Numerical investigation of the effect of mechanical properties of impedance-matched materials with the underwater environment on acoustic absorption using the finite element method.

Document Type : Research Article

Authors

Department of Mechanical Engineering, Tafresh University, Tafresh, Iran

Abstract

In this study, five materials used for the design and manufacture of acoustic absorbers have been investigated. The finite element method has been used with the help of COMSOL software to measure the underwater sound absorption coefficient. The method of creating an axisymmetric simulation to reduce the volume of calculations has been explained; the application of boundary conditions and the generation of acoustic waves have also been investigated, and the effect of the mechanical properties of the materials, including Young's modulus, density, and loss coefficient, on the underwater sound absorption coefficient has been analyzed. The results show that with the increase in the Young's modulus of materials such as nitrile butadiene rubber, which inherently has a low Young's modulus; the sound absorption coefficient in the frequency range of 0.2 to 10 kHz increases significantly compared to other materials. Materials with a high loss coefficient increase the sound absorption coefficient at frequencies below 1 kHz compared to other materials. Materials such as styrene-butadiene rubber, which has a density close to that of water, have a good impedance match with the underwater environment and have excellent sound absorption coefficients in the frequency range of 2 to 10 kHz, which also depends on other material properties.
 

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References

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Amirkabir Journal of Mechanical Engineering
Volume 57, Issue 1
2025
Pages 43-68

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