双层圆柱壳体水下振动噪声结构传递路径分析

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振动与冲击 ›› 2012, Vol. 31 ›› Issue (20) : 12-16.

论文

双层圆柱壳体水下振动噪声结构传递路径分析

张磊1 曹跃云1 何元安2 杨自春1

作者信息 +

Structural transfer path analysis of submerged cylindrical double-shell vibration and noise

ZHANG Lei1, CAO yue-yun1, He yuan-an2 , YANG Zi-chun1

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文章历史 +

摘要

为了实现水下双层圆柱壳体噪声源及传递路径的识别、量化，建立了水下结构振-声传递路径分析（TPA）模型，模型借助互谱技术、平均技术及加窗来进行频响函数估计，并结合正则化方法改善频响函数矩阵求逆的病态问题。进行了双层圆柱壳体水下振动-声辐射试验，实现噪声与结构振动数据的同时基采集。编制TPA程序计算得到合成噪声响应与实测结果吻合很好，利用频谱贡献云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，结果与分布运转法所得一致，进而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，建立的水下双层圆柱壳体结构振-声TPA方法可以有效地识别、量化主要噪声源和噪声的传递路径，并且能够指导水下噪声实时预报和采取针对性的减振降噪措施。

Abstract

To identify and quantify noise source and transmission path of submerged cylindrical double-shell, a (Transfer Path Analysis) TPA model of submerged structure is established which take into account window functions and the technique of cross-spectral and average in estimating frequency response function, and which use regularization method to improve the ill-posed problem of frequency response function in seeking exciting force. The test of vibration and acoustic radiation of submerged cylindrical double-shell is implemented, the data of noise and structural vibration collect simultaneously. The results of synthetic noise response which calculate by TPA program consistent well with the experimental results. The sound contribution of each transfer path to external noise of the cylindrical double-shell is analyzed by using spectral contribution nephogram and the method of data compare, the result are identical with the result of distribution operation. 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 can identify and quantify noise source and transmission path, which is of great significance in guiding a real-time prediction of radiation noise and adopting appropriate measure to reduce structural vibration and radiated noise.

导出引用

张磊曹跃云何元安杨自春 . 双层圆柱壳体水下振动噪声结构传递路径分析[J]. 振动与冲击, 2012, 31(20): 12-16

ZHANG Lei;CAO yue-yun;He yuan-an;YANG Zi-chun. Structural transfer path analysis of submerged cylindrical double-shell vibration and noise[J]. Journal of Vibration and Shock, 2012, 31(20): 12-16