In order to improve and broaden the sound absorption performance of porous materials with low flow resistance, this study proposes the composite meta-porous structure embedded multiple lateral plates of different lengths, and investigates the corresponding sound absorption coefficients with the fixed and periodic boundary. Characteristics of spatial fluctuation and slow wave effect are embodied in acoustic pressure distributions. Further, the hybrid composite meta-porous structure with periodic boundary could achieve high sound absorption in range of 0–6.4 kHz. The Theoretical model using transfer matrix method suitable for these models is proposed, and verify the FEM results. Normalized surface impedance, phase and trajectory of the complex reflective coefficient illustrates the loss of acoustic energy inside the structure and leakage to the outside. By detailed discussion on the relationship between the geometric parameters and the corresponding sound absorption coefficients, the three boundaries would have different effects on sound absorption performance. Sound absorption test results by acoustic impedance tube confirm the rationality of the composite meta-porous structure with fixed boundary in range of 0.2–5.716 kHz and its practical application in the noise reduction.

为了提高和扩大与低流阻的多孔材料的吸声性能，本研究提出的复合元嵌入多个不同长度的侧板，并调查与固定和周期性边界对应的声音吸收系数-多孔结构。空间波动和慢波效应的特征体现在声压分布中。此外，混合复合材料元具有周期性边界的多孔结构可以在0–6.4 kHz的范围内实现高声吸收。提出了适用于这些模型的，采用传递矩阵法的理论模型，并对有限元结果进行了验证。归一化的表面阻抗，复数反射系数的相位和轨迹说明了结构内部声能的损失以及向外部的泄漏。通过详细讨论几何参数和相应的吸声系数之间的关系，这三个边界将对吸声性能产生不同的影响。吸音测试结果由声阻抗管的确认复合物的合理性的元边界在0.2-5.716 kHz范围内的多孔结构及其在降噪中的实际应用。