In the present study, Taguchi design of experiments (DOEs) L₁₈ orthogonal array has been used for the investigation of the mechanical behavior of rigid polyurethane foam (RPUF) composites. The outcome of the process parameters such as polyol, filler, surfactant, catalyst, blowing agent, and anti-flaming agent on the mechanical properties, such as tensile, flexural, and compressive strengths and hardness (Shore D) of RPUF composites, has been examined, and the resulted data were analyzed by means of Taguchi design of experiments. The raw data for the average values of the mechanical properties and the signal-to-noise (S/N) ratio for each parameter were evaluated at three levels, and the analysis of variance (ANOVA) and optimum process parameters are determined. The confirmation experiments were performed for the validation of the improved performance and to measure the contribution of individual parameter on the responses. The confirmation experiments revealed the average tensile strength, average compressive strength, average flexural strength, and average hardness (Shore D) as 5.24 MPa, 6.37 MPa, 12.28 MPa, and 72.43, respectively, which fall within the 95% confidence interval of the anticipated optimum process parameters.

在本研究中，田口实验设计 (DOE) L ₁₈正交阵列已用于研究硬质聚氨酯泡沫 (RPUF) 复合材料的机械性能。多元醇、填料、表面活性剂、催化剂、发泡剂和阻燃剂等工艺参数对 RPUF 复合材料的拉伸、弯曲、压缩强度和硬度 (Shore D) 等机械性能的影响检查，并通过田口实验设计分析所得数据。每个参数的机械性能平均值和信噪比 (S/N) 的原始数据在三个水平上进行评估，并确定方差分析 (ANOVA) 和最佳工艺参数。进行确认实验以验证改进的性能并测量单个参数对响应的贡献。确认实验显示平均拉伸强度、平均压缩强度、平均弯曲强度和平均硬度 (Shore D) 分别为 5.24 MPa、6.37 MPa、12.28 MPa 和 72.43，落在预期的 95% 置信区间内最佳工艺参数。