推力轴承基座结构形式对潜艇振动噪声的影响

Influence of thrust bearing seating on acoustic radiation of submarine

    摘要
  • 摘要:
      目的  为研究推力轴承基座结构形式对潜艇辐射噪声的影响，
      方法  采用有限元法和有限元耦合流体边界元法，分析不同纵向激振力分布形式下耐压艇体结构的振动响应特征，得出力对称分布有利于减小振动的结论。然后，据此设计对称式推力轴承基座，通过选择不同的构件尺寸控制系统的纵向刚度，分别计算采用对称式和传统推力轴承基座时潜艇的结构振动响应和辐射噪声。
      结果  研究表明，在螺旋桨纵向激振力一定的情况下，采用对称式推力轴承基座能够明显降低艇体结构的振动强度和辐射噪声。
      结论  所做研究可为潜艇推力轴承基座结构的声学优化设计提供参考。

     

    Abstract:
      Objectives  In this paper, the influence of thrust bearing seating on the acoustic radiation of a submarine is studied.
      Methods  By utilizing the Finite Element(FE)method and FE coupling fluid interface method, the structure vibration of the pressure hull is calculated with different distributions of longitudinal exciting forces. In this case, the symmetrical distribution of exciting forces and moments are beneficial for reducing vibration. According to the above conclusions, symmetrical thrust bearing seating is designed and the longitudinal stiffness of the system controlled through choosing the size of components. Two submarines are designed, one with conventional thrust bearing seating and the other one with symmetrical thrust bearing seating. The vibration response and radiation noise of the structures of the two submarines are forecasted.
      Results  It can been seen that when the propeller longitudinal force is constant, symmetrical thrust bearing seating can significantly decrease the level of vibration and radiation noise.
      Conclusions  The results can provide references for the acoustic optimization and design of the thrust bearing seating of submarines.

     

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