An investigation of sound absorption characteristics of Cocos nucifera fiber composite using Taguchi design

The unwanted sound is called noise. Noise from any direction can be reduced by employing sound-absorbing material. All materials have some sound absorption capabilities and can be efficiently regulated by selecting the right material and their construction. The effect of perforated panel thickness (A), hole diameter in the perforated panel (B), hole spacing in the perforated panel (C), porous coir matt thickness (D), density of the porous non-woven (E), porosity (%) of the non-woven (F), percentage of latex added with the non-woven (G), and air gap (H) on sound absorption was discussed in this article. The plan of experiments was determined using the Taguchi L27 experimental design, and the optimization was calculated using S / N ratio analysis. Sample number 24 was found to be an optimized one, and the results show that the optimal combination of process variables and their levels is A3B1C1D1E3F2G3H3. The corresponding optimized NRC value is 0.762. SEM research revealed that the diameter of coir fibers ranges from 120 to 300 µm, while the length of fibers ranges from 80 to 240 mm. Furthermore, the inclusion of latex caused more voids within the surfaces. The influence of all process parameters versus NRC levels was also investigated using univariate ANOVA. The model was significant, and except for porosity percentage, all of the primary effects of individual parameters were significant with NRC value.