Free vibration of orthotropic cylindrical shells under water pressure load

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Journal of Vibration and Shock ›› 2024, Vol. 43 ›› Issue (17) : 34-40.

SHAO Haofeng1,2, JIN Yang1,2, LIN Zhuang1,2, YANG Lihong1,2, WU Linzhi1,2

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Abstract

Composite cylindrical shells are lightweight and have good mechanical properties. It has a promising application in pressure-resistant shell structures for underwater unmanned vehicles (UUVs). The question of how to accurately predict the vibro-acoustic performance is a key concern for the acoustic-stealth design of UUVs. In this work, a theoretical model is developed based on the Flügge theory and the wave propagation method to investigate the free vibration of orthotropic cylindrical shells under hydrostatic pressure. The eigenfrequencies of the submarine orthotropic anisotropic cylindrical shells are solved by using Newton's iterative method, and the correctness of the submarine orthotropic anisotropic model is verified by comparing with the finite element simulation. The results show that the eigenfrequency of the submarine orthotropic anisotropic cylindrical shell is reduced by the combined effect of fluid-structure coupling and hydrostatic pressure. Moreover, a parameter analysis is carried out and the influence of the length-to-diameter ratio, the thickness-to-diameter ratio, and the material parameters is studied theoretically and numerically. The results of this work not only provide a theoretical basis and data reference for the analysis of vibro-acoustic characteristics of composite pressure-resistant shell, but also are of great significance for the acoustic-stealth design of UUVs.

Key words

Orthotropic anisotropic cylindrical shells / Underwater free vibration / Wave propagation method / Fluid-structure coupling / UUV pressure-resistant shells

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SHAO Haofeng1, 2, JIN Yang1, 2, LIN Zhuang1, 2, YANG Lihong1, 2, WU Linzhi1, 2. Free vibration of orthotropic cylindrical shells under water pressure load[J]. Journal of Vibration and Shock, 2024, 43(17): 34-40

References

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