Baffle silencer with tunable resonators for adaptive control of variable tonal noise

Valérie Pommier-Budinger , Olivier Cherrier (1)

1 ICA - Institut Clément Ader

This article presents a baffle silencer with tunable resonators consisting of two superimposed and identically perforated plates associated with a partitioned cavity made of thermoplastic resin. One plate is fixed while the other is movable. Displacement of the mobile plate changes the internal shapes of the resonator necks and shifts the resonance frequency of the system to lower values. The contributions of this paper are firstly, the modeling of a panel with tunable resonators made of necks with a variable geometry and a partitioned cavity in resin and, secondly, the use of the model to elaborate a control strategy to attenuate variable tonal noise. All of the theoretical studies are validated by experimental measurements. Final results show the efficiency of the silencer in attenuating a tonal noise that varies between 2000 and 2800 Hz.

Mots clés: Acoustic impedance; Adaptive noise control; Baffle silencer; Neck geometry; Partitioned cavities; Tunable resonators

Domaines: Acoustique [physics.class-ph]

Valérie Pommier-Budinger, Olivier Cherrier. Baffle silencer with tunable resonators for adaptive control of variable tonal noise. Journal of Vibration and Control, 2015, 21 (9), pp.1801-1809. ⟨10.1177/1077546313499928⟩. ⟨hal-01840857⟩