Dynamics response analysis of a cold-water pipe for ocean thermal energy conversion under different boundary conditions

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (12) : 59-68.

ZHANG Li1，TAN Jian2，ZHANG Yulong3，XU Jin2，HUANG Shimiao1，DUAN Qingfeng2，DUAN Menglan2

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Abstract

Large flow induces vibration and instability in pipe during conveying. To reveal the dynamic response of pipe conveying seawater, based on the Euler-Bernoulli beam model, the calculation and analysis model is established under marine condition. The semi-analytical solution of the vibration equation is solved by using Generalized Internal Transform Technique, and the time-dependent solution of structural dynamic response is given. The results show that structural damping only reduces the pipe amplitude in default of outflow. The effect of internal flow velocity on pipe amplitude is greatest under fixed-free boundary condition and least under pinned-with clump weight boundary condition. However, under the action of external flow, the internal flow velocity only influences the pipe amplitude under fixed-with clump weight boundary condition. The pipe has different natural frequency and critical velocity under different boundary conditions. With internal flow velocity increasing, the natural frequency of the pipe decreases gradually while approaching to zero.

Key words

cold water pipe / ocean thermal energy / generalized integral transformation technique / critical velocity / natural frequency / different boundary condition

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ZHANG Li1，TAN Jian2，ZHANG Yulong3，XU Jin2，HUANG Shimiao1，DUAN Qingfeng2，DUAN Menglan2. Dynamics response analysis of a cold-water pipe for ocean thermal energy conversion under different boundary conditions[J]. Journal of Vibration and Shock, 2023, 42(12): 59-68

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