In many controlled acoustics applications, it is desirable to engineer passive-adaptive manipulation of mechanical waves through waveguides based solely on varying dynamic input. We investigate the potential of achieving this using experiments on several types of nonlinear acoustic metamaterial plates. By tuning the amplitude-dependent response of locally resonant attachments and tailoring their patterning on or within a host plate-type medium, amplitude-activated shifts in bandgap frequency ranges could be utilized to tailor the direction and bandwidth of wave propagation through such metamaterials. Prototype test articles for passive-adaptive wave rejection, steering, sorting and selective beaming were constructed and tested using customized rigs. The location, extent and shift of bandgaps were experimentally and numerically verified. Scalable waveguide designs are experimentally evaluated for low (150–250 Hz) and much higher (16–20 kHz) frequency ranges. The potential to steer and sort waves in a tunable frequency range toward specific regions or paths within the waveguide is demonstrated. With current precision and hybrid fabrication techniques attaining commercial maturity, metamaterials-based approaches offer great promise in realizing waveguides with built-in, adaptive functionalities related to filtering, transduction and actuation for mechanical waves.

中文翻译：

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使用非线性超材料板的被动自适应机械波操纵

在许多受控声学应用中，希望仅基于变化的动态输入设计通过波导对机械波进行被动自适应操纵。我们通过在几种类型的非线性声学超材料板上进行实验来研究实现这一目标的潜力。通过调整局部共振附件的幅度相关响应并在宿主板型介质上或内部调整它们的图案，可以利用带隙频率范围内的幅度激活偏移来调整通过这种超材料的波传播的方向和带宽。用于被动自适应波抑制、转向、分类和选择性波束的原型测试物品是使用定制的钻机构建和测试的。通过实验和数值验证了带隙的位置、范围和偏移。可伸缩波导设计在低 (150–250 Hz) 和更高 (16–20 kHz) 频率范围内进行了实验评估。演示了在可调谐频率范围内将波引导和分类到波导内的特定区域或路径的潜力。随着当前精密和混合制造技术的商业成熟，基于超材料的方法为实现具有内置自适应功能的波导提供了广阔的前景，这些功能与机械波的过滤、转换和驱动相关。