Numerical methods for ship underwater sound radiation in low frequency domain with vibro-acoustic coupling
LI Qing, YANG Deqing, YU Yang
State Key Lab of Ocean Engineering, Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, School of Naval Architecture, Ocean and Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
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.
李清,杨德庆,郁扬. 舰船低频水下辐射噪声的声固耦合数值计算方法[J]. 振动与冲击, 2018, 37(3): 174-179.
LI Qing, YANG Deqing, YU Yang. Numerical methods for ship underwater sound radiation in low frequency domain with vibro-acoustic coupling. JOURNAL OF VIBRATION AND SHOCK, 2018, 37(3): 174-179.
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