柔らかいノズルからでる噴流の音

抄録

Buzzing sound generated by lips is studied to understand a biological sound. This is known as a sound which is generated when the trumpet player blows breath to a mouth piece. The dominant frequency of the pulsatile jet related to the vibration of the opening and shutting of lips model made by konjak jelly must be obtained by the force balance of the pressure and closing force of lips. The sound and vibration of the lips are observed experimentally by using a microphone with a high directivity and a high-speed CCD camera. In this experiment, the relationship between open-close cycle of lips and frequency of buzzing sound was focused on. The open-close cycle determines the frequency of emission of pulsatile jet from the model, and the possibility of that the open-close cycle of the model depends on its natural frequency was shown by calculations. The sound sources are discussed in this paper.