Sound Absorption Performance Of Acoustic Metamaterial

Zahari, Amir Haziq (2021) Sound Absorption Performance Of Acoustic Metamaterial. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Acoustic metamaterial is a manmade artificial structure that arranged repetitively with having its own characteristic and properties. Acoustic metamaterial is one of the new designated structure used for sound absorption application. Various designs have been created from past researcher in purpose to produce an effective structure for sound absorption. For years, natural materials have been used for research and application in many fields especially in sound absorption purpose. In long terms, the continuous uses of this material will harm the natural resources. Modern technologies such as CAD software and 3D printing technology have a great potential to overcome this problem in future. The aim of this research is to utilize the CAD software in designing and producing 3D model of acoustic metamaterial by using 3D printing technology. The 3D printed metamaterial is tested in lab experiment and the sound absorption performance is observed. The 3D printed metamaterial is made of ABS material. ANSYS software is used to determine the natural frequency of the metamaterial for lab experiment requirement. Impedance tube method is used to study the sound absorption performance. PHOTON analyzer and MATLAB are used to collect and interpret the data from the experiment. The result indicates that the 3D printed metamaterial able to work well in absorbing sound especial at low frequency and high frequency. The sound absorption performance at low frequency is dissimilar for all the samples because of the different in design. Furthermore, the effectiveness of the samples in absorption performance can be improve by increasing the cavity depth which is the air gap in impedance tube. The sound absorption performance at low frequency and the absorption peak improved and better result can be obtained.

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