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水下弹性共振腔低频宽带吸声特性研究

Study on low frequency broadband sound absorption characteristics of underwater elastic resonator

  • 摘要: 基于水下共振腔低频宽带吸声特性,在传统声学材料的基础上,本文利用弹性薄膜改变腔体内部模态声场特征,通过分析薄膜的材料、厚度与层数等参数变化及附加质量块对传递损失的影响规律,设计了一种多模弹性共振腔阵列与声学覆盖层的组合模型。模型试件测试结果表明,相比于传统消声结构,多模弹性共振腔阵列组合装置在800 Hz附近吸声系数大于0.8,在1 kHz以下低频段内具有较好的吸声效果。

     

    Abstract: Based on the low-frequency broadband sound absorption characteristics of underwater resonant cavities and building upon traditional acoustic materials, this paper employs elastic films to alter the modal sound field characteristics inside the cavity. By analyzing changes in parameters such as the material, thickness, and number of layers of the films, as well as the influence of additional mass blocks on transmission loss, a combined model consisting of a multi-mode elastic resonant cavity array and an acoustic covering layer is designed. Test results of the model specimens show that, compared with traditional noise reduction structures, the multi-mode elastic resonant cavity array combination device achieves a sound absorption coefficient greater than 0.8 near 800 Hz and demonstrates superior sound absorption performance in the low-frequency band below 1 kHz.

     

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