基于层次诊断的水下结构振动噪声源分离量化

Separation and quantification of underwater structural vibration and noise sources based on hierarchy diagnosis

从声学的角度看,潜艇具有振动噪声源数目众多、相互之间耦合严重以及传递路径复杂的特点。层次诊断通过建立递阶层次结构对振动噪声源分离量化问题进行分解,从而形成了自上而下的支配关系,然后借助于标度通过两两比较建立判断矩阵,从而得到各振动噪声源对评价点的贡献量。根据声学中的分贝数相加原理,对层次分析法中的标度进行调整使其具有物理意义,从而使层次诊断结果是具有实际物理意义的测度。将潜艇层次诊断过程分为两个环节,分别为从艇内设备到壳体以及从壳体到水声场,并采用加权平均方法和D-S证据理论对这两个环节的计算结果进行融合。仿真计算和舱段试验验证了层次诊断应用到舱段模型振动噪声源分离量化问题中的可行性。

From acoustic point of view,a submarine has features,such as,numerous vibration and noise sources, serious coupling among them and complex transmission paths.Hierarchy diagnosis can be used to solve the problem of vibration and noise source separation and quantification by constructing a hierarchical structure,and the dominance relationship is formed from top to bottom.By means of scale,the vibration and noise source＆#39;s contribution is obtained by pairwise comparison.Here,according to the decibel addition principle,the AHP comparison scale was adjusted to have physical significance,and the results of hierarchy diagnosis become the measure with actual physical significance.The hierarchy diagnosis procedure of a submarine was divided into two links including from an equipment inside the submarine to the submarine shell and the shell to the outside underwater acoustic field.The results were fused using the weighted average method and the D-S evidence theory.The feasibility of this method was validated with simulations and cabin tests.