集成统计能量法计算声呐自噪声水动力噪声分量

针对舰船艏部非规则形状声呐罩的自噪声预报,借鉴集成模态法思路1,2],采用虚拟弹性膜技术,建立集成统计能量法(Integro-SEA),并以矩形腔声呐罩为例验证计算精度.在此基础上,采用集成统计能量法计算舰船艏部声呐自噪声的水动力噪声分量,并修正计算艏部边界层转捩区湍流猝发声源对声呐自噪声的作用.研究表明:用经典SEA和集成SEA方法计算矩形腔声呐罩自噪声,偏差小于1dB,集成SEA方法加边界层转捩区声源修正,计算的舰船艏部声呐自噪声与实艇测试结果比较,在200Hz～6kHz的中频范围内相差2～3dB.

Calculation of hydrodynamic component of sonar self-noise by integro-SEA method

In order to predict sonar self-noise inside the sonar dome of irregular form in the fore-body of submarines,the Integro-SEA method is established by applying the idea of integro-modal approach and the technique of virtual elastic membrane.The hydrodynamic self-noise of a rectangular sonar dome model is calculated to examine the accuracy of the Integro-SEA method.Then,the hydrodynamic self-noise of the sonar dome in the fore-body of a submarine is calculated,and the effect of trubulence boundary layer transition is also included.By the comparison of the self-noise of rectangular sonar dome,the difference between the results obtained by the classical SEA and the Integro-SEA is less than 1dB.When both of the Integro-SEA method and the modification of transition noise were considered,the difference between the calculated and the measured hydrodynamic self-noise component of a sonar dome in the fore-body of a submarine is about 2-3dB in the frequency range of 200Hz-6kHz.