El Malki Mohamed, Khettabi Ali, Sallah Mohammed, Zaky Zaky A
Laboratory of Materials, Waves, Energy and Environment, Department of Physics, Faculty of Sciences, Mohammed First University, Oujda, 60000, Morocco.
Department of Physics, College of Sciences, University of Bisha, P.O. Box 344, Bisha, 61922, Saudi Arabia.
Sci Rep. 2024 Oct 23;14(1):24987. doi: 10.1038/s41598-024-74799-2.
This study investigates noise reduction using a periodic arrangement of dual Helmholtz resonators and explores the introduction of defects within this periodic structure. The transfer matrix method was employed to carry out theoretical research. The computations of the interface response function approach results are verified, and consistent outcomes are demonstrated. The simulation results highlight the distinctive dual resonance frequencies of dual Helmholtz resonators. By differentiating dual Helmholtz resonators from traditional Helmholtz resonators, prospective applications for low-frequency noise reduction are envisioned. In this contribution, introducing defects in the middle of perfect dual Helmholtz resonators adds more value to the acoustic filter. In particular, the first neck and cavity of the defective dual Helmholtz resonator. This study shows that introducing a 2D-defect into identical dual Helmholtz resonators can improve the transmission of defect modes by taking advantage of the advantageous interaction of the resonant modes. In such arrangements, the entire structure functioned as a potent selective filter.
本研究探讨了使用双亥姆霍兹共振器的周期性排列来降低噪声，并探索了在这种周期性结构中引入缺陷的情况。采用传递矩阵法进行理论研究。验证了界面响应函数方法结果的计算，并展示了一致的结果。模拟结果突出了双亥姆霍兹共振器独特的双共振频率。通过将双亥姆霍兹共振器与传统亥姆霍兹共振器区分开来，设想了低频降噪的潜在应用。在本研究中，在完美的双亥姆霍兹共振器中间引入缺陷为声学滤波器增加了更多价值。特别是有缺陷的双亥姆霍兹共振器的第一个颈部和腔体。本研究表明，通过利用共振模式的有利相互作用，在相同的双亥姆霍兹共振器中引入二维缺陷可以改善缺陷模式的传输。在这种排列中，整个结构起到了强大的选择性滤波器的作用。
