Abstract:

It is effective to reduce vibration of a ship stern that vibration isolation on the dominant transmission path. The transmission paths model of a ship stern was built based on the ship stern structure. When excited longitudinally at the propeller, the transmission paths of stern is analyzed and sequenced by the transmission paths analysis method. The results show that the palace at bearing basement is a dominant path when excited longitudinally. Thus, when the dominant transmission path is identified, passive control or structural modifications on the path can attenuate vibration levels effectively. The numerical results explain that the acoustic radiations of the structure can reduced by modification of the bearings rigidities and of bearing basement configuration.

Key words: vibration and wave, acoustic radiation, stern, transmission path

摘要：

采用有限元/边界元方法对艉部的声振特性进行研究。首先建立了包含主推进系统在内的有限元模型，分析流固耦合下结构的振动，并利用边界元技术进行结构水下声辐射预报。然后根据传递路径分析方法，对纵向激励下艉部的传递路径进行分析排序。结果显示，纵向激励下，推力轴承基座是艉部振动的主要传递路径。在确定了潜艇艉部的主要振动传递路径后，在主要传递路径上采取隔振措施，以达到减振降噪的目的。研究表明，改变推力轴承的刚度和基座结构形式，对艉部的减振降噪有一定作用。

关键词: 振动与波, 声辐射, 艉部, 传递路径