A perioral dynamic model for investigating human speech articulation

作者：Kim Kangsoo^*; Ura Tamaki; Kashino Makio; Gomi Hiroaki

来源：Multibody System Dynamics, 2011, 26(2): 107-134.

DOI：10.1007/s11044-011-9253-z

• Perioral dynamic model
• Discrete particle system
• Articulator
• Continuum-compatible
• Effective force
• Muscle activation
• Inverse dynamics

A multibody system called the perioral dynamic model for investigating dynamic behavior of human speech articulator is presented. The model is based on the biomechanical architecture of human speech articulators, consisting of the soft tissue around the lips, the related muscles, and the jaw bone structure. The dynamic consequence of human speech articulation is revealed as a sequential perioral motion induced by the selectively activated muscle actions. As an anatomically consistent biomechanical platform, the perioral dynamic model is designed to represent the rigid jaw motion as well as the perioral soft tissue deformation interacting with each other. The perioral soft tissue in the model is approximated as a discrete particle system consisting of lumped point masses interconnecting with adjacent ones via viscoelastic elements. To ensure continuum-compatible static deformation in the discrete particle system, we introduce a method of adjusting element stiffness. We also present a new method for determining the effective forces acting on the jaw-bone-attached nodes that transforms jaw dynamics in the rigid body system into the one defined in the discrete particle system, keeping dynamic equivalency and equipollency between two systems. To derive muscle activations which let the developed dynamic model produce a simulated perioral motion mimicking an actual human speech behavior, we present an inverse dynamics technique driven by visual observation-based feedback of an actual lip motion.

• 出版日期2011-8