Soft Materials with Broadband and Near-Total Absorption of Sound

Shichao Cui, Ryan L. Harne

Research output: Contribution to journalArticlepeer-review

Abstract

Low- A nd broadband-frequency sound absorption promotes myriad practical applications and scientific endeavors. Yet emerging metamaterial concepts enable such sound absorption only by the use of a complex assembly of attenuator constituents or by the addition of heavy undesirable mass. In this study, multiple low-frequency hybrid resonances are achieved in a soft-lightweight-material-based Helmholtz resonator. By replacing the rigid walls of a traditional Helmholtz resonator with compliant walls and by tailoring the relative structural and acoustic compliances, a unique multiphysics coupling among the material, structure, and sound is realized. These coupling mechanisms yield hybrid resonances that can be used for subwavelength, broadband, and near-total absorption of sound. As a result, the compliant-material resonator exploits a lightweight-material monolithic design that exerts dramatic and tunable control over low-frequency and broadband acoustic-energy transfer. This paper details analytical and experimental investigations to test the concept and reveals strategies for near-total absorption at arbitrary subwavelength frequencies.

Original languageEnglish (US)
Article number064059
JournalPhysical Review Applied
Volume12
Issue number6
DOIs
StatePublished - Dec 27 2019

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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