Experimental Study on the Acoustic Structure of the “Suikinkutsu”

Abstract

The “suikinkutu”, one of the traditional techniques of Japanese gardening, has been attracting renewed attention, and in recent years various ways have been tried out to reproduce it. I performed an FFT analysis to establish the reproduction of this technique. This analysis was carried out by recording the sound produced by an original “suikinkutu” found buried in the ground, and the sound produced by simulating the charactaristics of a “suikinkutu” in the laboratory. Based on the analysis of the spectral composition, the acoustic structure of the “suikinkutu” shows that the sound of water drops hitting the surface of the water induces the air inside the “suikinkutu” to resonate with a normal mode of vibration, it is regarded as a type of resonance phenomenon.