Department of Electrical and Computer Engineering, Duke University, Durham, North Carolina 27708, USA.
Phys Rev Lett. 2011 Jun 24;106(25):253901. doi: 10.1103/PhysRevLett.106.253901. Epub 2011 Jun 22.
We present the design, fabrication, and performance analysis for a class of two-dimensional acoustic cloaking coatings in air. Our approach takes advantage of transformation acoustics and linear coordinate transformations that result in shells which are homogeneous, broadband, and compact. The required material parameters are highly anisotropic; however, we show that they are easily achievable in practice in metamaterials made of perforated plastic plates. The good performance of the fabricated design is assessed from measurements of the sound field produced around the cloak by a broadband source. The remarkably low complexity of the device made of perforated plastic plates shows that sound in air can be fully and effectively manipulated using realizable transformation acoustics devices.
我们提出了一类二维空气声隐身涂层的设计、制造和性能分析。我们的方法利用了变换声学和线性坐标变换，得到了均匀、宽带和紧凑的壳层。所需的材料参数具有高度各向异性，但我们表明，它们在由穿孔塑料板制成的超材料中很容易在实践中实现。通过宽带声源测量隐身涂层周围声场，评估了所设计的制造品的良好性能。由穿孔塑料板制成的设备具有非常低的复杂性，表明可以使用可实现的变换声学器件来充分有效地控制空气中的声音。
