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This contribution focuses on innovative acoustic liner concepts for reducing noise transmission through acoustic waveguides. The technology employed to implement such innovative boundary treatments are electro-active acoustic absorbers making use of loudspeakers (as actuators) and microphones (as sensors). Its most ambitious application is in the nacelle of the new generation of Ultra-High-By-Pass-Ratio (UHBPR) turbofans. In particular, this work targets higher modal-order sound fields (such as the ones in the UHBPR in the frequencies of interest). A nonlocal boundary operator is presented to show the potentialities of programmable metasurfaces in overcoming the performances of classical liner technologies.
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Emanuele De Bono, Morvan Ouisse, Manuel Collet, Edouard Salze, Jacky Mardjono, "A nonlocal boundary control, from plane waves to spinning modes control.," Proc. SPIE 12483, Active and Passive Smart Structures and Integrated Systems XVII, 124831B (28 April 2023); https://doi.org/10.1117/12.2658382