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.
[1] LIU Zheng-you, ZHANG Xi-xiang, MAO Yi-wei,et al. Locally resonant sonic materials[J].science,2000,289(5485): 1734-1736.
[2] 梅军, 杨旻, 杨志宇, 等.薄膜型负质量密度声学超常介质[J].物理, 2010, 39(04):234-247.
MEI Jun, YANG Min, YANG Zhi-yu, et al.Membrane-type acoustic metamaterial withnegative dynamic mass [J].Physical,2010, 39(04):234-247.
[3] Z.Yang, MEI Jun, YANG Min, et al. Membrane-type acoustic metamaterial with negative dynamic mass[J]. Physical review letters, 2008, 101(20): 204301.
[4] Naify C J, Chang C M, McKnight G, et al. Transmission loss and dynamic response of membrane-type locally resonant acoustic metamaterials[J]. Journal of Applied Physics, 2010, 108(11): 114905.
[5] Yang Z, Dai H M, Chan N H, et al. Acoustic metamaterial panels for sound attenuation in the 50–1000 Hz regime[J]. Applied Physics Letters, 2010, 96(4): 041906.
[6] 梅军，马冠聪，杨旻，等. 2012 物理 41(07) 425-433
MEI Jun, YANG Guan-cong, YANG Min, et al.
[7] CHEN Yang-yang, HUANG Guo-liang, ZHOU Xiao-ming, et al. Analytical coupled vibroacoustic modeling of membrane-type acoustic metamaterials: Plate model[J]. The Journal of the Acoustical Society of America, 2014, 136(6): 2926-2934.
[8] 吴九汇，张思文，沈礼. 螺旋局域共振单元声子晶体板结构的低频振动带隙特性研究[J].机械工程学报, 2013, 39(2): 62-69.
WU Jiu-hui, ZHANG Si-wen, CHEN Li.Low-frequency Vibration Characteristics of Periodic Spiral Resonators in
Phononic Crystal Plates[J].
2013, 39(2): 62-69.
[9] Siwen Zhang，Jiu Hui Wu，Zhiping Hu Low-frequency locally resonant band-gaps in phononic crystal plates with periodic spiral resonators[J]. Journal of Applied Physics, 2013, 113(16): 163511.
[10] 刘红星, 吴九汇, 沈礼，等.声子晶体结构低频降噪机理研究及应用[J].南京大学学报：自然科学版, 2013, 49(4)：530-537.
LIU Hong-xing, WU Jiu-hui, SHEN Li, et al.Low-frequency noise reduction based on quasi-bandgap of phonoic crystal structures[J].Journal of Nanjing University: Natural Sciences, 2013, 49(4)：530-537.
[11] 徐芝纶. 弹性力学简明教程[M].高等教育出版社,2013.
XU Zhi-lun.Simple teaching of elasticity[M].Higher Education Press,2013
