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Hybrid model testing using pre-offset and asymmetric truncation design for deepwater semi-submersible with highly compliant mooring system

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Abstract

The hybrid model testing technique has been widely used for evaluating the safety of deepwater floating systems. In this technique, a full-depth mooring system is equivalently substituted with a truncated model by employing truncation design. However, for a deepwater platform with a highly compliant mooring system, the large offset resulting from harsh environments makes it difficult to realize truncation design. The conventional symmetrically truncated mooring system starts to lose its accuracy. To achieve sufficient equivalence and enlarge the offset limit of the truncated model, a pre-offset and asymmetric truncation design is proposed in this paper for a deepwater semi-submersible system. The feasibility of the technique was first validated by numerical calculations. Thereafter, hybrid model testing was performed successfully for a semi-submersible with a highly compliant mooring system operating in harsh environments. Numerical reconstruction and extrapolation were performed, and the numerical results showed good agreement with experimental results. However, some remarkable discrepancies were observed in vertical motions because of nonlinear effects such as wave impact and the influence of bracings.

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Acknowledgements

The authors would like to acknowledge the support of the National Natural Science Foundation of China (Grant no. 51239007), the sub-project of the Important National Science and Technology Specific Projects (2016ZX05028-002-004) and the support of the China scholarship council.

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Authors and Affiliations

  1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai, China

    Handi Wei, Longfei Xiao & Xinliang Tian

  2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, China

    Handi Wei, Longfei Xiao & Xinliang Tian

  3. CNOOC Research Institute, Beijing, China

    Wei Feng

Authors
  1. Handi Wei
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  2. Longfei Xiao
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  3. Xinliang Tian
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  4. Wei Feng
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Correspondence to Longfei Xiao.

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Wei, H., Xiao, L., Tian, X. et al. Hybrid model testing using pre-offset and asymmetric truncation design for deepwater semi-submersible with highly compliant mooring system. J Mar Sci Technol 23, 536–556 (2018). https://doi.org/10.1007/s00773-017-0491-5

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  • DOI: https://doi.org/10.1007/s00773-017-0491-5

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