In this study, two-dimensional finite-difference time-domain analysis was used to investigate sound transmission loss (STL) of porous materials with different incident angles. This method has provided evidence for the feasibility of measuring STL in situ using one particle velocity–pressure sensor and one pressure sensor. In the numerical analysis, the total sound pressure and the vertical component of the total particle velocity at the incident side of the material were used to separate incident and reflected components. The STL was calculated using the separated sound pressure at the incident side and the sound pressure at the transmitted side of the porous material. The STL calculated from simulation agrees with theoretical values at all incident angles investigated.

在这项研究中，使用二维有限差分时域分析来研究具有不同入射角的多孔材料的声传输损耗（STL）。这种方法为使用一个粒子速度压力传感器和一个压力传感器原位测量STL的可行性提供了证据。在数值分析中，材料的入射侧的总声压和总粒子速度的垂直分量用于分离入射分量和反射分量。使用多孔材料在入射侧的分离声压和透射侧的声压计算STL。通过仿真计算得出的STL与研究的所有入射角的理论值均吻合。