基于声学边界元法，对一艘支线集装箱船的低频水下辐射噪声进行预报研究，对比流固耦合法和声固耦合法这2种不同耦合方法对水下辐射噪声预报的影响。分别以场点声压级和辐射声功率级的谱级和1/3倍频程频带级为考核量，对比预报结果得出如下结论：2种耦合方法的预报结果具有相似的趋势，由于流固耦合法忽略了海水的可压缩性，没有考虑海水压缩带来的阻尼效应，因此其预报结果基本大于声固耦合法的预报结果。在船舶水下辐射噪声预报的实际工程应用中，当频率较低时，两种耦合方法的预报结果误差满足工程精度要求（3 dB），因此可根据实际情况自由选择耦合方法；当频率较高时，使用流固耦合法的预报结果可能会偏高，预报过于保守，建议使用声固耦合法。
Based on acoustic boundary element method the low-frequency underwater radiated noise of a feeder container ship is predicted and studied, comparing the influence of fluid-structure coupling and acoustics-structure coupling on prediction of ship underwater radiated noise. Taking the spectral level and 1/3 octave band level of field points’ sound pressure and radiated sound power as the assessment quantities, the following conclusions are obtained by comparing the prediction results. The results of two coupling methods have a similar trend. The compressibility of seawater is ignored and the damping effect caused by seawater compression has not been considered in fluid-structure coupling method, thus its results are almost greater than those of acoustic-structure coupling method. In the practical engineering application of ship underwater radiated noise prediction, the coupling method can be freely selected according to the actual situation as the errors of two coupling methods are less than the engineering accuracy requirements (3 dB) when the frequency is low. When the frequency is high, acoustic-structure coupling method is recommended as the result of fluid-structure coupling method may be high and its results are too conservative.
2024,46(18): 82-86 收稿日期：2023-12-8
DOI：10.3404/j.issn.1672-7649.2024.18.014
分类号：U661.44
作者简介：刘依明(1991-),女,硕士,工程师,研究方向为船舶振动噪声
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