声帯自励振動の有限要素シミュレーション : 呼気流の圧縮性の効果について

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Flow-excited vocal cords oscillation is numerically simulated making use of a two-dimensional finite element model. The vocal cords oscillatory system is modeled as a viscoelastic body mutually coupled with compressible nonviscous flow. The Bernoulli force is supposed to play a major role for exciting the vocal cords. The case when the flow was assumed to be incompressible was already reported. In the present paper, the contribution of the expiratory flow compressibility to the oscillation is examined. The layered inhomogeneous structure of the vocal cords and the presence of the false cords are also included in the model. The oscillatory response is demonstrated in terms of the vocal cords movement, the velocity potential, the fluid density and the sound pressure, and the conditions for self-oscillation are discussed with subglottal pressure and the driving velocity taken as parameters. The numerical results indicate that the compressibility of the expiratory flow contributes to the oscillation only in the case when the glottal velocity is extremely fast. The false cords may affect the vocal cords movement in case of intense oscillation. The layered inhomogeneity of the vocal cords does not affect its movement intrinsically. For the mechanism of the vocal cords oscillation, the compressibility of the expiratory flow and the presence of the false cords should be taken into consideration when intense oscillation may results.
日本シミュレーション学会の論文
1994-03-15

声帯自励振動の有限要素シミュレーション : 呼気流の圧縮性の効果について

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