Journal
JOURNAL OF SOUND AND VIBRATION
Volume 533, Issue -, Pages -Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jsv.2022.116985
Keywords
Rubber coating; Air cavity; Hydrostatic pressure; Underwater sound absorption
Categories
Funding
- National Natural Science Foundation of China [51805537]
- Major Program of the National Natural Science Foundation of China [11991032, 11991034]
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This study proposes a linearization theory for the acoustic scattering process of underwater structure coatings. The theory is validated using finite element analysis and the results show that hydrostatic pressure not only affects cavity deformation but also alters the value of the incremental constitutive tensor, thus influencing the acoustic absorption of the coating.
A rubber layer embedded with air-filled cavities is often used as a coating of underwater structures for acoustic absorption. Previous studies have reported experimental results of the significant effect of hydrostatic pressure on acoustic properties of the acoustic coatings, but theoretical methods and physical mechanisms of the hydrostatic pressure effect have not been studied sufficiently. In this work, a linearization theory is proposed for representation of the acoustic scattering process of the coating with a large static predeformation caused by the hydrostatic pressure. A constitutive model with hyperelasticity and viscoelasticity is employed for characterizing the dynamic behavior of the rubber with a static predeformation. The corresponding numerical method is established by the procedure of finite element analysis and validated by experimental results from acoustic tests with a water-filled pressure tube system. The fields of deformation and incremental constitutive tensor are analyzed in detail for providing a comprehensive understanding of the physical mechanisms of the effects of hydrostatic pressure. As a consequence, the results indicate that not only the deformation of the cavities but also the prestress and predeformation induced change of the value of incremental constitutive tensor affect the acoustic absorption of the coating.
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