水下八格空气腔角反射体声散射特性

褚子超; 罗祎; 文无敌

doi:10.11993/j.issn.2096-3920.202204012

水下八格空气腔角反射体声散射特性

doi: 10.11993/j.issn.2096-3920.202204012

海军工程大学兵器工程学院, 湖北武汉, 430033

详细信息

作者简介:
褚子超(1997-), 男, 硕士, 主要研究方向为兵器工程

中图分类号: TJ630; U666.7; TB566
计量
- 文章访问数: 110
- HTML全文浏览量: 9
- PDF下载量: 21
- 被引次数: 0
出版历程
- 收稿日期: 2022-04-20
- 修回日期: 2022-08-03
- 网络出版日期: 2022-11-03

Acoustic Scattering Characteristics of Underwater Eight-grid Air-filled Cavity Corner Reflector

School of Weaponry Engineering, Naval University of Engineering, Wuhan 430033, China

摘要

摘要: 水下角反射器具有较强的回波特性, 可用于标记水下结构、模拟水下假目标等, 针对单格角反射器反射范围具有局限性等不足, 设计了一种新的八格空气腔角反射体。采用有限元-边界元法, 对八格空气腔角反射体和单格空气腔角反射器的声散射特性进行仿真对比, 分析了八格角反射体由于多格带来的影响, 以及改变声源的入射角度、入射波频率和空气腔厚度等因素对八格空气腔角反射体散射声场的影响。结果表明: 八格空气腔角反射体散射范围大、具有更大的散射强度, 有效弥补了单格空气腔角反射器散射强度低、存在反射盲区等问题; 多格之间的相互影响能有效增大散射宽度; 由于结构的振动会形成较大范围的散射声场; 在不同入射声波频率条件下改变空气腔的厚度对其目标强度无明显影响。
- 水下角反射器 /
- 空气腔 /
- 目标强度 /
- 声散射特性
Abstract: Underwater corner reflectors have a strong acoustic scattering ability and can be used to mark underwater structures and simulate underwater false targets. In accordance with the limitation of the reflection range of a single-grid corner reflector, a new eight-grid air-filled cavity corner reflector was designed. The acoustic scattering characteristics of the eight-grid air-filled cavity corner reflector and single-grid air-filled cavity corner reflector were simulated and compared using the finite element method-boundary element method. The effect of the eight-grid corner reflector due to multiple grids and the effects of changing the incident angle, frequency of incident wave, and air-filled cavity thickness on the eight-grid air-filled cavity corner reflector scatter sound field were analyzed. The results show that the eight-grid air-filled cavity corner reflector has a larger scattering range and greater target intensity, effectively compensating for the problems of low scattering intensity and reflection blind area of the single-grid air-filled cavity corner reflector. The interaction between multiple grids can effectively increase the scattering width, resulting in the formation of a wide range of scattered sound fields due to structural vibrations. Changing the thickness of the air-filled cavity under different incident sound wave frequencies does not have a significant effect on the target strength.
- underwater corner reflector /
- air-filled cavity /
- target strength /
- acoustic scattering characteristic

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图 1 内含填充物的水下弹性壳体

Figure 1. Underwater elastic shell with filler

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图 2 模型开发窗口

Figure 2. Model development window

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图 3 角反射体模型

Figure 3. Corner reflector model

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图 4 空气腔薄板示意图

Figure 4. Schematic diagram of air-filled cavity plate

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图 5 声波入射示意图

Figure 5. Schematic diagram of sound wave incidence

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图 6 不同空气腔厚度的目标强度

Figure 6. Target strength for different air cavity thicknesses

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图 7 θ=90°和φ=0°~360°时的目标强度

Figure 7. Target strength at θ=90° and φ=0° ~360°

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图 8 φ=45°和θ=0°~90°时的目标强度

Figure 8. Target strength at φ=45° and θ=0°~90°

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图 9 散射声场

Figure 9. Scattering sound field

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表 1 材料参数表

Table 1. Table of material parameter

材料杨氏模量/Pa 泊松比声速
/(m·s⁻¹) 密度
/(kg·m⁻³)

水 — — 1 480 1 000
钢 2.1×10¹¹ 0.3 — 7 800
空气 — — 340 1.29

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