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Wave decomposition of the vibrations of a cylindrical shell with an automated scanning laser vibrometer

 

作者: Hyun-Gwon Kil,   Jacek Jarzynski,   Yves H. Berthelot,  

 

期刊: The Journal of the Acoustical Society of America  (AIP Available online 1998)
卷期: Volume 104, issue 6  

页码: 3161-3168

 

ISSN:0001-4966

 

年代: 1998

 

DOI:10.1121/1.423956

 

出版商: Acoustical Society of America

 

数据来源: AIP

 

摘要:

Elastic waves propagating in a cylindrical shell have been detected by an automated scanning laser vibrometer designed to record both in-plane and out-of-plane surface motion over the surface of the shell (32 points axially and 32 points circumferentially). The structure was freely suspended in air and excited radially by a shaker at a single frequency, either below or above the ring frequency of the shell. A wave vector analysis of the data was performed with a fast Fourier transform and an overdetermined modified extended Prony method. The results clearly show the presence of longitudinal, shear, and flexural waves above the ring frequency. In addition, the Prony method reveals the presence of evanescent waves due to mode conversion of the propagating waves near the ends of the shell. Below the ring frequency, two types of in-plane waves and flexural waves were identified. The results are in excellent agreement with predictions from the dispersion curves for thin shells.

 

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