Song Boqi, Peng Limin, Fu Feng, Liu Meihong, Zhang Houjiang
Key Laboratory of Wood Science and Technology of State Forestry Administration, Research Institute of Wood Industry, Chinese Academy of Forestry, Beijing 100091, China.
School of Technology, Beijing Forestry University, Beijing 100083, China.
Materials (Basel). 2016 Nov 22;9(11):942. doi: 10.3390/ma9110942.
Perforated wooden panels are typically utilized as a resonant sound absorbing material in indoor noise control. In this paper, the absorption properties of wooden panels perforated with tiny holes of 1-3 mm diameter were studied both experimentally and theoretically. The Maa-MPP (micro perforated panels) model and the Maa-Flex model were applied to predict the absorption regularities of finely perforated wooden panels. A relative impedance comparison and full-factorial experiments were carried out to verify the feasibility of the theoretical models. The results showed that the Maa-Flex model obtained good agreement with measured results. Control experiments and measurements of dynamic mechanical properties were carried out to investigate the influence of the wood characteristics. In this study, absorption properties were enhanced by sound-induced vibration. The relationship between the dynamic mechanical properties and the panel mass-spring vibration absorption was revealed. While the absorption effects of wood porous structure were not found, they were demonstrated theoretically by using acoustic wave propagation in a simplified circular pipe with a suddenly changed cross-section model. This work provides experimental and theoretical guidance for perforation parameter design.
穿孔木板通常用作室内噪声控制中的共振吸声材料。本文通过实验和理论研究了直径为1 - 3毫米的微小孔穿孔木板的吸声特性。应用Maa - MPP（微穿孔板）模型和Maa - Flex模型来预测细穿孔木板的吸声规律。进行了相对阻抗比较和全因子实验以验证理论模型的可行性。结果表明，Maa - Flex模型与测量结果吻合良好。进行了对照实验和动态力学性能测量以研究木材特性的影响。在本研究中，吸声特性通过声致振动得到增强。揭示了动态力学性能与面板质量 - 弹簧振动吸收之间的关系。虽然未发现木材多孔结构的吸声效果，但通过在具有突然变化横截面模型的简化圆形管道中使用声波传播从理论上进行了证明。这项工作为穿孔参数设计提供了实验和理论指导。
