Abstract
In this study, the dynamics of the tendon/top tension riser (TTR) system of a tension-leg platform (TLP) are investigated through an experiment and by using absolute nodal coordinate formulation (ANCF). First, the model test of the TLP system is conducted in the water tank of Harbin Engineering University to examine the motion response of the TLP and the dynamic response characteristics of the tendon and TTR. The test scale ratio is set to 1: 66.3. Then, on the basis of the ANCF, the stiffness, external load, and mass matrices of the element are deduced to establish the motion equation of the tendon/riser. Finally, the static and dynamic characteristics of the tendon/TTR system of TLP are analyzed systematically by using the ANCF method. The results are compared with commercial software and test results. The motion response of tendon/TTR is affected by the TLP movement and environmental load simultaneously. The analysis proves the effectiveness and accuracy of the ANCF method despite the low number of riser units, suggesting the superiority of the ANCF method for calculating the dynamics of tendon/riser in the field of ocean engineering.
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Article Highlights
• On the basis of the ANCF, the motion equation of the tendon/riser is established. The static and dynamic characteristics of the tendon/TTR system of a TLP are analyzed systematically. A comparison of the results of ANCF with those of SESAM and the experiment shows that the tension at the top node of tendons/TTRs in the numerical simulation is in good agreement. This finding indicates that the ANCF method in this study is reasonable and accurate for calculating multibody structure despite a lower element number;
• The hydrodynamic calculation method of the TLP is introduced. With the combination of the flexible structure model of ANCF with the TLP motion model, a rigid-flexible coupled multibody model is formed, which can accurately simulate the coupled dynamic response of the TLP, the tendons, and the risers under different sea conditions.
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Kang, Z., Hung, L.Q., Li, S. et al. Numerical and Experimental Study on the Dynamics of the Tendon/Top Tension Riser System of a Tension-Leg Platform. J. Marine. Sci. Appl. 21, 177–191 (2022). https://doi.org/10.1007/s11804-022-00309-3
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DOI: https://doi.org/10.1007/s11804-022-00309-3