Martin Pégeot - Transient and steady state regimes of the trumpet: experimental and numerical works

Self-sustained musical instruments, such as wind or bowed string instruments, are capable of producing sustained sounds from a continuous supply of energy. At the onset of oscillations, these instruments pass through a transient regime that is more or less perceptible depending on the configuration. In this study, we focus on the transients of a soprano trombone. Transients from one periodic regime to another, passing through a quasi-periodic regime, are first observed experimentally on an instrument fitted with artificial lips. Simulations on a modal brass model reproduce similar transients in the vicinity of a double Hopf bifurcation. This configuration is then studied numerically in detail with time simulations and linear stability analysis.

Nathan Szwarcberg - Oscillation threshold of a Raman clarinet with localized nonlinear losses at the open end

Localized nonlinear losses are taken into account in a simple Raman clarinet model. The complete system is expressed as an iterated map, enabling to study the stability of the different playing regimes. A parametric study is carried out with respect to three major parameters: blowing pressure, embouchure and nonlinear losses coefficient. The model exhibits the well-known effect of reducing the extinction threshold when nonlinear losses increase. However, the stability analysis also shows that increasing nonlinear losses increases the oscillation threshold.

Le mardi 19 novembre 2024 à 11h00 / Amphithéâtre François Canac, LMA