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A modal approach for the efficient analysis of a bionic multi-layer sound absorption structure
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 Title & Authors
A modal approach for the efficient analysis of a bionic multi-layer sound absorption structure
Wang, Yonghua; Xu, Chengyu; Wan, Yanling; Li, Jing; Yu, Huadong; Ren, Luquan;
The interest of this article lies in the proposition of using bionic method to develop a new sound absorber and analyze the efficient of this absorber in a ski cabin. Inspired by the coupling absorption structure of the skin and feather of a typical silent flying bird - owl, a bionic coupling multi-layer structure model is developed, which is composed of a micro-silt plate, porous fibrous material and a flexible micro-perforated membrane backed with airspace. The finite element simulation method with ACTRAN is applied to calculate the acoustic performance of the multi-layer absorber, the vibration modal of the ski cabin and the sound pressure level (SPL) near the skier`s ears before and after pasting the absorber at the flour carpet and seats in the cabin. As expected, the SPL near the ears was significantly reduced after adding sound-absorbing material. Among them, the model 2 and model 5 showed the best sound absorption efficiency and the SPL almost reduced 5 dB. Moreover, it was most effctive for the SPL reduction with full admittance configuration at both the carpet and the seats, and the carpet contribution seems to be predominant.
biomimetic method;multi-layer absorber;modal analysis;sound pressure level;acoustic admittance;
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