吸声型薄膜声学超材料低频宽带吸声性能研究

该文根据吸声型薄膜声学超材料的吸声机理,在传统的吸声型薄膜声学超材料结构的基础上引入质量非对称结构,优化了不同厚度质量片的排布方式,并根据优化结果制备了能够实现低频宽带吸声效果的薄膜声学超材料样品。对其进行声学实验,测试结果显示,样品在100-1000Hz频率范围内的平均吸声系数达0.25,并在250-800Hz频率范围内出现了多个共振吸收峰,且实验测得的吸声系数曲线与仿真曲线的趋势有较高的一致性。因此,该样品实现了低频宽带吸声。

The investigation on low-frequency broadband acoustic absorption performance of membrane sound-absorbing metamaterial

Based on the sound absorption mechanism of membrane sound-absorbing metamaterial, an optimized membrane acoustic metamaterial sample with mass-asymmetric rigid platelets was prepared on the basis of the structure of traditional sound-absorbing metamaterial, and its acoustic absorption performance was tested by using an acoustic impedance tube test system. The experimental results show that the average sound absorption coefficient of the sample reaches 0.25 in the frequency range of 100 - 1000 Hz, and several resonance absorption peaks appear in the frequency range of 250 - 800 Hz, and the trend of the sound absorption coefficient curve measured by the experiment is relatively consistent with that of the simulation curve. Therefore, the sample realizes low frequency broadband sound absorption.