声学黑洞加筋板结构的声振特性分析  

Acoustic and vibration characteristics analysis of acoustic black hole stiffened plate structures

作　　者：温华兵 黄惠文 史自强 郭俊华 WEN Hua-bing;HUANG Hui-wen;SHI Zi-qiang;GUO Jun-hua(School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang 212100,China)

机构地区：[1]江苏科技大学能源与动力学院,江苏镇江212100

出　　处：《船舶力学》2024年第3期442-449,共8页Journal of Ship Mechanics

基　　金：国防科技重点实验室基金资助项目(6142204190510)。

摘　　要：基于声学黑洞与加强筋这两种结构设计出声学黑洞加筋板,通过建立声学黑洞加筋板、加强筋的有限元模型,对两种结构的声辐射特性、振动能量分布与传递特性开展研究。仿真结果表明:在高于截止频率时声学黑洞加筋板的辐射声功率级比普通加筋板降低8~20 dB,由于敷设的局部阻尼使聚集在声学黑洞区域的振动能得到有效的耗散,因此其振动水平下降明显且与声场耦合变弱;通过分析振动能量分布特性验证了声学黑洞加筋板结构大部分动能聚集在声学黑洞区域,减弱整体结构的振动水平;振动传递特性揭示了声学黑洞加筋板受声学黑洞聚能与加强筋阻振的叠加效应,相比于普通加筋板,声学黑洞加筋板具有更优的减振降噪性能。An acoustic black hole stiffened plate was designed based on acoustic black hole and stiffener structures.Acoustic radiation characteristics,vibration energy distribution and transmission characteristics were studied by establishing the finite element model of the acoustic black hole stiffened plate.The simula⁃tion results show that the radiated sound power of the acoustic black hole stiffened plate is 8~20 dB lower than that of ordinary stiffened plates above the cut-off frequency.Because of the local damping layer,the vi⁃bration gathered in the acoustic black hole’s region is effectively dissipated.Therefore,the vibration level is significantly lowered and the acoustic black hole stiffened plate is weakly coupled to the sound field.It is ver⁃ified that most of the kinetic energy of the acoustic black hole stiffened plate is concentrated in the acoustic black hole region while analysis of the vibration energy distribution characteristics shows that the vibration level of the overall structure is reduced.It is revealed that the acoustic black hole stiffened plate is affected by the superposition effects which include acoustic black hole’s concentrating energy effect and stiffened plate’s blocking vibration effect.Compared with ordinary stiffened plates,acoustic black hole stiffened plates have better vibration and noise’s reduction performance.

关 键 词：声学黑洞 加强筋 减振降噪 声辐射 功率流 

分 类 号：TB535[理学—物理]