| 吴健,李泓运,王纬波.蛋形仿生耐压壳水下声辐射特性研究[J].声学技术,2020,39(3):272~278 |
| 蛋形仿生耐压壳水下声辐射特性研究 |
| Research on underwater acoustic radiation performance of bionic egg-shaped pressure hull |
| 投稿时间：2019-01-15 修订日期：2019-02-15 |
| DOI：10.16300/j.cnki.1000-3630.2020.03.003 |
| 中文关键词: 蛋形 球形 耐压壳 三维水弹性 声辐射 |
| 英文关键词: egg-shaped spherical pressure hull three dimensional hydroelasticity acoustic radiation |
| 基金项目:国家重点研发计划资助项目（2016YFC0304303）。 |
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| 中文摘要: |
| 以直径2 m、工作水深4 km的钛合金球壳为对象，通过Narushin（N-R）方程描述鹅蛋、鸡蛋、鸵鸟蛋的形状函数，采用等容积、等最大应力水平的方法设计了仿生耐压壳体，通过有限元方法分析各壳体在空气中和水中的模态特性，最后利用三维水弹性方法计算蛋形仿生耐压壳体的远场声辐射。计算结果表明，在500 Hz以下频段，蛋形壳在尖端和钝端激励时引起的声辐射要优于球壳，其中鹅蛋型曲线的耐压壳体具有较优的辐射噪声特性。在500 Hz以上频段，球壳的辐射噪声远低于蛋形壳。激励位置对蛋形耐压壳体声辐射影响明显，分析结果可为低噪声水下仿生耐压壳结构设计应用提供有效参考。 |
| 英文摘要: |
| A titanium alloy spherical pressure hull with the diameter of 2 m and working depth of 4 km is taken as the design object. Shape functions of goose eggshell, chicken eggshell and ostrich eggshell are described by Narushin (N-R) equation. The bionic pressure hulls are designed by the method of equal volume and equal maximum stress level, and the dry mode and wet mode of each hull are analyzed by finite element method. Three dimensional hydroelasticity theory is used to calculate the far-field acoustic radiation of bionic egg-shaped pressure hulls. Results show that the egg-shaped pressure hulls excited at sharp point and blunt point have better acoustic radiation performance than spherical shell, and the goose egg-shaped shell has the best acoustic radiation performance at the frequency below 500 Hz. The acoustic radiation of spherical shell is much lower than that of the egg-shaped shell at the frequency above 500 Hz. The position of excitation has significant effect on acoustic radiation performance of egg-shaped pressure hull. Results can provide an effective guidance for the design and application of low noise bionic egg-shaped pressure hulls. |
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