Low-frequency broadband absorption of underwater composite anechoic coating with periodic subwavelength arrays of shunted piezoelectric patches
Low-frequency broadband absorption of underwater composite anechoic coating with periodic subwavelength arrays of shunted piezoelectric patches
复制标题
具有分流压电片周期性亚波长阵列的水下复合消声涂层的低频宽带吸收
DOI：
10.1016/j.compstruct.2019.02.038
复制
发表时间：
2019-05-15
影响因子：
6.3
通讯作者：
Huang, Qibai
中科院分区：
文献类型：
--
作者：
Zhang, Zhifu;Huang, Yizhe;Huang, Qibai
This paper proposes an underwater semi-active composite anechoic coating with periodic subwavelength piezoelectric arrays to broaden the low-frequency absorption bandwidth and improve the absorption coefficient. Based on the effective medium method, the dual equivalent properties for the volume density and Young's modulus of the equivalent thin-plate interlayer are computed. Then, a complete two-dimensional theoretical model for oblique incidence is established by combining the shunt damping technique and wave propagation theory in layered media. On the premise of strictly satisfying the two preconditions of subwavelength assumption and stratified convergence criteria, the correctness and effectiveness of the present model are confirmed by successively according to the finite element simulation results, experimental data, and theoretical predictions. At last, change regulations of seven critical parameters on the sound absorption characteristics of the present coating are investigated to reveal the multiple energy dissipation mechanisms of the overburden in the whole research frequency band.
