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Aerospace and Mechanical Engineering by Qi Luo

By Qi Luo

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Coconut is one of the most important harvests in Malaysia. Coir fiber from coconut husk is one of the hardest natural fibers having high amount of lignin. The sound absorption attribute of coir fiber was investigated previously in Automotive Research Group laboratories, UniversitiKebangsaan Malaysia. Those studies covered experimental observations in reverberation room [11]. and using impedance tube [12]. The aim of this research is to study the potential use of date palm fiber for sound absorption applications.

4. For further improvements of the self-facing panel, experiments were conducted using air gap thicknesses of 10 mm, 20 mm and 30 mm were used between the date palm fiber sample and the rigid backing of the impedance tube. Fig. 5 shows a sketch of the set-up used for the measurement of the sound absorption of the sampleinside the impedance tube. 28 Aerospace and Mechanical Engineering Fig. 4 The netted structure used for self-facing and the aluminum perforated panel Fig. 5 Sketch of the palm date fibers sample and the PP inside the impedance tube Results and Discussion Sound absorption of the uncovered sample (UC), self-facing natural date palm fibers and facing using PP aluminum plate has been investigated.

Table 1 Temperature 140℃ Parameters of standard setting Bonding time Ultrasonic power 5 7 Bonding pressure Bonding time Bonding current 6 6 5 Experiment results The experiment will be done by adjusting the bonding time (or ultrasonic power, bonding pressure), keeping the other parameters and the preset reference value unchanged, and the range of each parameters is 1-10. In the state of each parameter, the strength of the bonding was measured many times to get the equal value. Table 2 shows the strength of bonding pad, figure 2 shows the trend of the strength changing.

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