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Pitch motion problem induced by dynamic positioning system for new sandglass-type floating body

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Abstract

In this paper, a new concept of sandglass-type floating body, which can overcome the performance limitations of traditional ship-type and cylindrical FDPSO (floating drilling production storage and offloading), is proposed as research subject. In the general design of dynamic positioning systems, it is adequate to deal with a three-degree of freedom problem in the horizontal plane. However, the new floating body with small water-plane area and low metacentric height may cause an unintentional coupling phenomenon between the pitch and surge motions by the thruster system. Therefore, first by numerical boundary element method (BEM) based on wave potential theory and experiments, the pitch motion characteristic of the sandglass-type model is studied and meanwhile the numerical method of this paper is validated. Furthermore, two dynamics models with and without consideration for the additional pitch moment by the thruster systems are introduced and numerically simulated, which can show the problem of pitch motion induced by the positioning thrusters. Then by the mass-spring-damper systems with two-degree of freedom, the influence of additional pitch moment by the thrusters on the pitch and surge motion performances is theoretically analyzed. Finally, based on the essential reason of pitch motion problem, a control law considering pitch inertia effect has been used and proven to be effective to decrease the pitch motion response.

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Acknowledgments

The authors are grateful to all organizations that funded the research in this paper, which was financially supported by the National Innovation Team Foundation under grant no. 50921001 (China), the National Natural Science Foundation of China (Grant No. 11202047), the Scientific Research Foundation for Introduction of Talent under grant no. DUT13RC(3)46 (China) and Natural Science Foundation of Liaoning Province under grant no. 2015020157 (China).

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Authors and Affiliations

  1. School of Naval Architecture, Dalian University of Technology, Dalian, 116024, China

    Lin-lin Wang, Wen-hua Wang, Ya-zhen Du, Hao Gao & Yi Huang

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  1. Lin-lin Wang
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  2. Wen-hua Wang
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  3. Ya-zhen Du
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  4. Hao Gao
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  5. Yi Huang
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Correspondence to Wen-hua Wang.

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Wang, Ll., Wang, Wh., Du, Yz. et al. Pitch motion problem induced by dynamic positioning system for new sandglass-type floating body. J Mar Sci Technol 22, 162–175 (2017). https://doi.org/10.1007/s00773-016-0403-0

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  • DOI: https://doi.org/10.1007/s00773-016-0403-0

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