TY - JOUR N2 - Natural fibres are attractive as the raw material for developing sound absorber, as they are green, eco-friendly, and health friendly. In this paper, pineapple leaf fibre/epoxy composite is considered in sound absorber development where several values of mechanical pressures were introduced during the fabrication of absorber composite. The results show that the composite can absorb incoming sound wave, where sound absorption coefficients α _n > 0.5 are pronounced at mid and high frequencies. It is also found that 23.15 kN/m^2 mechanical pressure in composite fabrication is preferred, while higher pressure leads to solid panel rather than sound absorber so that the absorption capability reduces. To extend the absorption towards lower frequency, the composite absorber requires thickness higher than 3 cm, while a thinner absorber is only effective at 1 kHz and above. Additionally, it is confirmed that the Delany-Bazley formulation fails to predict associated absorption behavior of pineapple leaf fibre-based absorber. Meanwhile, a modified Delany-Bazley model discussed in this paper is more useful. It is expected that the model can assist further development of the pineapple leaf composite sound absorber. L1 - http://journals.pan.pl/Content/116314/PDF/aoa.2020.133144.pdf L2 - http://journals.pan.pl/Content/116314 PY - 2020 IS - No 2 EP - 240 DO - 10.24425/aoa.2020.133144 KW - natural fibres KW - pineapple leaf/epoxy composite KW - sound absorber KW - absorption prediction model A1 - Adhika, Damar Rastri A1 - Prasetiyo, Iwan A1 - Noeriman, Abiyoga A1 - Hidayah, Nurul A1 - Widayani PB - Polish Academy of Sciences, Institute of Fundamental Technological Research, Committee on Acoustics VL - vol. 45 DA - 2020.05.10 T1 - Sound Absorption Characteristics of Pineapple Leaf/Epoxy Composite SP - 233 UR - http://journals.pan.pl/dlibra/publication/edition/116314 T2 - Archives of Acoustics ER -