Abstract:An acoustic metamaterial is designed based on the concept of fractal curve and spatial coiling, which has the characteristics of small size regulating large wavelength. The equivalent mass density and equivalent volume modulus of the metamaterial are extracted by the equivalent parameter method. At a specific frequency point, the acoustic metamaterial has the characteristic of near zero density, which can realize the zero-phase difference propagation and lossless energy transmission. The finite element analysis shows that the acoustic metamaterial can achieve special acoustic phenomena such as acoustic cloaking, acoustic tunneling, wavefront shaping and acoustic abnormal transmission at near zero density frequency points. Finally, the transmission coefficient of the sample is tested, and the results show that the experimental results are in good agreement with the simulation results, which verifies the validity of the structure, and indicates that the acoustic metamaterial can be used in the design of acoustic devices.
何川,张崇卓,吴光华,陶猛. 声学近零折射率材料的声波调控研究[J]. 振动与冲击, 2023, 42(19): 125-129.
HE Chuan, ZHANG Chongzhuo, WU Guanghua, TAO Meng. Acoustic regulation of acoustic near zero refractive index materials. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(19): 125-129.
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