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Free Content Broadband Membrane-Type Acoustic Metamaterials with Polymorphic Anti-Resonance Modes and Experimental Verification

Numerous studies have shown that the acoustic metamaterials have high the sound insulation performance at the anti-resonant frequencies. On the basis of the sub-wavelength locally resonant principle of acoustic metamaterials, we proposed a novel ultrathin lightweight membrane-type acoustic metamaterial (MAM) structure unit with polymorphic anti-resonance modes, which would achieve an excellent ability to insulate the broadband noise between 50 Hz and 736 Hz, besides, the sound transmission loss (STL) amplitude has been promoted to 48 dB. STL was numerically assessed and experimentally tested using a small sample (one cell) inside an impedance tube. Then, STL, modal displacement distributions and effective parameters of the MAM unit were researched to reveal the localized surface anti-resonance characteristics and the formation mechanism of STL peak and bandwidth. As to the designed sample, the design approach with special mass disks distributed on the surface of the membrane generated the polymorphic bending vibration modes among the mass disks and the membrane. The results indicated that the whole composite structure unit becomes the strongly local resonance modes - retrorse lumped coupling resonance and polymorphic anti-resonance - with the incident sound waves, followed by a high sound attenuation, the excellent agreement between theory and experiment is obtained.

Document Type: Research Article

Affiliations: 1: Gissing Tech. Co. Ltd. 2: Xi'an Jiaotong University 3: Gissing Tech. Co., Ltd.

Publication date: 18 December 2018

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