Abstract: The effects of high pressure on a nanocomposite coating named PSM with high acoustic absorption coefficient only under normal hydrostatic pressure were investigated. To improve the underwater sound absorption properties of PSM under high pressure, a shell structure was proposed to minimize the pressure effects on PSM by a hard shell combined with a soft layer whose superior sound absorption performance was maintained under high hydrostatic pressures. FEM simulation and compression experiments show that 2 mm thick epoxy as the hard shell enhances the compression strength of PSM, and 2 mm thick Ecoflex absorbs the residual deformations in the center. The underwater acoustic tests show that the underwater sound absorption coefficient of PSM with epoxy and Ecoflex as the protection is from 0.2 to 0.7 in a frequency range of 1500~7000 Hz under high pressure as 1.5 MPa.

Key words: thin shell, nanocomposite coating, underwater sound absorption, deep-sea high pressure

摘要： 研究了压力对纳米复合涂层PSM的影响，发现它仅在常压下具有很好的水下吸声性能。为提高PSM在高压下的吸声性能，提出了一种能够消除压力对PSM影响的硬壳软内衬薄壁结构。FEM仿真和压缩试验发现，2 mm厚的环氧树脂硬壳增强了PSM的抗压性能，2 mm厚的软硅橡胶Ecoflex内衬可以进一步减小中间区域形变。水声测试验证表明，在静水压力1.5 MPa下，带环氧树脂硬壳和Ecoflex软内衬的PSM在1500~7000 Hz区间的平均吸声系数从0.2提高到0.7。

关键词: 薄壁, 纳米复涂层, 水下吸声, 深海高压