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| Analysis on the low frequency acoustic absorption performance of a metamaterial membrane |
| CAO Weifeng, BAI Hong-bai, ZHU Qing |
| Ordnance Engineering College, Vehicle and Electric Engineering Department, Shijiazhuang 050003, China |
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Abstract A metamaterial membrane with hard frame was presented, which was installed with many small massspring systems serving as low frequency wave absorbers. The mechanical wave transmitted in the metamaterial membrane was absorbed by the springmass absorbers at the resonance frequency of the system, which verifies the effectiveness of the sound wave absorption performance of the membrame. Based on the analysis on the vibration mode in local resonance, the negative effective mass was explained by the metamaterial membrane absorption mechanism. The substructure cell and metamaterial membrane modal vibrations were analyzed by numerical simulations. By the comparison between the theoretical form of resonance unit and the model vibration mode of structure cell, the conclusion that both are of the same absorption mechanism was obtained. So, it was proved the effect of the elastic force of membrane acting on the concentrated mass is equivalent to the incident acoustic excitation. The model analysis of two kinds of membranes with different stiffness was carried out and the difference between the vibration mode and the acoustic absorption form was discussed. The metamaterial of the two kinds of memoranes with different stiffness were tested respectively, and the acoustic characteristic relationship between the structure cell and periodical structure was investigated. The results show: that the massspring system has significant influence on the low frequency acoustic absorption.
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Received: 24 August 2016
Published: 15 July 2018
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