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

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (20) : 12-16.

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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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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.

Key words

Transfer path analysis(TPA) / vibration-acoustic / sound contribution / cylindrical double-shell

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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