Dielectric elastomer minimum energy structure for acoustic absorber’s cavity volume control

Abstract

Dielectric elastomer minimum energy structure for acoustics absorber’s cavity volume control is investigated in this project. In this project, theory of tunable acoustic absorber is reviewed. We demonstrate that sound absorption can be tuned to targeted frequency by changing the volume of the back cavity. A resonator is developed by employing a dielectric elastomer minimum energy structure (DEMES) to control the volume of the back cavity. The DEMES actuators are bonded on both side of the slot, enclose by a powdered membrane to form a back cavity. During application of voltage, the actuator can be unfolded. Hence pressing the powdered membrane inwards, reducing the back cavity volume.