后艉轴承刚度对潜艇结构振动与声辐射的影响

Influence of stiffness constant of stern bearing on vibration and acoustic radiation of whole submarine

    摘要
  • 摘要:
      目的  为了研究后艉轴承刚度对潜艇结构振动与声辐射的影响，
      方法  针对螺旋桨不定常激振力诱发的艇体结构辐射声，以SUBOFF潜艇为原型，建立了包含螺旋桨和轴系实体结构单元的潜艇整艇模型，采用通用有限元程序NASTRAN计算其在真空中的振动特性，同时采用附加质量附加阻尼算法计算其在水下的振动和声辐射特性，对潜艇整艇结构在螺旋桨垂向激振力作用下的振动与声辐射特性进行分析，并着重考虑了后艉轴承刚度对潜艇整艇结构振动与声辐射的影响规律。
      结果  研究指出，降低后艉轴承刚度使潜艇结构振动与声辐射的能力主要向其第2阶整体弯曲振动模态频率处集中，且第2阶整体弯曲振动模态频率逐渐向低频移动；在第2阶整体弯曲振动模态频率以上频段降低后艉轴承的刚度能够有效降低潜艇整艇结构的振动和声辐射。
      结论  所得结果可为声学设计阶段潜艇关键部位结构参数的选取提供参考。

     

    Abstract:
      Objectives  This paper studies the influence of the stiffness constant of a stern bearing on the vibration and acoustic radiation of a whole submarine.
      Methods  Based on the form of SUBOFF, a whole submarine model is established in which the structures of the propeller and shaft are first formed in solid elements. Through calculating and comparing the structural vibration and acoustic radiation driven by a vertically excited force, the influence of the elastic coefficient of the stern bearing on the vibroacoustic of the overall submarine structure is mainly considered.
      Results  It is demonstrated that the reduction of the elastic coefficient of the stern bearing leads to the convergence of structural vibration and acoustic radiation to the second order overall bending modal frequency, and the frequency gradually becomes lower, which can benefit the vibroacoustic reduction of submarines at frequencies higher than the second order overall bending modal frequency.
      Conclusions  These results provide a reference for the acoustic design of submarine structures.

     

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