约束层阻尼对飞机壁板隔声特性的影响

摘要

约束层阻尼是飞机舱壁结构减振降噪的常用材料。为快速预计敷贴约束层阻尼的飞机壁板的隔声特性，以声阻抗管条件下均匀板传声损失测试结果和有限元模型计算结果为依据，分析约束层阻尼的质量、阻尼损耗因子及约束层厚度对板传声损失的影响效果，进而在混响室-全消声室条件下测试有限尺寸飞机壁板模型敷贴约束层阻尼板的隔声量。验证了基于阻抗管中获得约束层阻尼参数与整体传声损失的关系可用于预计飞机壁板敷贴约束层阻尼后的隔声特性。%The constrained layer damping (CLD) is a typical material which is extensively applied to suppress vibration and noise in aircraft engineering. In order to quickly predict the effects of CLD patches on the sound insulation of aircraft panels, the CLD parameters, such as the mass distribution of each layer, the damping loss factor and the thickness of the constrained layer, on the sound insulation performance of a small uniform panel are investigated by comparing the sound transmission loss measured and calculated in the environment of a sound impedance tube. Then, the study of a real aircraft panel with CLD patches attached is carried out to verify the effectiveness of the prediction method. Hence, the relationship between the CLD parameters and the sound transmission loss of the composite panel measured in the sound impedance tube can be applied to predict the sound insulation performance of the aircraft panels.