带浮筏装置的船舶结构水下声辐射计算及分析

针对带浮筏隔振装置的机舱段,从声辐射的指向性、声辐射功率以及场点辐射声压、声强的角度出发,采用有限元和边界元相结合的方法,计算分析了船舶结构在水中航行时,由船舶辅机的振动引起的船舶壳体的辐射噪声特性,并考虑流体与船舶结构的流固耦合问题,计算结果表明,船舶结构的振动辐射噪声有着很强的指向性,频率越高,指向性越强,辐射声压随着传播距离的增加而迅速下降,下降的梯度与激振频率、场点的远近有关.

Calculation and Analysis of Acoustic Radiation of Submarine Structure With Floationg Raft Arrangement

Based on the submarine structure with floating raft arrangement, the acoustic radiation behavior of the submarine was studied with a combination method of FEM and BEM. The noises originated from the vibration of marine auxiliary machinery. Radiated acoustic direction, radiated acoustic power, radiated acoustic pressure and acoustic intensity are calculated. Here the fluid - structural coupling between seawater and submairne was concerned. The result showed that the acoustic radiation behavior of the submarine had a strong direction, the higher frequency, the stronger in direction; and that the radiated acoustic pressure promptly droped with the spread distance, while the droping gradient depends on the frequecy of inspirator and the distance of field point.