Local resonance structure (LRS) can effectively suppress wave transmission, but the design of LRS with tunable band gaps is still a challenge. This work proposes an LRS with two tunable band gaps, where the first bandwidth is successfully enlarged almost five times, and finally a low-frequency broadband with 60–420 Hz is obtained with the second disappearing because of the remarkable modification of band gaps obtained only by adjusting the stiffness rather than by large deformation or changing geometric configuration in traditional methods. The mechanism of tunable band gaps would have important implications for designing metamaterials with broadband, and potential applications for vibration and noise attenuation.

中文翻译：

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局部共振结构内的低频带隙

局部共振结构（LRS）可以有效抑制波的传输，但设计带隙可调的LRS仍然是一个挑战。这项工作提出了一种具有两个可调带隙的 LRS，其中第一个带宽成功地扩大了近五倍，最后获得了 60-420 Hz 的低频宽带，而第二个则消失了，因为仅获得了对带隙的显着修改通过调整刚度而不是传统方法中的大变形或改变几何形状。可调谐带隙的机制将对设计宽带超材料以及振动和噪声衰减的潜在应用具有重要意义。