Transactions of Nanjing University of Aeronautics & Astronautics
Sound Insulation Performance of Acoustic Metamaterials Based on Attachable Helmholtz Resonators
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Abstract:
To address the control of low frequency noises， we propose an new perforated thin-plate acoustic metamaterials with the attachable Helmholtz resonator （AHR） which can be directly attached to the existing structure to suppress acoustic radiation. Sound transmission loss of the aluminium plate with AHR has been simulated using the finite element method under a normal incident plane sound wave. The results show that AHR works well in the 50—500 Hz frequency band， with two peaks of insulation occurring and the corresponding frequency of the first insulation peak dropping to around 120 Hz. The study of the effects of plate thickness， cavity depth， perforation radius and perforation length on the sound insulation performance of metamaterials demonstrates that the effective suppression of acoustic radiation at specific frequencies can be achieved by changing the acoustic radiation properties of the structure.
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TB535
CHINA AERO-SCIENCES
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