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Monday, July 8 • 13:00 - 13:20
HIGH-EFFICIENCY SOUND-ABSORBING METASURFACE AT LOW FREQUENCY

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We demonstrate a high-efficiency sound-absorbing metasurface operating at low frequency. The metasurface absorber is based on acoustic porous layer embedded two identical but oppositely oriented split tube resonators. A high absorption (>50%) is obtained in a frequency range from 170 Hz to 750 Hz and over 90% absorption exhibits from 285 Hz to 340 Hz, while the thickness of the absorber is only 1/6 of the relevant wavelength at 500 Hz. The broadband and high absorption performances are due to the coupling of the resonance modes and the trapped mode. Furthermore, the high-efficiency low-frequency absorption of the metasurface is robust under oblique incidence even at large angles. The absorber is ease of fabrication, subwavelength thickness, and robust high-efficiency. Therefore, it has high potential applications in noise control and architectural acoustics.


Monday July 8, 2019 13:00 - 13:20 EDT
St-Laurent 5
  T08 Mat. for noise & vibr. cntrl., SS03 Ac metamtrl & phon crstl: fund & app