Coupled Acoustic-Mechanical Bandgaps

Abstract

Abstract:In this work, we study the existence of coupled bandgaps for corrugated plate structures and acoustic channels. The study is motivated by the observation that the performance of traditional bandgap structures, such as periodic plates, may be compromised due to the coupling to a surrounding acoustic medium and the presence of acoustic resonances. It is demonstrated that corrugation of the plate structure can introduce bending wave bandgaps and bandgaps in the acoustic domain in overlapping and audible frequency ranges. This effect is preserved also when taking the physical coupling between the two domains into account. Additionally, the coupling is shown to introduce extra gaps in the band structure due to modal interaction and the appearance of a cut-on frequency for the fundamental acoustic mode.

Reconfigurable Phononic-Crystal Circuits Formed by Coupled Acoustoelastic Resonators

“…Different wave equations are used for different regions of space, but they are coupled at the fluid-solid interface [17]. Fluid-solid interaction, for instance, was shown to affect the propagation of acoustic and elastic waves, and even to introduce extra gaps into the band structure [18]. A basic feature of a fluid is that it is shapeless though flowing.…”