A new type of artificial structure to achieve broadband omnidirectional acoustic absorption
Li-Yang Zheng,
Ying Wu,
Xiao-Liu Zhang,
Xu Ni,
Ze-Guo Chen,
Ming-Hui Lu,
Yan-Feng Chen
Affiliations
Li-Yang Zheng
National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University - 210093 Nanjing, People's Republic of China
Ying Wu
Computer, Electrical and Mathematical Sciences and Engineering, King Abdullah University of Science and Technology (KAUST) - 23955-6900 Thuwal, Saudi Arabia
Xiao-Liu Zhang
National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University - 210093 Nanjing, People's Republic of China
Xu Ni
National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University - 210093 Nanjing, People's Republic of China
Ze-Guo Chen
National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University - 210093 Nanjing, People's Republic of China
Ming-Hui Lu
National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University - 210093 Nanjing, People's Republic of China
Yan-Feng Chen
National Laboratory of Solid State Microstructures & Department of Materials Science and Engineering, Nanjing University - 210093 Nanjing, People's Republic of China
We present a design for a two-dimensional omnidirectional acoustic absorber that can achieve 98.6% absorption of acoustic waves in water, forming an effective acoustic black hole. This artificial black hole consists of an absorptive core coated with layers of periodically distributed polymer cylinders embedded in water. Effective medium theory describes the response of the coating layers to the acoustic waves. The polymer parameters can be adjusted, allowing practical fabrication of the absorber. Since the proposed structure does not rely on resonances, it is applicable to broad bandwidths. The design might be extended to a variety of applications.
