敷设弱化隐声衣弹性壳体的声散射
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- 英文论文题名：Acoustic scattering from elastic shell covered with acoustic near-cloaking
- 论文作者：孙阳 ; 安俊英
- 英文论文作者：SUN Yang ; AN Jun-ying ; Qingdao Branch ; Institute of Acoustics ; Chinese Academy of Sciences
- 年：2016
- 作者机构：中国科学院声学研究所北海研究站;
- 论文关键词：隐声衣 ; 弹性壳体 ; 声散射
- 英文论文关键词：acoustic cloaking ; elastic shell ; acoustic scattering
- 会议召开时间：2016-10-25
- 会议录名称：2016年中国造船工程学会水中目标特性学组学术交流会论文集
- 语种：中文
- 分类号：TB564
- 学会代码：SXJS
- 会议名称：2016年中国造船工程学会水中目标特性学组学术交流会
- 会议地点：中国辽宁大连
- 主办单位：中国船舶重工集团公司第七六0研究所水中测控技术重点实验室
- 学会名称：《声学技术》编辑部
- 页数：4
- 文件大小：639k
- 原文格式：D
- 会议级别：全国
摘要
本文主要研究弱化隐声衣与非规则弹性壳体复合结构的声散射特性。根据等效介质理论,将各向同性多层介质形成的弱化隐声衣作为覆盖层,建立敷设弱化隐声衣非规则弹性壳体的声散射理论模型,并验证模型的有效性。计算了平头短柱壳敷设弱化隐声衣前后的声散射频响特性以及目标外部散射声场、总声场和弱化隐声衣中各层介质的声场分布。研究表明,弱化隐声衣可以较好的抑制弹性壳体的低频谐振散射特性。隐声衣内的声波在多层介质之间的声传播方向发生改变,声场形成弯曲变形,声能流绕过目标,使得通过隐声衣到达弹性壳体表面的声场强度减小,进而减弱了弹性壳体的声散射强度。
The scattering characteristics are studied for the composite structure of acoustic near-cloaking and irregular elastic shell. The coating is designed with homogeneous isotropic materials on the basis of effective medium approximation theory. The acoustic scattering model of irregular elastic shell covered with acoustic near-cloaking is expressed, and the validity is verified. The scattering frequency response characteristics, scattering sound field and total sound field of the even-end cylindrical shell covered and uncovered with acoustic near-cloaking are computed, and the acoustic field distribution of the near-cloaking is also computed. The results show that the resonance characteristic of the elastic shell is suppressed by the near-cloaking at low frequency. Inside the near-cloaking, the direction of transmission is changed, the acoustic field is gradually deflected, and the acoustic energy flux is guided around the target. Due to the direction of transmission is changed; the acoustic intensity of target's surface is very weak, which reduces the reradiating acoustic intensity.
The scattering characteristics are studied for the composite structure of acoustic near-cloaking and irregular elastic shell. The coating is designed with homogeneous isotropic materials on the basis of effective medium approximation theory. The acoustic scattering model of irregular elastic shell covered with acoustic near-cloaking is expressed, and the validity is verified. The scattering frequency response characteristics, scattering sound field and total sound field of the even-end cylindrical shell covered and uncovered with acoustic near-cloaking are computed, and the acoustic field distribution of the near-cloaking is also computed. The results show that the resonance characteristic of the elastic shell is suppressed by the near-cloaking at low frequency. Inside the near-cloaking, the direction of transmission is changed, the acoustic field is gradually deflected, and the acoustic energy flux is guided around the target. Due to the direction of transmission is changed; the acoustic intensity of target's surface is very weak, which reduces the reradiating acoustic intensity.
引文
[1]Jin Hu,Xiaoming,Gengkai Hu.A numerical method for designing acoustic cloak with arbitrary shapes[J].Computational Materials Science,2009,02:006,1-5.
[2]L Peng,L Ran,N A Mortensen.The scattering of a cylindrical invisibility cloak:reduced parameters and optimization[J].2011,Physics.Optics,23,1102.4678.
[3]C.L.Scandrett,A.M.Vieira.Fluid-structure effects of cloaking a submerged spherical shell[J].J.Acoust.Soc.Am,2013,134(3):1908-1919.
[4]Xun Huang,Siyang Zhong,Oksana Stalnov.Analysis of scattering from an acoustic cloak in a moving fluid[J].J.Acoust.Soc.Am,2014,135(5):2571-19192580.
[5]沈惠杰,温激鸿,郁殿龙,等.基于主动声学超材料的圆柱声隐身斗篷设计研究.物理学报,2012,61(13):134303.SHEN Hui Jie,WEN Jihong,YU Dianlong,et al.Research on a cylindrical cloak with active acoustic metamaterial layers.Acta Phys.Sin.2012,61(13):134303.
[6]高东宝,曾新吾.基于各向同性材料的层状椭圆柱声隐声衣设计.物理学报,2012,61(18):184301.GAO Dongbao,ZENG Xinwu.Layered elliptical-culindrical acoustic cloaking design based on isotropic materials.Acta Phys.Sin.2012,61(18):184301.
[7]孙阳,安俊英,徐海亭.近似声斗篷的多层介质覆盖水中弹性球壳的声散射.声学学报,2013,38(6):699-705.SUN Yang,AN Junying,XU Haiting.Sound scattering from underwater elastic sphere shell covered with multilayered medium approximated acoustic cloak.CHINESE JOURNAL OF ACOUSTICS,2013,38(6):699-705.
[8]Torrent D,Sanchez-Dehesa J.Acoustic cloaking in two dimensions:a feasible approach[J].New Journal of Physics,2008,10(6):063 015.
[2]L Peng,L Ran,N A Mortensen.The scattering of a cylindrical invisibility cloak:reduced parameters and optimization[J].2011,Physics.Optics,23,1102.4678.
[3]C.L.Scandrett,A.M.Vieira.Fluid-structure effects of cloaking a submerged spherical shell[J].J.Acoust.Soc.Am,2013,134(3):1908-1919.
[4]Xun Huang,Siyang Zhong,Oksana Stalnov.Analysis of scattering from an acoustic cloak in a moving fluid[J].J.Acoust.Soc.Am,2014,135(5):2571-19192580.
[5]沈惠杰,温激鸿,郁殿龙,等.基于主动声学超材料的圆柱声隐身斗篷设计研究.物理学报,2012,61(13):134303.SHEN Hui Jie,WEN Jihong,YU Dianlong,et al.Research on a cylindrical cloak with active acoustic metamaterial layers.Acta Phys.Sin.2012,61(13):134303.
[6]高东宝,曾新吾.基于各向同性材料的层状椭圆柱声隐声衣设计.物理学报,2012,61(18):184301.GAO Dongbao,ZENG Xinwu.Layered elliptical-culindrical acoustic cloaking design based on isotropic materials.Acta Phys.Sin.2012,61(18):184301.
[7]孙阳,安俊英,徐海亭.近似声斗篷的多层介质覆盖水中弹性球壳的声散射.声学学报,2013,38(6):699-705.SUN Yang,AN Junying,XU Haiting.Sound scattering from underwater elastic sphere shell covered with multilayered medium approximated acoustic cloak.CHINESE JOURNAL OF ACOUSTICS,2013,38(6):699-705.
[8]Torrent D,Sanchez-Dehesa J.Acoustic cloaking in two dimensions:a feasible approach[J].New Journal of Physics,2008,10(6):063 015.