Effect of fibre size and sample thickness on kenaf core as a potential acoustical material

Ngu, Ung Hie (2016) Effect of fibre size and sample thickness on kenaf core as a potential acoustical material. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Acoustic is relating to the sound or sense of hearing measurement. Nowadays, the acoustic material made from synthetic and also natural material. Most of the researchers used natural fibre as reinforcement in the acoustic material rather than natural core. Hence, this research focuses on the kenaf core as the raw material for sound absorption due to its light weight and high porosity. Kenaf has its scientific name, which is Hibiscus Cannabinus L. The objectives of this research are to study the effect of acoustic performance based on different fibre size and sample thickness at low, medium and high frequencies. There are four types of fibre size used in this research, which are 0.420mm, 0.841mm, 1mm and 2mm. Five grades of sample thickness are used in this research, which are 10mm, 20mm, 30mm, 40mm and 50mm. The fabricated samples are subjected to microscopic observation and sound absorption testing which is impedance tube test. This test is compliance to ASTM E1050-98 standard. Through this testing, kenaf core with fibre size of 1 mm and sample thickness of 50mm has the optimum acoustic performance at low frequency. For medium frequency, fibre size of 2mm with sample thickness of 20mm has the highest absorption coefficient. Sample thickness with 40mm with fibre size of 1mm has the best acoustic performance at high frequency among the sample prepared. Furthermore, sample thickness has significant effect on sound absorption at low frequency.

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