Numerical Analysis of Pathological Voice Production Using Asymmetric Distributed-Parameter Model for Vocal Fold. 2nd Report. Numerical Simulation and Analysis of Asymmetric Vocal Fold Vibration.

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  • 非対称分布声帯モデルによる疾患時の発声の数値解析　第２報　　非対称な声帯振動の数値シミュレーション解析
  • ヒタイショウ ブンプ セイタイ モデル ニ ヨル シッカンジ ノ ハッセイ ノ スウチ カイセキ ダイ2ホウ ヒタイショウ ナ セイタイ シンドウ ノ スウチ シミュレーション カイセキ

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Abstract

Pathological vocal fold vibration is numerically simulated and analyzed using an asymmetric distributed-parameter model, previously proposed by the authors. In the simulations, mass, stiffness, initial glottal half-width at the downstream end and thickness of unilateral vocal fold are chosen as the parameters representative of unilateral vocal fold paralysis, and numerical calculations are carried out for four sets of parameters including one symmetric case. The results show a variety of vibratory patterns such as period-doubling and asymmetries in amplitude and phase, which are comparable with those of patients with paralyzed vocal folds and those observed in model experiments with excised larynges. These dynamical behaviours of great complexity strongly influence speech sound waveforms, and their effects on voice quality are discussed based on spectrum analysis. Furthermore, diversity of vibratory patterns shown by asymmetric vocal folds could be attributable to imbalance in bilateral natural frequencies, made by those parameters.

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