推力轴承基座对艇体振动及其辐射噪声的影响(英文)

Influence of Thrust Bearing Pedestal Form on Vibration and Radiated Noise of Submarine

利用 FEM/BEM 方法计算了实尺度单壳体潜艇在螺旋桨激振力作用下的结构振动和水下声辐射特性。分析比较了两种推力轴承基座形式(法兰盘式基座和普通基座)对潜艇在螺旋桨激励下振动与噪声性能的影响。结果表明,安装法兰盘式推力轴承基座能在除 28 Hz 附近降低潜艇辐射噪声,最大降低 25 dB 左右。普通推力轴承基座形式只将螺旋桨脉动推力加载到与其相连的艇体结构上,引起纵向振动和横向振动,其壳体的法向振动较强烈;而法兰盘式推力轴承基座可以将螺旋桨脉动推力沿周向均匀地加载到艇体上,它主要引起纵向振动,只有艇体首尾处有法向振动,因而,噪声较低。

FEM/BEM method is used to calculate the structure vibration and underwater radiated noise of the single -shell submarine which is full-scale caused by the propeller fluctuating thrust force. The influence of vibration and radiated noise caused by the propeller of the two kinds thrust bearing pedestal forms （flanged thrust bearing pedestal and common pedestal） is analysed and compared. The study shows that the flanged thrust bearing pedestal can reduce the underwater radiated noise up to 25 dB in frequency region except around 28 Hz. The common pedestal is combined with the submarine hull, it causes the longitudinal vibration and the lateral vibration, and the normal vibration is much stronger; but the flanged thrust bearing pedestal transfers the propeller fluctuating force equally to the submarine hull along the circumference, it mainly causes longitudinal vibration, only the head and tail of the hull cause normal vibration, and so the noise level is lower.