Wall vibrations in air-driven free reed bamboo pipes

Abstract

In previous investigations of wall vibrations in bamboo pipes from Asian free reed mouth organs, modal frequencies and mode shapes of a number of pipes were measured. Measurements of pipe input impedance were made, some of which suggested possible changes occurring as a result of damping the pipe vibrations. [Cottingham, J. Acoust. Soc. Am. 114, 2348 (2010)]. The goal of this current work is to study the vibration of the pipe walls for the mechanically blown reed-pipe combination. This was done for undamped pipes and pipes heavily damped with sand or other damping material. Measurements of the internal sound field for both damped and undamped pipes were made as well as measurements of pipe impedance. Effects of the damping of wall vibrations on the radiated sound and the sounding frequency were also explored. [Work partially supported by National Science Foundation REU Grant PHY-1004860.]