1. Robust direct acoustic impedance control using two microphones for mixed feedforward-feedback controller
- Author
-
Volery Maxime, Guo Xinxin, and Lissek Hervé
- Subjects
active sound absorption ,electrodynamic loudspeaker ,feedback control ,feedforward control ,model uncertainty ,passivity ,pressure control ,Acoustics in engineering. Acoustical engineering ,TA365-367 ,Acoustics. Sound ,QC221-246 - Abstract
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.
- Published
- 2023
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