynamic control. (C) 2004 Acoustical Society of America.