Acoustic cloaks enable exciting object concealment by manipulating sound waves and have attracted research efforts from different approaches such as transformation acoustics. However, the challenge still lies in the practical implementation of those cloaks that require complex material designs. Here, we show that an underwater acoustic cloak can be automatically achieved by deforming a soft mechanical metamaterial with Poisson’s ratio of -1. The deformation of such an auxetic structure is demonstrated to be able to automatically and passively fulfill the requirement of quasi-conformal mapping for cloak design. Such a self-adaptive acoustic cloak exhibits a wide frequency and angular bandwidth, which opens an avenue for convenient design of various kinds of acoustic metamaterials.

声学披风通过操纵声波而使物体隐藏起来令人兴奋，并且吸引了来自不同方法（例如变换声学）的研究工作。然而，挑战仍然在于那些需要复杂材料设计的隐身衣的实际实施。在这里，我们表明，可以通过使泊松比为-1的软机械超材料变形来自动实现水下披风。这种膨胀结构的变形被证明能够自动和被动地满足斗篷设计的准保形映射的要求。这种自适应的声学披风具有很宽的频率和角度带宽，为方便设计各种声学超材料提供了途径。