海战场对抗环境下敷设粘弹性阻尼层目标的声隐身性能分析

Analysis of the acoustic stealth properties of objects coated with viscoelastic damping layer under sea battle-field antagonism environment

基于敌方潜艇使用艇载声呐探测我水下航行器时的假想情况,综合考虑海战场对抗环境,计算水下球形壳体目标的声散射特性和在壳体外敷设粘弹性材料阻尼层后的声散射特性。进一步,利用被敌发现概率评估水下航行器的隐身性能,给出一种海战场环境中水下航行器水声对抗特性评价方法。计算发现,敷设粘弹性阻尼层后目标强度在大半部分分析频段上均有一定程度的降低,特别是低频段的水下目标声对抗特性有了较大的提高。因此,敷设粘弹性阻尼层可以在一定程度上降低水下目标声散射强度,改善水下目标的声隐身性能。

Based on the assumed scene that the enemy submarine using the ship-based sonar to detect our underwater vehicles under the sea battle-field antagonism environment,the current work carries out the calculation of sound scattering characteristics of an underwater spherical shell with and without a damping layer of viscoelastic material.Further,the detection probability is utilized to estimate the acoustic stealth performance of the underwater vehicle,thereby an evaluation method of countermeasure characteristics is proposed.The calculation results show that the target intensity of the underwater vehicle could be reduced to a certain extent in most of the analysis frequency bands,especially in the low frequency range,the countermeasure characteristics of the underwater target could be effectively improved.Therefore,the strategy of treating the underwater target with viscoelastic damping material layer help to reduce the sound scattering intensity of underwater targets in a certain extent and to strength the stealth performance of underwater targets.