An Inclined Plane: A Simple Model for the Acoustic Influence of the Flutist's Face

Augustin Ernoult (1, 2) , Patricio de La Cuadra (3, 4) , Benoît Fabre (2)

1 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]
2 DALEMBERT - Institut Jean Le Rond d'Alembert
3 CITA - Centro de Investigacion en Tecnologias de Audio
4 UC - Pontificia Universidad Católica de Chile

In some flute-like instruments, the musician places their mouth near an open-end of the pipe, which modifies the radiation of the pipe and its acoustic resonances. To improve the prediction of this modification, this work presents a study on the effect of an inclined plane at the end of a radiating pipe. The radiation impedance is first measured for different positions of the plane. After verifying that the plane mainly adds an inertance to the radiation, a new simpler and more convenient measurement method is proposed. The behavior observed in these measurements is generalized with the use of finite element simulations. Finally, a global low-frequency model of the effect of an inclined plane on both the imaginary and the real part of the radiation impedance is proposed. This model is consistent with the well-established radiation impedances for unflanged and flanged pipes.

Domaines: Acoustique [physics.class-ph]

Augustin Ernoult, Patricio de La Cuadra, Benoît Fabre. An Inclined Plane: A Simple Model for the Acoustic Influence of the Flutist's Face. Acta Acustica united with Acustica, 2018, 104 (3), pp.496-508. ⟨10.3813/AAA.919192⟩. ⟨hal-01943166⟩