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Application of Bisection Method and Controller Gains Database Method in Dynamic Station-Keeping Capability Analysis

[+] Author Affiliations
Shengwen Xu, Xuefeng Wang, Lei Wang

Shanghai Jiao Tong University, Shanghai, China

Bo Li

Florida Atlantic University, Boca Raton, FL

Paper No. OMAE2015-41120, pp. V001T01A057; 9 pages
doi:10.1115/OMAE2015-41120
From:
  • ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering
  • Volume 1: Offshore Technology; Offshore Geotechnics
  • St. John’s, Newfoundland, Canada, May 31–June 5, 2015
  • Conference Sponsors: Ocean, Offshore and Arctic Engineering Division
  • ISBN: 978-0-7918-5647-5
  • Copyright © 2015 by ASME

abstract

Dynamic positioning capability (DPCap) analysis is a traditional method to verify a DP vessel’s ability to resist the environmental conditions for given headings. However, DPCap analysis is inherently quasi-static, the environmental forces are statically balanced by the thrust forces provided by the thrust system. Dynamic station-keeping capability (DynCap) analysis can provide a more detailed study of a vessel’s station keeping capability in realistic dynamic conditions. DynCap analysis is based on a DP simulator, which is absolutely dynamic and relatively realistic. However, since the numerical simulation based on the simulator is more time-consuming compared to the static analysis, the selection of the environmental condition sequence becomes critically important to the efficiency of the DynCap analysis. This paper proposes application of the bisection method to achieve the environmental condition limit and a controller gain database method to tune the control parameters in the DP simulator. The efficiency of the DynCap analysis is expected to be improved. Numerical analyses for a semi-submersible were conducted to investigate the performance of a program developed based on the present study. The feasibility of the program and the effectiveness and efficiency of the methods were both demonstrated.

Copyright © 2015 by ASME

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