Abstract
Anechoic linings are vital for maritime applications in reducing the underwater radiated noise. The design of such a lining necessarily encapsulates scatterers distributed inside a viscoelastic material. The suitability of functionally graded viscoelastic materials to such applications has not been fully exploited. The present paper focuses on development of an optimized acoustic lining for various applications. A transfer matrix based analytical model has been formulated and has been validated numerically, followed by optimization of the material properties using genetic algorithm and a novel optimization tool based on weight functions. Results show that such materials are effective in obtaining the desired acoustic characteristics. Further, they are found to be retaining their performance under hydrostatic pressures. The effect of thickness of various layers and configurations has been discussed.
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