针对舰船低频域水下辐射噪声计算问题，指出采用严格遵循声固耦合动力学方程的耦合声学有限元与远场自动匹配层（FEM/AML）方法以及耦合声学间接边界元（IBEM）方法是计算精度较高的策略。以某小水线面双体船（SWATH）为研究对象，使用声功率作为评价指标，探讨了声场区域特征尺度选取对计算精度的影响，比较了上述两种方法与常规基于流固耦合的两种方法在计算特性方面的差异。研究表明，声固耦合模式较流固耦合模式声学响应计算结果偏小，对于本文SWATH船的合成总声功率级两者偏差达到1-3 dB，前者计算结果更为精确，基于声固耦合模式的耦合声学IBEM方法是舰船水下辐射噪声预报的首选算法。
Abstract
Aiming at ship underwater sound radiation calculation problems in low frequency domain, adopting the vibro-acoustic FEM/AML and the vibro-acoustic IBEM is the strategy with higher calculation accuracy based on vibro-acoustic coupling dynamic equations strictly. Taking a small waterplane area twin hull (SWATH) as a computational example, the influences of size selection for sound field surrounding the hull in vibro-acoustic coupling computing model were studied. Taking sound power as an evaluation index, the difference in computing properties between aforementioned vibro-acoustic coupling method and the conventional fluid-structure interaction method was discussed. The study showed that the acoustic response computing results in vibro-acoustic coupling mode are smaller compared with those in fluid-structure interaction mode, the former is more accurate; the deviation between SWATH ship’s synthetic whole sound power levels obtained in the two modes reaches 1-3 dB; the vibro-acoustic IBEM based on vibro-acoustic coupling mode is the preferred method for ship underwater sound radiation prediction.
关键词
舰船 /
振动 /
噪声 /
声固耦合 /
流固耦合 /
水下辐射噪声
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Key words
ship /
vibration /
noise /
vibro-acoustic coupling /
fluid-structure interaction /
underwater sound radiation
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