Dynamic behavior analysis for a two-end simply-supported slender cylinder subjected to pulsating flow

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (13) : 49-56.

SHU Yafeng1,2, WU Jianjun1, YANG Yongwei2, LI Jiajun1

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Abstract

The nonlinear dynamic model of a two-end simply-supported cylinder subjected to axial pulsating flow was established considering a nonlinear term caused by additional axial force. In order to study dynamic characteristics of the system, effects of key parameter’s pulsating frequency on dynamic behaviors of the system were further discussed. From bifurcation diagram, it was observed that chaos may exist in the system within a certain frequency range. Phase diagrams, Poincare mapping and statistical features, such as, power spectrum and the maximum Lyapunov exponent under 3 special pulsating frequencies were used to analyze dynamic characteristics of the system. It was shown that the results provide a guide for safety assessment of flow induced vibration of a fuel rod caused by pulsating flow in a reactor system.

Key words

nonlinear term / pulsating flow / bifurcation diagram / dynamic characteristics

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SHU Yafeng1,2, WU Jianjun1, YANG Yongwei2, LI Jiajun1. Dynamic behavior analysis for a two-end simply-supported slender cylinder subjected to pulsating flow[J]. Journal of Vibration and Shock, 2020, 39(13): 49-56

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