Time-varying non linear modeling of electrodynamic loudspeakers

Romain Ravaud (1) , Guy Lemarquand (1) , Tangi Roussel (2)

1 LAUM - Laboratoire d'Acoustique de l'Université du Mans
2 LRMN - Laboratoire d'Imagerie et de Spectroscopie

This paper deals with the time-varying nonlinear analytical modeling of the electrodynamic loudspeaker. We propose a model which takes into account the variations of Small signal parameters. The six Small signal parameters ($R_{e}$, $L_{e}$, $Bl$, $R_{ms}$, $M_{ms}$, $C_{ms}$) depend on both time and input current. The electrodynamic loudspeaker is characterized by the electrical impedance which, precisely measured, allows us to construct polynomial functions for each Small signal parameter. By using this analytical model, we propose to compare two identical electrodynamic loudspeakers. One of them is supposed to be run in and the other one is not. The experimental methodology is based on a precise measurement. In all the paper, the time scale is assumed to be much longer than one period of the harmonic excitation.

Mots clés: electrodynamic loudpseaker; nonlinearites; impedance; non linear modeling

Domaines: Acoustique [physics.class-ph]; Acoustique [physics.class-ph]

Romain Ravaud, Guy Lemarquand, Tangi Roussel. Time-varying non linear modeling of electrodynamic loudspeakers. Applied Acoustics, 2009, 70 (3), pp.450-458. ⟨10.1016/j.apacoust.2008.05.009⟩. ⟨hal-00368286⟩