Fabrication of microperforated panel (MPP) using an additive manufacturing (AM) process produced imperfect perforations with an irregular shape, inconsistent size, and rough inner surface (due to burr formation). This imperfect hole condition leads to a significant deviation between measured and modeled acoustic properties. This study aims to introduce the resistance end correction factor ($\alpha$) for quantifying this deviation. The MPP model’s current development excludes the irregular and inconsistent holes from the actual MPP. The improved resistance end correction factor ($\alpha$) is determined based on the actual MPP samples. The MPP’s acoustic properties fabricated using AM process (3D Printing – PolyJet technology) are measured. The improved resistance end correction factor ($\alpha$) is presented in surface plots for different geometrical parameters, perforation diameter ($d$), plate thickness ($t$), and perforation ratio ($\sigma$). The interpolation method is used to predict the “$\alpha$” value based on the surface plot. The improved relative acoustic resistance value for the actual MPP sample with imperfect perforation condition (with recorded lowest hole roundness value at 0.207) is calculated using the predicted “$\alpha$” value. Comparative results showed that the improved relative acoustic resistance determined based on the interpolated “$\alpha$” agreed well with the experimental measurement results. The correlation coefficient for each comparison varied from 0.885 to 0.987. This finding is better than comparing calculated relative acoustic resistance values by using Maa’s theory and other MPP models with different proposed resistance end correction factors ($\alpha$). Therefore, the proposed technique can reflect the imperfect perforation condition in actual MPP samples.

使用增材制造 (AM) 工艺制造微穿孔板 (MPP) 会产生形状不规则、尺寸不一致和内表面粗糙（由于毛刺形成）的不完美穿孔。这种不完美的孔条件导致测量的和模拟的声学特性之间存在显着偏差。本研究旨在引入电阻端修正系数（$\alpha$) 来量化这种偏差。MPP 模型目前的发展从实际 MPP 中排除了不规则和不一致的孔。改进的电阻端修正系数（$\alpha$) 是根据实际 MPP 样本确定的。测量了使用 AM 工艺（3D 打印 – PolyJet 技术）制造的 MPP 的声学特性。改进的电阻端修正系数（$\alpha$) 以不同几何参数、穿孔直径 ($d$), 板厚 ($吨$), 和穿孔率 ($\sigma$）。插值方法用于预测“$\alpha$”值基于曲面图。使用预测的“$\alpha$“ 价值。比较结果表明，基于插值的“$\alpha$”与实验测量结果非常吻合。每个比较的相关系数从 0.885 到 0.987 不等。这一发现优于使用 Maa 理论和其他具有不同建议阻力端修正系数的 MPP 模型来比较计算出的相对声阻值（$\alpha$）。因此，所提出的技术可以反映实际 MPP 样品中不完美的穿孔条件。