F-0809 高振動数で振動する狭窄部を持つ二次元流路内における空気流れの圧力測定(S43-3 呼吸・循環系の数値シミュレーション)(S43 生体力学シミュレーション)

概要

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In this study static pressures of unsteady airflow through a two-dimensional constricted channel are measured. The objective is to collect the data necessary for establishing a glottal flow model, which is indispensable for the analysis of vocal fold vibration as sound source of voice. In the measurement a rectangular block, a part of upper channel wall, is driven sinusoidally by a mechanical driving device which enables the block to vibrate in 100Hz, as high frequency as vocal fold vibration, and frequency dependence of static pressure is investigated over a range of 10-100Hz. The results show that the frequency strongly influences waveforms, amplitudes and phases of static pressures within and around the constriction. The influences on static pressure are found similar in the middle of the constriction (P(0)) and at its downstream (P(1)), while a different effect is observed on upstream static pressure. Findings obtained on P(0) and P(1) are that their amplitudes decrease greatly with increasing frequency in some frequency range, and that over a certain frequency a peak appears twice in one fundamental cycle of oscillatory static pressure.
社団法人日本機械学会の論文
2001-08-22