Experimental characterization of hybrid noise control systems acting in acoustic duct

In this investigation, a sound absorbing material is coupled with an active surface to reduce sound pressure within an acoustic duct. In this way, an enhancement of the passive foam performance can be observed because of further acceleration of the fluid particles within the foam pores.

The experimental activity implements noise control strategies to increase damping within the cavity through acoustic foam with a flexible backing plate, acted by piezoelectric actuators.