Multi-objectives optimisation of PU foams on acoustic performance by using design of experiment

The main objective of this study was to obtain an optimal formulation of PU foams with improved acoustic properties by using design of experiment (DOE). With the aim to obtain an efficient acoustic material, the PU foams formulation can be optimised successfully by adjusting the content of various additive components in this experiment. The experiments were conducted with four controllable three-level factors and two target objectives, and Taguchi's orthogonal array L9(34) had been chosen. The various additive components were: water (3.8-4.8 part by weight), tri-ethanolamine (TEA, 2-3 part by weight), HCFC-141b (4-6 part by weight) and A33 (0.9-1.1 part by weight). Sound absorption coefficient and transmission loss were both chosen as target objectives. The best formulation that optimised the acoustic properties of PU foams were determined by analysis of variance (ANOVA). From the results, the most significant factor affecting the experimental design objectives was identified.