Influence analysis of tensioner system on natural frequency of top tensioned riser

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Journal of Vibration and Shock ›› 2020, Vol. 39 ›› Issue (11) : 209-216.

WU Chen1,2, YU Jianxing1,2, YU Yang1,2, CHEN Baiquan1, 2,3, XU Lixin1, 2

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Abstract

The lateral vibration equation of top tensioned riser is derived based on the Euler-Bernoulli beam model, and the natural frequency of the riser is studied by use of the Galerkin method. Considering the heave motion of platform, the natural frequency of riser calculated by the detailed tensioner model proposed in this paper is comparatively studied with that calculated by the conventional simplified model used in the engineering. At last, the impact of the tensioner structure parameters on the natural frequency of riser is studied based on the proposed model. Results show that the natural frequency of riser is influenced by the heave motion of platform. The resonance characteristics of riser may change with the heave motion of platform. The natural frequency of riser differs with different tensioner models, and the difference increases with the natural frequency order. The natural frequency of riser is impacted by the tensioner structure parameters, and the tensioner parameters should be chosen reasonably to avoid parametric resonance and vortex-induced vibration of riser.

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top tensioned riser / tensioner system / platform motion / natural frequency

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WU Chen1,2, YU Jianxing1,2, YU Yang1,2, CHEN Baiquan1, 2,3, XU Lixin1, 2. Influence analysis of tensioner system on natural frequency of top tensioned riser[J]. Journal of Vibration and Shock, 2020, 39(11): 209-216

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