一种外部加翼的圆柱小目标声隐身结构设计  

Design of an acoustic stealth structure for small cylindrical targets with external wings

作　　者：黄金凤 黎洁 范军[1] 王斌[1] HUANG Jinfeng;LI Jie;FAN Jun;WANG Bin(Key Laboratory of Marine Intelligent Equipment and System(Shanghai Jiao Tong University),Ministry of Education,Shanghai 200240,China)

机构地区：[1]上海交通大学海洋智能装备与系统教育部重点实验室,上海200240

出　　处：《声学技术》2024年第2期182-191,共10页Technical Acoustics

摘　　要：针对水下小型航行器日益增强的声隐身需求,基于菲涅耳(Fresnel)半波带理论,提出一种可提高目标声隐身性能的外部加翼结构。利用板块元方法计算并分析不同结构参数的优化翼型结构声隐身性能的提升效果。研究结果表明,外翼覆盖了圆柱散射贡献最大的半波带,加速相位变化,降低入射方向相同投影面积的散射贡献,使得圆柱正横方位的目标强度有效降低。当翼的开角为第一Fresnel半波带对应圆心角度且外翼与圆柱主体相切时,该结构在节约制造成本的同时可使声隐身性能的提升效果最好。文中进行了加翼模型声散射特性水池实验,优化结构的0°方位目标强度下降约7 dB,俯仰方向角检测概率显著降低,证明该类翼型结构可以有效提高目标声隐身性能。A kind of external wing structure able to improve the acoustic stealth performance is proposed based on the Fresnel half-wave zone theory for increasing acoustic stealth demand of small underwater vehicles.The improvement effect of acoustic stealth performance of the optimized airfoil structure with different structural parameters is analyzed by plate element method.The research shows that the wing blocks the half-wave zone with the largest contribution of cylindrical scattering,which leads to the acceleration of phase change and the reduction of the scattering contribution of the same projected area in the incident direction.The target strength in abeam direction of the cylinder can be effectively reduced.When the opening angle of the wing covers the first Fresnel half-wave zone and the wing is tangent to the cylindrical body,this structure can improve the acoustic stealth performance best while saving the manufacturing costs.Acoustic scattering experiment of the winged cylindrical model is conducted in the pool.The target strength of the optimized structure in the 0 degree direction decreases about 7 dB,and the angle detection probability in the pitch direction after optimization is greatly reduced.Hence,this type of winged structure is beneficial to improving the acoustic stealth performance.

关 键 词：声隐身 加翼圆柱 菲涅耳(Fresnel)半波带 目标强度 

分 类 号：TB56[交通运输工程—水声工程]