敷设阻尼薄板隔声性能的测试与计算分析

首先,采用脉冲响应衰减法测试了敷设阻尼薄板的阻尼损耗因子,分析了阻尼敷设比例及薄板的悬挂状态对薄板阻尼损耗因子的影响;其次,在混响-全消室中测试了敷设阻尼薄板的隔声量,比较了不同阻尼敷设比例薄板的测试结果;最后,建立了敷设阻尼薄板隔声量计算分析模型,隔声量计算值与试验值吻合较好,验证了计算模型的有效性。研究了敷设阻尼材料厚度与敷设比例对薄板结构隔声性能的影响,综合考虑轻量化和隔声性能,分析了阻尼材料厚度与敷设比例对薄板降噪效率的影响,并以降噪效率最大为目标进行了薄板隔声特性的优化。

Measurement and Computational Analysis of Sound Insulation Performance of a Plate with Damping Treatment

The damping loss factor of a plate with damping treatment is measured by the impulse response method. The influence of the coverage ratio of the damping and the test condition on the damping loss factor of a plate is analyzed. The sound insulation of the plate is tested using anechoic-reverberation chamber, and the test results of the plate with different coverage of the damping material are compared. The calculation model of the sound insulation of the plate is established. The calculated values are in good agreement with the experimental data, which proves the validity of the model. Based on this model, the influence of the thickness and coverage of the damping material on the sound insulation performance of the structure is studied. Considering the characteristics of lightweight and sound insulation, the influence of the thickness and coverage of the damping material on the noise reduction efficiency is analyzed and the noise reduction optimization is carried out with the goal of maximizing the noise reduction efficiency.