| METALS AND METAL MATRIX COMPOSITES |
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| Underwater Vibro-acoustic Behavior of Composite Cylindrical Shell with Sandwich Structure: an Experimental Study |
| TONG Bo, LI Yongqing, ZHU Xi, ZHANG Yanbing
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| Department of Naval Architecture Engineering, Naval University of Engineering, Wuhan 430033 |
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Abstract Aiming at evaluating the vibro-acoustic behavior of composite cylindrical shell with sandwich structure, a sandwich shell model with sound-absorbing core was designed, as well as a steel shell with equal weight for comparison. And the underwater vibration and sound radiation experiments were carried out. The experimental results revealed that the tested values of the first seven natural frequencies of both composite sandwich shell and steel shell were in good agreement with the simulated results based on finite element simulation, which verified the reliability of experiment results. The frequency response test curves of both steel shell and composite sandwich shell were consistent with the numerical simulation results in low frequency range, and the agreement in tested and simulated curves of steel shell was superior to that of composite sandwich shell. In terms of the vibration reduction effect of composite sandwich shell, there were the average reduction capacity of 18.3 dB and 18.9 dB by experimental test and numerical calculation, respectively, which showed the favorable damping performance of the sound-absorbing core. Concerning the sound absorption effect of sound absorption shell in low frequency range, there was a maximum decreasing amplitude of 5.05 dB in sound pressure level (SPL) at 8 directional angles, with an average decreasing amplitude of 2.28 dB, which indicated the effectiveness of this composite sandwich shell in reducing low frequency line-spectrum noise.
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Published: 16 May 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (50979110). |
| About author:: Bo Tong received his Ph.D. degree in December 2018 from Navy University of Engineering in engineering. His research interests are marine composite materials and their applications.Yongqing Li received his Ph.D. degree in engineering from Navy University of Engineering in 2012. He is currently an associate professor in Navy University of Engineering and participates in the marine composites and their engineering applications. |
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2019, Vol. 33 
