Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, 30332 Georgia, USA.
Mechanical Engineering Department, University of California, Berkeley, 94720 California, USA.
Phys Rev Lett. 2018 Oct 26;121(17):174301. doi: 10.1103/PhysRevLett.121.174301.
Broadband cloaking of flexural waves is a major challenge since the governing equation is not form invariant under coordinate transformations. We fabricate a flexural cloaking structure using only a single material composed of homogeneous and isotropic layers, and then present experimental evidence of the first near-ideal broadband cloak in thin plates. The 3D-printed structure is shown to effectively disguise an object over a broad frequency range (2 kHz-11 kHz). The proposed cloak has potential applications in shielding sensors and sensitive components from vibrations in bridges, automobiles, and aircraft.
弯曲波的宽带伪装是一个重大挑战，因为在坐标变换下，控制方程不是形式不变的。我们使用仅由同质各向同性层组成的单一材料制造了弯曲伪装结构，然后提供了在薄板中首次实现近理想宽带伪装的实验证据。所提出的伪装结构在很宽的频率范围内（2 kHz-11 kHz）有效地隐藏了物体。该伪装结构在保护桥梁、汽车和飞机中的传感器和敏感元件免受振动方面具有潜在的应用。
