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Wednesday, July 10 • 17:50 - 18:10
ELECTROACOUSTIC RESONATORS: SYSTEM IDENTIFICATION AND STABILITY

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An Electroacoustic Resonator consists of a loudspeaker used as a membrane resonator, through an acoustic pressure-based controlled electrical current, in order to vary its vibrating velocity in response to an exogenous sound field. This way, the loudspeaker membrane can be turned, for example, into an effectively broadband sound absorber. However, the effectiveness and stability conditions of such an active device are intrinsically dependent on the accurate knowledge of its electromechanical constituents and the whole control chain, and any mismatch might impair significantly the control performance. In this paper, we propose a new method for identifying the Thiele-Small parameters of a loudspeaker to be used as an active electroacoustic resonator through a digitally-implemented control architecture. Then, numerical and experimental investigation are undertaken to show how the application of Impedance Control laws affects the stability of the electro-mechano-acoustical system. An experimental verification of the acoustic performance of the proposed control strategy is provided, leading to concluding discussion on further developments.

Moderators
BG

Bruno Gazengel

Professor, Laboratoire d'Acoustique de l'Université du Mans
MM

Manuel Melon

Professor, LAUM / LE MANS Université

Authors

Wednesday July 10, 2019 17:50 - 18:10 EDT
Westmount 6
  T02 Act. noise & vib. cntrl., SS01 Actuators & sensors …