轴承刚度及间距对水下结构声振特性影响研究

为掌握轴承刚度及间距对水下结构振动声辐射的影响,本文建立了桨-轴-壳体简化模型,利用三维水弹性力学理论和三维水弹性声学分析软件,分析了不同轴承刚度及间距下壳体结构的声源级曲线。结果表明：轴承刚度越大,水下结构的辐射总声级越大；螺旋桨横向力激励下艉后轴承刚度对水下结构声辐射影响最大,艉前轴承次之,推力轴承影响最小；轴承间距变化对水下结构的声辐射影响不大,但容易改变推进轴系的振动状态。

Research on the Effects of Shaft Bearing Stiffness and Spacing on Vibra-acoustic Radiation of Underwater Structure

To obtain the effects of shafting bearing stiffness and spacing on vibra-acoustic radiation of underwater structure, the propeller-shaft-hull coupled structure is established, the three-dimensional sono-elastical theory and acoustic analysis software are applied to analyze the source level curve of the coupled structure under the different shafting bearing stiffness and spacing. The analysis results show that the bearing stiffness, the greater the total radiated acoustic power of underwater structures; the aft stern bearing stiffness has the biggest influence on vibra-acoustic radiation of underwater structure under vertical exciting, followed by the front stern bearing and the minimal one, the thrust bearing; the bearing spacing which is easy to change the propulsion shafting vibration state has little effect on vibra-acoustic radiation of underwater structure.