Vibro-acoustic characterization of Angklung bamboo tube

Abstract

Angklung is one of the most popular Indonesian traditional bamboo musical instruments. In this paper, bamboo tubes were harvested from West Java, which were sorted and crafted by an angklung-maker maestro. This paper is focused on finding the correlation of those bamboo tubes both in acoustic characteristic and mechanical vibration. There are three data that are measured simultaneously: force from the exciting impact hammer, normal acceleration from accelerometer, and sound pressure from a microphone. Accordingly, bamboo tubes' mechanical admittance and acoustic sound pressure level was calculated. In terms of frequency response, it was found that the admittance and SPL of each tube are well correlated. All of the tubes have inharmonic frequency overtones with the first overtone 2.17 times higher than its fundamental frequency.