Abstract
A launch and recovery system for a seafloor drill was studied using a dynamic model that considered the influences of seawater resistance and the elastic deformation of the cable based on the lumped mass method. The influence of wave direction angle on heave, roll, and pitch motions of the ship was analyzed, and those motion characteristics were then used to assess the tension response of the armored umbilical cable at the lifting point under different wave direction angles. By analyzing the different wave direction angles we found that, when a ship experiences longitudinal waves it will express longitudinal movement. When a ship encounters transverse waves, it will have transverse movement. Under oblique waves from bow or stern, a ship will have both longitudinal and transverse movement, exhibiting obvious heave and pitch movements. Oblique waves, in this study, produced the most obvious impact on armored umbilical cable tension. However, the tension of the armored umbilical cable will change based on the weight of the armored umbilical cable and the seafloor drill in the water. This analysis has provided a useful reference for the study of heave compensation and the constant tension automatic control.
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This project was financially supported by the National Natural Science Foundation of China (Grant Nos. 51705145 and 51779092), and the special funding support for the construction of innovative provinces in Hunan Province (Grant Nos. 2020GK1021, 2019SK2271, and 2019GK1012).
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Jin, Yp., Xie, K., Liu, Gp. et al. Influence of Wave Direction on the Dynamic Response of A Submarine Equipment Launch and Recovery System. China Ocean Eng 36, 144–154 (2022). https://doi.org/10.1007/s13344-022-0013-z
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DOI: https://doi.org/10.1007/s13344-022-0013-z