A khaen pipe is an open bamboo pipe of effective length L, with the free reed located at approximately L/4. The physical length of the pipe is greater than L, with two rectangular tuning slots cut into the pipe defining its effective length and resulting in the presence of open cylindrical end sections. Properties of individual khaen pipes and collective effects of two or more pipes sounding together were studied experimentally and using finite element modeling software. The modeling software using fluid dynamics was used to simulate a number of properties and develop tools for further study. It was verified experimentally that synchronization of slightly mistuned pipes does occur. Input impedance curves obtained from simulation and experiment were found to agree very well in detail. Simulation was used to identify the pipe modes involving end sections that are responsible for the appearance of some non-harmonic peaks in the impedance curves. Also studied were sound radiation patterns from air-driven pipes and the dynamics of air-driven reed vibration. Ongoing work includes realistic modeling of an air-driven reed by simulating fluid-structure interactions due to a pressure difference. An eventual goal is a model of the complete khaen.
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January 30 2020
Finite element simulation and experiment in khaen acoustics
Will C. Martin;
Will C. Martin, Kali Nash, James P. Cottingham; Finite element simulation and experiment in khaen acoustics. Proc. Mtgs. Acoust. 2 December 2019; 39 (1): 035003. https://doi.org/10.1121/2.0001178
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