Active control of scattered acoustic radiation: a real-time implementation for a three-dimensional object

Emmanuel Friot (1) , Régine Guillermin (1) , Muriel Winninger (1)

1 LMA - Laboratoire de Mécanique et d'Acoustique [Marseille]

This paper presents an active noise control experiment designed to validate a real-time control strategy for reduction of the noise scattered from a three-dimensional body. The control algorithm relies on estimating the scattered noise by linear filtering of the total noise measured around the body; suitable filters are identified from off-line measurements. A modified Filtered-Error Least-Mean-Squares algorithm then leads to the adaptive filters which drive the secondary sources. The paper provides the numerical simulations using a Boundary Element Method which helped in designing a feasible experiment in an anechoic chamber with a limited number of control sources. Eventually a real-time pure-tone implementation with 14 ordinary loudspeakers and a large body is shown to yield on average a 10~dB reduction of the scattered noise at the error sensors, which is close to the optimum reduction predicted by the numerical simulations for the sensor arrangement.

Mots clés: active noise control; scattering; real-time control

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

Emmanuel Friot, Régine Guillermin, Muriel Winninger. Active control of scattered acoustic radiation: a real-time implementation for a three-dimensional object. Acta Acustica united with Acustica, 2006, 92, pp.278-288. ⟨hal-00014092⟩