局部敷设声学覆盖层的圆柱壳体声目标强度分析

马琪; 倪世丰; 耿浩; 杨海滨

doi:10.11993/j.issn.2096-3920.2024-0105

局部敷设声学覆盖层的圆柱壳体声目标强度分析

doi: 10.11993/j.issn.2096-3920.2024-0105

马琪^1,,
倪世丰^1,,
耿浩^1,,
杨海滨^{2, 3,}

1.
海装广州局, 云南昆明, 650011
2.
国防科技大学智能科学学院, 湖南长沙, 410073
3.
国防科技大学装备状态感知与敏捷保障全国重点实验室, 湖南长沙, 410073

详细信息

作者简介:
马琪：马　琪(1976-), 男, 高级工程师, 主要研究方向为水中兵器综合性能评估与监造

中图分类号: U668.5; TJ630
计量
- 文章访问数: 9
- HTML全文浏览量: 5
- PDF下载量: 2
- 被引次数: 0
出版历程
- 收稿日期: 2024-06-04
- 修回日期: 2024-07-19
- 录用日期: 2024-08-06
- 网络出版日期: 2025-01-22

Investigation of acoustic target strength of a cylindrical shell partially coated with anechoic layers

MA Qi^1
,,
NI Shifeng^1
,,
GENG Hao^1
,,
YANG Haibin^{2, 3
,}

1.
Guangzhou Naval Representative Bureau, Kunming 650011, China
2.
College of Intelligence Science and Technology, National University of Defense Technology, Changsha, 410073, China
3.
National Key Laboratory of Equipment State Sensing and Smart Support, National University of Defense Technology, Changsha, 410073, China

摘要

摘要: 水下装备主要壳体构型为圆柱壳体结构, 为研究局部敷设声学覆盖层的圆柱壳体声目标强度特性, 以内嵌横向柱形空腔结构的声学覆盖层为分析对象, 基于Kirchhoff-Helmholtz散射积分公式, 通过柱面微元的二维近似及轴向积分, 建立了局部敷设声学覆盖层有限圆柱壳体声目标强度的降维分析方法, 大幅降低计算复杂度。利用该方法, 进一步分析了声学覆盖层对圆柱壳体声目标强度的控制规律。结果表明, 在局部敷设情况下, 覆盖层的本体吸声, 覆盖层与壳体的耦合共振, 以及不同区域之间的散射波相消干涉等效应均可显著降低壳体声目标强度。通过敷设区域的调控, 可获得吸声效应以外的声目标强度控制效果, 为覆盖层工程应用设计提供有益参考。
- 声学覆盖层 /
- 圆柱壳体 /
- 声目标强度
Abstract: In order to study the characteristics of the acoustic target strength of a cylindrical shell partially coated with anechoic layers, a dimensionality reduction method is proposed for analysis of the anechoic coating embedded with transverse cylindrical cavities, greatly reducing computational complexity. Based on the Kirchhoff-Helmholtz integral formula, the dimensionality reduction method is established through two-dimensional approximation and axial integration of differential elements of the cylinder. Using this method, the target strength reduction properties of the anechoic coating to the cylindrical shell is further analyzed. The results show that in the case of partially coated shell, the sound absorption of the anechoic coating, the coupling resonance between the coating and the shell, and the cancellation interference between the scattering waves from different regions can significantly reduce the target strength. As a consequence, the target strength reduction beyond the sound absorption effect can be achieved by regulating the coating area, which provides useful reference for the engineering applications of anechoic coatings.
- anechoic coating /
- cylindrical shell /
- acoustic target strength

HTML全文

图 1 局部敷设声学覆盖层圆柱壳体模型

Figure 1. Model of a finite cylindrical shell partially coated with anechoic layers

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图 2 圆柱壳体模型声目标强度(三维模型与降维模型计算结果比较)

Figure 2. Results of 3D and 2D models for computing the acoustic target strength of a finite cylindrical shell

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图 3 声学覆盖层的吸声系数$\alpha $与反射强度$10\log \left( {1 - \alpha } \right)$

Figure 3. Absorption coefficients and reflection strength of an anechoic coating

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图 4 声学覆盖层在3 950 Hz频率处的位移场及功率耗散密度分布

Figure 4. Displacement and power dissipation density of the anechoic layer at 3950 Hz

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图 5 橡胶基体中单个空腔的吸收截面

Figure 5. The absorption cross section of the single cavity in the rubber matrix

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图 6 局部敷设声学覆盖层圆柱壳体的声目标强度(考虑敷设覆盖角度分别为60°、120°和全敷设)

Figure 6. Acoustic target strength of the cylindrical shell partially coated with anechoic layers

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图 7 入射声波作用下局部敷设声学覆盖层壳体的吸收截面

Figure 7. Acoustic absorption cross-sections of the partially coated shells

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图 8 壳体瞬态散射声压分布(5 800 Hz)

Figure 8. Instantaneous scattered sound pressure fields of the partially coated shells at 5800 Hz

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图 9 覆盖层60°敷设情况下覆盖层边缘±5°射线(OA和OB)上瞬态散射声压分布(5 800 Hz)

Figure 9. Instantaneous scattered sound pressure fields on the ± 5 ° rays from the edge of the coating (OA and OB ) for the case of $\psi $=60°

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