FE-SEA方法在平台支持船噪声预报中的应用

平台支持船由于作业需要通常配备有动力定位系统,其在侧推工况下舱室噪声超标较为严重。针对这个问题采用计算流体力学(CFD)方法,得到侧推螺旋桨作用在导管上的脉动压力,并将时域计算结果转换成噪声计算的激励条件。采用有限元(FE)与统计能量分析(SEA)混合方法建立船体中频段FE-SEA耦合模型并建立船体高频段SEA模型,对某65 m AHTS船侧推工况下全频段(63 Hz~8000 Hz)舱室噪声进行预报,分析该船噪声分布规律及主要影响因素。并建立起全船的SEA模型,在中频段对比SEA与FE-SEA两种方法得到的舱室声压级频谱曲线,验证了使用混合模型的必要性。

Application of FE-SEA Method in Noise Prediction of Platform Supported Vessels

The platform supported ship is usually equipped with a dynamic positioning system due to the operation requirements,and the cabin noise exceeds the standard under the thruster operating condition.In this paper,the computational fluid dynamics(CFD)method is used to calculate the pulsating pressure acted on the duct by the transverse thruster of the propeller.And the time domain calculation result is converted to the excitation condition for noise calculation.The finite element and statistical energy analysis(FE-SEA)hybrid models of the hull in medium-frequency range and high-frequency range are established respectively.The cabin noise in full-frequency range(63 Hz-8000 Hz)under the transverse thruster operating condition of a 65 m AHTS ship is predicted and the noise distribution law and main influencing factors are analyzed.The SEA model of the whole ship is established,the spectrum curves of the cabin sound pressure level obtained by SEA and FE-SEA are compared in the middle frequency band and the necessity of using this hybrid model is verified.