目标壳体高频亮点回波结构的近似方法与分析

利用几何声线法分离了目标壳体高频亮点回波结构的精确解,结合波动理论建立了水下敷粘弹性材料多层壳体的近似模型,即通过等效的2层单层壳体的组合近似多层壳体,并推导了模型的亮点回波结构.通过分析不同情况下近似模型的回波构成,并与精确解相对比,验证了近似模型的可行性,也给出了目标回波构成与材料、频率之间的关系,以及壳体各部分在回波中的作用.分析结果表明,当损耗因子较大或频率较高时,反射回波的主要成分是吸声材料与环境介质间的回波,这为水中小目标的隐身设计提供了基础.最后,以聚脲为吸声材料验证文中结论的正确性.

Approximation Method and Analyse of Highlight Echoes from Target Shells With High Frequency

The highlight echoes structure with high frequency from small immerged target was provided using ray acoustics at first.In use of wave theory,the approximate model of multi-layer target covered with viscoelastic material and its echoes structure were established by means of combined single shells.By the contrasting approximation echoes with the exactness,the relationship between target echoes and absorption materials was provided as well as the each part contribution of the target.The analysis results show that the absorption materials play a main role in target echoes with high frequency or large loss factor.Finally,taking spray poiyurea elastomer as an example,the correctness of conclusion in this paper was validated.