Low frequency wide band sound absorption performance of asymmetric type acoustic metamaterials

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (19) : 45-49.

NIU Jiamin1，2， WU Jiuhui2

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Abstract

Low frequency sound wave control is a challenging subject, and membrane-type acoustic metamaterials for current hot research can deal with it.However, the sound-absorbing resonant frequency’s dropping is at the expense of resonant bandwidth.Here, the sound-absorbing membrane-type acoustic metamaterials were taken as the study object to study the effects of a resonance mass’s asymmetry on structure’s low frequency wide band sound-absorbing performance.The results showed that the sound absorption performance of a whole structure significantly increases under structural asymmetric mode, and the sound absorption bandwidth is widened; the frequencies for zero equivalent mass density are corresponding to peak values of sound absorption coefficient; a structure with asymmetric modes has higher elastic strain energy than that with symmetry modes does within a full frequency range; each sound absorption peak frequency caused by structure’s asymmetry is adjusted by the mass of a resonant block and reveals a certain law; according to this law, a sound-absorbing structure is designed to achieve the sound absorption effect with low frequency and wide band through numerical calculation.This study provided a theoretical guide for improving low frequency wide band sound-absorbing performance of membrane-type acoustic metamaterials.

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low frequency / wide band / asymmetry / acoustic metamaterials

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NIU Jiamin1，2， WU Jiuhui2. Low frequency wide band sound absorption performance of asymmetric type acoustic metamaterials[J]. Journal of Vibration and Shock, 2018, 37(19): 45-49

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