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- W4324193882 abstract "Helmholtz resonators (HRs) have the advantage of extending and improving their insulating capacity when used as scatterers in noise barriers made of periodic media, such as sonic crystals (SCs). However, the interaction between multiple Bragg scattering and local resonance phenomena can increase or decrease the insulation of the barrier depending on its design. In the present work, we numerically investigate the factors that determine how such interferences occur and the specific conditions to increase the insertion loss of sonic crystal noise barriers (SCNBs) made of cylindrical scatterers with HRs. Two factors are crucial for the variation of the isolation of the barrier in the Bragg-bandgap (Bragg-BG): the orientation of the resonator mouth with respect to the incident wave, and the resonance frequency of the resonator with respect to the central frequency of the Bragg-BG. Based on this phenomenon, we propose a sonic crystal noise barrier consisting of scatterers with two Helmholtz resonators. The insertion loss of the structure is determined numerically and shows an increase of 20 dB at the BG compared to a conventional barrier with cylindrical scatterers." @default.
- W4324193882 created "2023-03-15" @default.
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- W4324193882 date "2023-03-13" @default.
- W4324193882 modified "2023-10-14" @default.
- W4324193882 title "Increasing the Insertion Loss of Sonic Crystal Noise Barriers with Helmholtz Resonators" @default.
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- W4324193882 doi "https://doi.org/10.3390/app13063662" @default.
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