摘要：This paper presents the sound and vibration damping properties of nonwoven flax reinforced acrylic based polyester composites. This research attempt to solve the problem of synthetic fibre which caused environmental problems. the goal of is study to characterize the sound absorption and damping properties of the natural fibre at difference thickness and pressure. the nonwoven flax reinforced acrylic based polyester composites are produced by using moulding machines at different compression pressures that are 10, 20 and 30 bars. the thicknesses of samples used in this study are 2 mm and 3 mm. the measurement of sound absorption of the material is carried out using impedance tube. For the sample with 2 mm thickness, the result shows that the maximum sound absorption of 0.93 was observed at frequency of 853 Hz and pressure of 20 bars. Damping values are calculated and measure for each sample. the result shows that damping factor is obtained is 0.039 and 0.052 for thickness materials of 2mm and 3mm.
