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Using liner surface modes in acoustic ducts to make obstacles reflectionless.
Scientific Reports ( IF 3.8 ) Pub Date : 2019-05-06 , DOI: 10.1038/s41598-019-43538-3 Maaz Farooqui 1 , Yves Aurégan 1 , Vincent Pagneux 1
Scientific Reports ( IF 3.8 ) Pub Date : 2019-05-06 , DOI: 10.1038/s41598-019-43538-3 Maaz Farooqui 1 , Yves Aurégan 1 , Vincent Pagneux 1
Affiliation
Acoustic cloaking for the suppression of backscattering inside ducts is proposed in the audible range where plane waves are curved around the object using the surface modes of the liner. It is numerically shown that a slowly varying resonant liner (e.g. based on an array of tubes) creates a zone of silence in which an object of arbitrary shape can be acoustically hidden for a wide range of frequencies. And then, a resonant liner has deflecting properties without reflection of the wavefront, which are close to an ideal invisibility cloak. This kind of cloaking is effective in a wide frequency band and the cloaking band is a function of the impedance and height of the obstacle relative to the conduit. For smooth shaped obstacles, there is an ability of the object to help hide itself, which increases the cloaking frequency band (self-cloaking). Dispersion effects lead to slow sounds and distortion of the wave phase.
中文翻译:
在声管中使用衬里表面模式可以使障碍物无反射。
在可听范围内,提出了利用声波掩盖来抑制管道内部反向散射的方法,在可听范围内,利用衬里的表面模式,平面波在物体周围弯曲。从数值上显示,缓慢变化的谐振衬里(例如基于管阵列)会创建一个静默区域,在该静默区域中,任意形状的对象都可以在很宽的频率范围内被声学隐藏。然后,谐振衬管具有偏转特性,而没有波前反射,这接近理想的隐形斗篷。这种掩盖在很宽的频带内有效,并且掩盖带是障碍物相对于导管的阻抗和高度的函数。对于形状平滑的障碍物,对象具有帮助自己隐藏自身的能力,从而增加了掩盖频段(自掩盖)。
更新日期:2019-05-06
中文翻译:
在声管中使用衬里表面模式可以使障碍物无反射。
在可听范围内,提出了利用声波掩盖来抑制管道内部反向散射的方法,在可听范围内,利用衬里的表面模式,平面波在物体周围弯曲。从数值上显示,缓慢变化的谐振衬里(例如基于管阵列)会创建一个静默区域,在该静默区域中,任意形状的对象都可以在很宽的频率范围内被声学隐藏。然后,谐振衬管具有偏转特性,而没有波前反射,这接近理想的隐形斗篷。这种掩盖在很宽的频带内有效,并且掩盖带是障碍物相对于导管的阻抗和高度的函数。对于形状平滑的障碍物,对象具有帮助自己隐藏自身的能力,从而增加了掩盖频段(自掩盖)。