基于Havriliak-Negami模型的黏弹性材料吸声性能优化

Optimization of sound absorption performance of viscoelastic material based on Havriliak-Negami model

通过构建Havriliak-Negami模型并使用分层介质模型对黏弹性材料的动态力学参数进行优化,以提升其低频吸声性能。研究结果表明,在频率为1~6 kHz内、厚1 cm钢背衬条件下,厚5 cm橡胶材料的复杨氏模量优化后可实现平均吸声系数达到0.90。同等厚度条件下,具有不同驰豫时间的多层橡胶材料优化后可实现更加均匀的有效吸声。

The dynamic mechanical parameters of viscoelastic materials were optimized by the Havriliak-Negami(H-N)model and the layered medium model so as to improve the acoustic absorption performance of viscoelastic materials in low frequency.The results showed that in the range of 1 kHz and 6 kHz and under the condition of steel plate thickness of 1 cm,the complex Young′s modulus of the rubber material thickness of 5 cm could be optimized to achieve an average sound absorption coefficient of 0.9.Under the condition of the same thickness,multiple-layered rubber with different rela-xation times could be optimized to achieve more uniform and effective sound absorption performance.