水下加肋双层圆柱壳体的振—声传递路径分析

简要介绍了有限元声振耦合和结构振-声传递路径分析(TPA)的基本理论。基于CAE技术建立了TPA模型,通过ANSYS声振耦合的谐响应分析,获得水下双层圆柱壳体振动响应和声场中的声压响应,利用矩阵条件数曲线优选测点位置,并结合奇异值修正的方法改善频响函数矩阵病态问题,求得振源的耦合激励力和振—声频响函数。由自编TPA程序计算得到两个振源作用下目标点的合成噪声响应与ANSYS实际计算吻合很好。利用频谱贡献云图、矢量叠加图及数据对比的方式分析了传递路径对壳外目标点噪声的贡献,从传递路径的角度找出了对壳外噪声起主导作用的环节。可见,基于CAE方法的水下双层圆柱壳体结构振-声TPA方法具有精度高、易操作、成本低等优点,对潜艇的优化设计、运行管理、针对性的维修均具有十分重要的意义。

Vibration-acoustic transfer path analysis of a submerged cylindrical double-shell

Basic theory of vibration-acoustic coupling of finite element method and structural transfer path analysis (TPA) were described and a TPA model was established based on CAE technology. Vibration re-sponse of a submerged cylindrical double-shell and pressure response in the acoustic field were acquired by the harmonic response analysis of vibration-acoustic coupling of ANSYS. With the optimal position of reference points is selected by the curve of matrix condition number and the modified singular value method was used to improve the ill-posed problem of FRF matrix, the coupled excitation force and vibra-tion-acoustic FRF were obtained. The results of target response under the action of two vibration sources are calculated by TPA program, which are in good agreement with the results computed by ANSYS. The sound contribution of each transfer path to external noise of the cylindrical double-shell is analyzed by us-ing spectral contribution nephogram and vector superposition chart. The multiple transfer paths which play a leading role in external noise are finally determined. The results indicate that the vibration-acoustic TPA method of the submerged cylindrical double-shell based on CAE technology have high efficiency, good ac-curacy, etc, which is of great significance in optimization of submarine design, operation management and targeted repair.