Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 05, 2021 - September 08, 2021
It is important to know the sound generation system that consists of an elastic nozzle and airflow for further understanding of biological sounds that are created by animals. The sound generation with an elastic nozzle made of konjac gel and an air compressor was experimentally examined. The exit of the nozzle voluntarily vibrated and generated sound when compressed air passed through the nozzle. The experimental result showed that the periodic open-close motion of the nozzle and the periodic bursts have the same frequency and occur synchronically. The pitch of the sound equals the burst frequency. To know how the tone burst such as the sound emitted from the elastic nozzle is detected by the human auditory system, the pitch of the tone bursts with various combinations of the burst frequency and carrier frequency (the frequency of the high-frequency waves that form bursts) were tested. It was examined whether the carrier frequency is clearly, ambiguously, or never heard in each condition of the frequency combination. This investigation suggests the pitch of tone burst is the same as the carrier frequency only when the burst frequency is less than 100 Hz.
