The self-excited oscillation of and the acoustic radiation from reed instruments
P. G. Vaidya · The Journal of the Acoustical Society of America · 1988
A harmonium reed undergoes a self-excited oscillation, when the static pressure on its two sides differs by a value, greater than a critical amount. The reed vibrates at its natural frequency, yet the sound is radiated at multiple frequencies. In this paper, a fluid mechanical model by St. Hilaire has been extended to show how the self-excitation begins, how the oscillation reaches a limit cycle, and how, due to the monopole coupling, radiation at multiple frequencies becomes possible.