粘弹性和压电材料对水下噪声的衰减机制

: Both the reflections of incident acoustic signature from an underwater body and the radiations from internal noise source may be suppressed by coating viscoelastic or piezoelectric material on the steel shell. This technology may be used to enhance naval underwater vehicle's stealth properties, and may also be applied in other military and civil areas. As preliminary research, we developed and improved the procedure to evaluate the noise reduction for the underwater laminated viscoelastic plates and laminated piezoelectric plates, and investigated the mechanism of noise reduction and evaluated the influence of varying parameters. The work constructed a solid base for the further research.

采用粘弹性材料或压电材料覆盖水下物体既可以减小其对外来声波的反射也可以抑制其内部声源的辐射。此项减噪技术不仅能够显著地提高海军潜水物体的声学隐密性，并且也可以被应用到其它的军事和民用领域。本项目拟采用理论和数值方法对水下覆盖层减噪的机理及参数影响规律进行系统的研究，为此项技术的实际应用奠定必要的理论基础。