Nonlinear dynamic model of deep-water RTS

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (11) : 104-113.

HE Yufa1, GUO Xiaoqiang2, LIU Qingyou3, LIU Jun2, WANG Guorong2, MAO Liangjie3

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Abstract

In deep water test conditions, the riser-test pipe system (RTS) is subject to current VIV effect, longitudinal and transverse coupling effect and test pipe FIV effect, which is prone to buckling deformation, fatigue fracture and friction perforation. The nonlinear vibration model of deep-water RTS is established by using the differential element method, energy method and Hamilton variational principle. Based on the elastic-plastic body contact collision theory, the nonlinear contact load calculation method of the pipe string system is proposed. The cubic Hermit difference shape function and Newmark -β method are used to discretize and solve the vibration model of the system. With the help of field string parameters and similarity principle, a nonlinear vibration simulation test bench for the RTS is designed. The vibration responses of the RTS are measured. Compared with the theoretical model calculation results and the single pipe vibration model calculation results, the correctness and effectiveness of the nonlinear vibration model of the deep-water RTS are verified. On this basis, the vibration characteristics of the casing string in the South China Sea are analyzed. The results show that the influence of local high-frequency vibration cannot be ignored in the vibration fatigue analysis of the test pipe; the position where the strength failure of the testing pipe is easy to occur mainly occurs in the middle upper part and the lower part. The research results lay a theoretical foundation for the safety design of deep-water RTS.

Key words

RTS / Hamilton variational principle / Nonlinear vibration model / Simulation experiment / Vibration characteristics

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HE Yufa1, GUO Xiaoqiang2, LIU Qingyou3, LIU Jun2, WANG Guorong2, MAO Liangjie3. Nonlinear dynamic model of deep-water RTS[J]. Journal of Vibration and Shock, 2022, 41(11): 104-113

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