Abstract
Metamaterials-based acoustic sensing technologies play an important role in many practical applications, such as structural health monitoring, sound source localization, underwater acoustic communication, etc. Here, we propose a gradient acoustic metamaterial (GAM) with tunablity for acoustic sensing. The proposed tunable GAM consists of an array of plates and couples with springs, which enables the working frequency band to be broadened and adjusted by compressing the springs to change the air gap distance between every two plates. The numerical and experimental results show that a more than 300 Hz bandwidth is broadened based on the tunable GAM. Furthermore, we take Gaussian pulse signal as an example to prove the importance of tunablity in the field of acoustic sensing. We believe that the flexibility of tunable GAMs will be more suitable in practical applications.
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