Fig. 5: Tuning of acoustic absorption spectrum by reconfiguring the absorber through micro-slotted dielectric elastomer bending actuator (MSDEBA) activation.
From: A tunable acoustic absorber using reconfigurable dielectric elastomer actuated petals
a Schematic of inactive and (b) active state of MSDEBA; Schematics of the acoustic absorber with (c) MSDEBA/ Varying-depth (VD) back-cavity; (d) Front micro-slotted panel (MSP)/Back MSDEBA/VD back-cavity. Comparison of acoustic transmission loss (e) for absorber with MSDEBA/VD Back-cavity at different activation voltage; (f) for absorber with Front MSP/ Back MSDEBA/VD Back-cavity at different activation voltage; (g) Photos of the 1 mm thick acrylic panel with cross-slots and square holes placed behind the MSP to mimic MSDEBA at 0 kV and 5 kV respectively. h Normal incidence absorption coefficient of absorber with Front MSP/back MSDEBA/VD Back-cavity at 0 kV and 5 kV and comparison with the mimicking panels with cross-slots and square holes.
