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

Abstract

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.

Keywords

• havriliak-negami model
• viscoelastic material
• sound absorption performance
• layered medium model
• optimization