Abstract
This study investigated and compared the acoustic characteristics of two natural organic fibres: date palm fibre and oil palm fibre, these materials eligible for acoustical absorption. During the processing stage, both fibre sheets are treated with latex. The two fibres are compressed after latex treatment Circular samples (100 mm in diameter and 28 mm, based on the measurement tube requirements) are cut out of the sheets. The density of the date palm fibre sheet is 150 kg/m 3 for a 50 mm thickness and 130 kg/m 3 for a 30 mm thickness. In contrast, the density of oil palm fibre is 75 kg/m 3 for a 50 mm thickness and 65 kg/m 3 for a 30 mm thickness. An impedance tube was used to test the thicknesses of both samples based on international standards. The results show that the date palm fibre exhibits two Acoustic Absorption Coefficient (AAC) peaks: 0.93 at 1356 Hz and 0.99 at 4200-4353 Hz for the 50- mm-thick sample. In contrast, the 30-mm-thick sample has a single AAC peak of 0.83 at 2381.38-2809.38 Hz. However, the 50-mm-thick oil palm fibre has an AAC peak of 0.75 at 1946.88-2178.13 Hz and the 30-mm-thick oil palm fibre has an acoustic absorption coefficient peak 0.59 at 3225-3712.5 Hz. Thus, the date palm fibre has a higher acoustic absorption coefficient for high and low frequencies than does oil palm fibre. Both fibres are promising for use as sound absorber materials to protect against environmental noise pollution.
Highlights
There is increasing interest in organic natural fibres for various uses in many applications, such as insulation materials and barriers
The comparison between the two sample thicknesses (30 and 50 mm, respectively) of date palm fibre and oil palm fibre are shown in Fig. 6 and 7, respectively
We can see that the date palm fibre gives a higher acoustic absorption coefficient value than the oil palm fibre
Summary
There is increasing interest in organic natural fibres for various uses in many applications, such as insulation materials and barriers. Iraq and Malaysia have large amounts of date palm fibre and oil palm fibre agricultural waste products, respectively This research was conducted to understand the potential use of date palm fibre and oil palm fibre instead of industrial fibres in acoustic absorption applications. The most important parameters to determine acoustic characteristics are the acoustic absorption coefficient To determine these parameters by using the tests conducted in the impedance tube, SCS software programme was used to determine the coefficient of absorption for two types of materials. The two types of fibres used for the sound absorption in samples were of the same thicknesses, 50 and 30 mm, as shown in Fig. 2 and 3, respectively.
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