| 陈德锦,严谨,罗杨阳,邹律龙.夹层输流管道弹性波频散特征分析[J].声学技术,2021,40(2):167~173 |
| 夹层输流管道弹性波频散特征分析 |
| Analysis of dispersion characteristics of elastic wave in sandwich pipeline |
| 投稿时间：2020-10-28 修订日期：2020-12-10 |
| DOI：10.16300/j.cnki.1000-3630.2021.02.003 |
| 中文关键词: 声固耦合 夹层管道 频散特征 |
| 英文关键词: acoustic-solid coupling sandwich pipeline dispersion characteristics |
| 基金项目:广东省自然科学基金项目（2017A030313275）。 |
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| 摘要点击次数: 652 |
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| 中文摘要: |
| 对无限长夹层输流管道的管壁弹性波频散特征、管内流体声波频散特征，以及弹性体与流体声固耦合的波传播频散特征进行了研究与分析。基于铁木辛柯梁模型构建弹性体管道的波数解析式。考虑声固耦合效应，对无限长夹层输流管道的管壁弹性波与管内流体声波相互耦合的波数和模态振型进行了求解。运用参数化扫描，分别计算了管内流体域为水和空气情况下的频散关系、导波模式，以及不同阶次的截止频率。从分析结果看，夹层输流管道不同介质的频散曲线解析解与数值解基本吻合，超过一定频率，弯曲模态数值解会产生偏差，弹性波模态会发生模态干涉现象。夹层输流管道弹性波频散特征分析为夹层管道故障声检测提供一定的理论依据。 |
| 英文摘要: |
| The dispersion characteristics of the elastic wave in pipeline wall, the acoustic wave in pipeline and the wave propagation of acoustic-solid coupling between elastomer and fluid are studied. Based on Timoshenko beam model, the wavenumber analytical formula of elastic pipeline is derived. Considering the acoustic-solid coupling effect, the wave numbers and mode shapes of the coupling between the elastic wave of pipeline wall and the acoustic wave of fluid in the unlimited length sandwich pipeline are solved. The dispersion relation, guided wave modes, and the cut-off frequencies of different orders under coexistence of water and air in the pipeline are calculated by parametric scanning. From the analysis results, the analytical solution and numerical solution of the dispersion curves of different media in the sandwich pipeline are basically consistent. Over a certain frequency, the numerical solution of bending mode produces deviation, and the elastic wave mode will experiences mode interference. The analysis of the elastic wave dispersion characteristics of sandwich pipelines provides a theoretical basis for acoustic detection of fault in sandwich pipelines. |
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