| Issue |
Acta Acust.
Volume 7, 2023
|
|
|---|---|---|
| Article Number | 2 | |
| Number of page(s) | 10 | |
| Section | Active Control | |
| DOI | https://doi.org/10.1051/aacus/2022058 | |
| Published online | 09 January 2023 | |
Scientific Article
Robust direct acoustic impedance control using two microphones for mixed feedforward-feedback controller
Signal Processing Laboratory 2, EPFL, 1015 Lausanne, Switzerland
* Corresponding author: maxime.volery@epfl.ch
Received:
14
July
2022
Accepted:
24
November
2022
This paper presents an acoustic impedance control architecture for an electroacoustic absorber combining both feedforward and feedback microphone-based strategies on a current-driven loudspeaker. Feedforward systems enable good performance for direct impedance control. However, inaccuracies in the required actuator model can lead to a loss of passivity, which can cause unstable behaviour. The feedback contribution allows the absorber to better handle model errors and still achieve an accurate impedance, preserving passivity. Numerical and experimental studies were conducted to compare this new architecture against a state-of-the-art feedforward control method.
Key words: Active sound absorption / Electrodynamic loudspeaker / Feedback control / Feedforward control / Model uncertainty / Passivity / Pressure control
© The Author(s), Published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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