Natural fibre is being studied and used as sound absorber for its promising acoustic properties. For instance, Germany have commercial plants that are producing sound absorbers from natural fibre. Natural fibre is eco-friendly and has no effect on human health. Besides that, the production cost of natural fibre is cheaper than synthetic fibre. This research reported the thickness effects on acoustic properties in different ratios of natural fibres of empty fruit bunch (EFB) and oil palm frond (OPF). Four different thickness of low density fibre board (LDF) have been fabricated (12 mm, 14 mm, 16 mm and 18 mm) in density of 120 kg/m3 . The Sound Absorption Coefficient (SAC) was tested by using the Impedance Tube Method (ITM) according to ASTM E1050-98 standards at frequency from 0 Hz to 6400 Hz. The results show the values of SAC for all samples increase with increasing in thickness from frequency range of 0 Hz – 4500 Hz. It is noteworthy that the LDF with thickness of 16 mm and 18 mm can be classified as Class A sound absorbing material according to sound absorption classes and possess the SAC values of 0.8 and above at a wider frequency range, which is 2500 Hz to 6400 Hz. The combination of EFP and OPF natural fibres has a very promising and excellent performance in acoustic properties.
The society understands the importance of using sound-absorbing panels to protect our health against the noise pollution. However, the repercussions of fibreglass as sound-absorbing panels on human health and the environment have increased year by year. Natural fibers are more environmentally friendly and have significantly lower production cost. This research emphasizes the acoustic properties of different blending ratios of Empty Fruit Bunch (EFB) and Oil Palm Frond (OPF at four different thickness. Their acoustic properties were tested by using the Impedance Tube Method (ITM) from frequency range of 0 - 6400 Hz. The findings show the Sound Absorption Coefficient (SAC) value increases as the frequency increases for all samples. Both blending ratios have good SAC results. For blending ratio of 30% EFB – 70% OPF, the SAC of the panels achieved 80% and above at frequency between 3500 - 6400 Hz for samples with thickness of 14 mm, 16 mm and 18 mm. However, for blending ratio of 20% EFB – 80% OPF, the SAC of all samples are found 0.8 and above at frequency between 3500 - 6400 Hz. Notably, the SAC values for both blending ratio are increased with increasing in thickness. It might be attributed to the effect of tortuosity. The SAC values for all samples are also found to achieve unity ( ∼ 0.96 ) at different frequency range. Furthermore, the frequency range for SAC to reach 0.8 and above has been increased from 4500 – 6400 Hz to 3500 – 6400 Hz with an increased in OPF contents.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.