The Development of Sound Absorber from Banana Fiber
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Abstract
The aim of this study was to develop the sound absorber from natural materials (cultivated banana fiber) to substitute for synthetic materials (asbestos and fiberglass). This sound absorber was presented particularly on Sound Absorption Coefficient (SAC) and Noise Reduction Coefficient (NRC) according to following factors: (1) fiber length of 0.6, 5.0, 10.0 mm., and (2) banana fiber-gypsum with a ratio of 1:9, 2:8, and 3:7 by weight at 25.0 mm. thickness of each specimen. This experiment was determined on SAC and NRC by impedance tube method based on ISO10534-2 standard in the frequency range 250-4,000 Hz. In addition, the structural and scattering images of banana fiber and surface adhesive by using Scanning Electron Microscope (SEM) were investigated. The result showed that NRC 0.52 of banana fiber specimen in length of 0.6 mm and banana fiber-gypsum ratio of 3:7 by weight appeared more porous and space. Likewise, mathematical model from this experiment showed the variance on the significant (F-Test) to be 0.09 and p - value of banana fiber-gypsum ratio to be 0.05 which was interacted with the value of NCR. Hence, sound absorber from banana fiber can be applied to noise reducing purpose.
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