![]() ![]() Low-frequency sound absorption has always been a research hotspot due to its wider applications in several important fields, including noise control, environmental protection, and architectural acoustics. The proposed planar wall has the advantages of ultrathin planar structure and omnidirectional low-frequency dual-band sound absorption, which provides diverse routes to design advanced sound-absorption structures in noise control and architectural acoustics. Furthermore, the application of the proposed ultrathin planar wall in the design of a barrier-free anechoic room with omnidirectional low-frequency dual-band sound absorption is further discussed in detail. The fractional bandwidths of the bands I and II can reach about 34.1 and 10.4%, respectively. In addition to the band I created by a conventional resonance coupling of the two multiple-cavity resonators, it is worth noting that the band II is realized by a mutual resonance coupling between the resonators and groove structure. The sound absorption of the wall exists in two working bands (IandII) below 600 Hz which are created by two different mechanisms. The proposed planar wall is constructed by a periodic subwavelength unit cell (with a thickness of λ/19) which consists of two different multiple-cavity resonators embedded into a plate structure with a groove. We report the numerical and experimental realization of a type of ultrathin planar wall with low-frequency dual-band sound absorption. 3State Key Laboratory of Acoustics, Institute of Acoustics, Chinese Academy of Sciences, Beijing, China.2Key Laboratory of Modern Acoustics, National Laboratory of Solid State Microstructures, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, China.1Research Center of Fluid Machinery Engineering and Technology, School of Physics and Electronic Engineering, Jiangsu University, Zhenjiang, China.Yu-wei Xu 1, Yi-jun Guan 1,2,3, Jia-li Yin 1, Yong Ge 1, Hong-xiang Sun 1,3*, Shou-qi Yuan 1* and Xiao-jun Liu 2,3* ![]()
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