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Experimental study on a semi-submersible platform DP system based on thruster biasing
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Li-gang TANG1, 2, Lei WANG1, 2, Hua-cheng HE1, Yi-ting WANG1
Journal of Ship Mechanics | 2024, 28(10) : 1526 - 1540
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Journal of Ship Mechanics | 2024, 28(10): 1526-1540
• Hydrodynamics •
Experimental study on a semi-submersible platform DP system based on thruster biasing
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Li-gang TANG1, 2, Lei WANG1, 2, Hua-cheng HE1, Yi-ting WANG1
Affiliations
  • 1.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
  • 2.SJTU-Sanya Yazhou Bay Institute of Deepsea Science and Technology, Sanya 572000, China
Published: 2024-10-20 doi: 10.3969/j.issn.1007-7294.2024.10.007
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For semi-submersible platforms equipped with dynamic positioning (DP) system, which has a small water-plane area and low metacentric height, vertical motion (roll, pitch, heave) will be affected by the normal control force of the thrusters. In light of this, this paper proposes a novel thrust allocation method based on thruster biasing, which aims to suppress the vertical motion and ensure the positioning accuracy of the horizontal motion. Model scale tests are conducted for the dynamic positioning of a semi-submersible platform in the ocean wave basin, to analyze and compare the six-degree-of-freedom motion responses under different environmental loads and thruster biasing configurations. The results show that the thruster biasing strategy can ensure the ability of station-keeping and significantly reduce the response amplitude near the natural frequency of the vertical motion of the platform, the reduction of the power spectrum peak is up to 54.7% under the given test cases, while the vertical motion in the wave-frequency is unaffected. The research results give a novel idea for the control of semi-submersible platform vertical motion.

thruster biasing  /  dynamic positioning  /  semi-submersible platform  /  model test  /  vertical motion
Li-gang TANG, Lei WANG, Hua-cheng HE, Yi-ting WANG. Experimental study on a semi-submersible platform DP system based on thruster biasing[J]. Journal of Ship Mechanics, 2024 , 28 (10) : 1526 -1540 . DOI: 10.3969/j.issn.1007-7294.2024.10.007
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Article Info
doi: 10.3969/j.issn.1007-7294.2024.10.007
  • Receive Date：2024-04-25
  • Online Date：2026-03-26
  • Published：2024-10-20
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  • Received：2024-04-25
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Affiliations
    1.State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
    2.SJTU-Sanya Yazhou Bay Institute of Deepsea Science and Technology, Sanya 572000, China
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