2017
DOI: 10.1038/s41598-017-13706-4
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Rainbow-trapping absorbers: Broadband, perfect and asymmetric sound absorption by subwavelength panels for transmission problems

Abstract: Perfect, broadband and asymmetric sound absorption is theoretically, numerically and experimentally reported by using subwavelength thickness panels in a transmission problem. The panels are composed of a periodic array of varying crosssection waveguides, each of them being loaded by Helmholtz resonators (HRs) with graded dimensions. The low cut-off frequency of the absorption band is fixed by the resonance frequency of the deepest HR, that reduces drastically the transmission. The preceding HR is designed wit… Show more

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Cited by 329 publications
(281 citation statements)
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“…It should be noted that obtaining this particular regime where the radiative losses exactly compensate for the viscous losses supports a certain deviation in the adjustment of the losses and a wider range of values (for the quality factors) also gives similar results. In a way, this medium can be seen as a broadband perfect absorber similarly to the one obtained in acoustics with Helmholtz resonators [41].…”
mentioning
confidence: 85%
“…It should be noted that obtaining this particular regime where the radiative losses exactly compensate for the viscous losses supports a certain deviation in the adjustment of the losses and a wider range of values (for the quality factors) also gives similar results. In a way, this medium can be seen as a broadband perfect absorber similarly to the one obtained in acoustics with Helmholtz resonators [41].…”
mentioning
confidence: 85%
“…The problem is therefore half critically coupled. To obtain a higher absorption, other strategies based on breaking the symmetry of the resonator [5] or on the use of degenerate resonators are needed [28]. In these cases, both eigenvalues present poles and zeros located at the same real frequencies.…”
Section: Design Of Maximal Absorbers For Flexural Wave In the Transmimentioning
confidence: 99%
“…For example, when damping is absent total reflection can occur and, with visco-thermal losses accounted for, it is possible to absorb up to half of the incident wave energy close to resonance 3 . Perfect absoprtion can be achieved by two resonators 4,5 and multiple resonators, tuned to different frequencies, extend these effects over multiple frequencies 6 , having a close connection to a phenomenon labelled "rainbow trapping" in Physics 7 .…”
Section: Introductionmentioning
confidence: 99%
“…Thus, a modulated array acts to block wave transmission over a broad range of wave frequencies. When damping is added, broadbanded absorption of wave energy can be induced 6,11 .…”
Section: Introductionmentioning
confidence: 99%