Summary: | 碩士 === 國立成功大學 === 工程科學系 === 104 === In recent years, the emergence of membrane-type acoustic metamaterial, which has been a subject of widely-extended discussion, provides a novel way to isolate the low-frequency noise. In this study, I fabricated a novel structure called coupled membrane structure which is comprised of two membrane-type metamaterials. I used the acoustic impedance tube and Comsol Multiphysics, a finite element analysis software package, to examine its transmission loss (TL). Compared to the single-layer metamaterial, an extra TL peak and valley are occurred. I also discovered that the effect of the thermal-curing temperature and air spacing on the TL curves. A good agreement between experiment and simulation is achieved.
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