Metasurfaces家族的薄,2 d亚波长尺度的人工材料。这些工程的表面显示出惊人的能力和功能在波前调制应用在过去的二十年。的有效属性metasurface由结构形状而不是写材料。在这些结构中,结构的有效刚度和阻抗等特性的形状和模式的功能。研究者们设计并建造了几个超材料和metasurfaces实现和目标特定的属性,这在本质上是不容易找到的和可用的材料库。这些新的表面和材料可以用于许多应用程序和不同的软机器人、生物医学成像、能量收获。在这项工作的第一部分,一个声metasurface提出结合卷和空洞的概念。假设提出的声学metasurface有12个独立的几何参数。然后,每个参数对声透射和反射的影响研究,并提出了一种设计方法。It 表明 该 metasurface 能 调节 入射 声波 的 阶段 2 -span 同时 保留 其 amplitude. This feature enabled the applicability of the proposed acoustic metasurface in designing some structures to redirect, split and focus the incident acoustic wave without losing the wave energy. In the second part of this work, the proposed metasurface is developed to address the problem of simultaneous sound silencing and air ventilation in low frequencies. It is shown that the proposed metasurface reduces the sound transmission up to 18 dB in a broad band while covering low-frequency ranges. The presented numerical studies indicate that the proposed thin acoustic metasurface has an insignificant effect on air ventilation and heat transfer. It is shown that this feature makes the proposed metasurface an ideal case for designing silent spaces. Finally, in the third part of this work, an analytical solution is developed to study and extract the effective properties of acoustic metamaterials from the impedance tube measurements. This solution extends the previous methods and facilitates the study of acoustic metamaterials when the impedance tub and sample do not have the same sizes. It is shown that the proposed solution is able to extract the effective properties of acoustic metamaterials with high accuracies.--Author's abstract展开/折叠切换