Effect of fabrication parameters on the vibro-acoustic behavior of 3-D printed membrane-type resonators

The rising interest in acoustic metamaterial applications stems from the ability to manipulate sound waves through locally resonant structures. Membrane-type resonators continue to arouse the curiosity of researchers, particularly because of their potential for low-frequency sound insulation purposes. When designing a membrane-type resonator, the magnitude of stress within the membrane is a critical factor in attenuating targeted frequencies. The fused deposition modeling (FDM) method offers versatile fabrication options for resonator design via multi-material printing capabilities. The residual stress resulting from the one-shot printing process of a thin, flexible membrane and a relatively rigid frame is expected to vary according to the fabrication parameters. To address this, the effect of these parameters within the FDM process on the pre-stress of membrane resonators is examined. This study involves modal analysis to determine pre-stress using a laser Doppler vibrometer, with results compared to numerical simulations. Finally, the sound transmission loss of selected samples is measured using an impedance tube.