Several procedures have been proposed and developed to overcome the challenge in ultradeepwaters testing. A realistic alternative approach uses a hybrid passive methodology through equivalent truncated mooring systems. Often, the searching for equivalent systems involves using a trial-and-error. As an alternative, researches on the use of optimization techniques to establish truncated mooring system with the required properties have been attempted in recent years. In the literature, it is available only approaches considering nongradient-based algorithms. These algorithms usually involve several parameters which require appropriate tuning to provide good performance. Our approach involves optimization algorithms based on gradient. We use a calibration method to perform a static adjustment of design variables to optimally fit truncated mooring system to full-depth mooring system, which proved efficient. A further feature of this work is related to the study of the influence of design variables on the response, through a methodology based on design of experiments (DOE), avoiding the use of irrelevant variables. It should be emphasized that to the authors' knowledge this DOE methodology presented was not seen in other works in this field. We will show that the methodology proposed in this work makes easy to find an equivalent mooring system on truncated water depth. We will present and discuss two fictitious cases, one case based on the literature and another case based on a real scenario. The results show a good agreement between truncated mooring system and full-depth mooring system for the static adjustment.
Using Design of Experiments and Design Optimization to Determine Statically Equivalent Mooring System on Truncated Water Depth
Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received April 18, 2016; final manuscript received March 16, 2017; published online May 16, 2017. Assoc. Editor: Muk Chen Ong.
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Ferreira, F. M. G., Lages, E. N., Afonso, S. M. B., and Lyra, P. R. M. (May 16, 2017). "Using Design of Experiments and Design Optimization to Determine Statically Equivalent Mooring System on Truncated Water Depth." ASME. J. Offshore Mech. Arct. Eng. August 2017; 139(4): 041302. https://doi.org/10.1115/1.4036376
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