Sound scattering from underwater elastic spherical shell covered with multilayered medium approximated acoustic cloak

作     者：SUN Yang AN Junying XU Haiting 

作者机构：Qingdao Acoustics LaboratoryInstitute of AcousticsChinese Academy of Sciences National Laboratory of AcousticsInstitute of AcousticsChinese Academy of Sciences 

出 版 物：《Chinese Journal of Acoustics》 (声学学报（英文版）)

年 卷 期：2014年第33卷第2期

页      面：97-108页

学科分类：07[理学] 082403[工学-水声工程] 08[工学] 070206[理学-声学] 0824[工学-船舶与海洋工程] 0702[理学-物理学] 

主　　题：Sound scattering from underwater elastic spherical shell covered with multilayered medium approximated acoustic cloak 

摘      要：The anechoic performance and mechanism of underwater elastic spherical shell covered with coating are studied at low *** acoustic cloak is anisotropic material,which can be designed with homogeneous isotropic materials on the basis of effective medium approximation *** analytic expression of scattering acoustic field from the shell covered with multilayered medium is formulated and the scattering form function,resonance mode,acoustic field distribution are computed,the scattering characteristics and mechanism of transmission are *** results show that the direction of sound transmission inside the multilayered medium is changed,the acoustic field is deflected gradually,and the acoustic energy flux is guided around the target,which reduces the scattering intensity at low frequencies,the acoustic intensity of target＇s surface is very *** the first resonance peak in spectrum produced by the zero order partial wave,the other resonance modes of elastic spherical shell are not excitated and the multilayered medium can suppress the resonance of the spherical shell effectively.