Research on survivability test method for new types of floating offshore platforms under extreme sea conditions
The safety of offshore platforms is receiving increasing attention,and their safety relies to a great extent on safety design standards and regulations.Currently,there are limited standards available specifically for survivability testing methods of new types of floating offshore platforms under extreme sea conditions.Referring to the IEC TS 62600-103 issued by the International Electrotechnical Commission(IEC)for survivability testing of wave energy converters under extreme sea conditions,improvements have been made in terms of operability and selection of environmental conditions.A survivability testing method for new types of floating offshore platforms is proposed:selecting the 100-year return wave conditions as the reference condition and determining two sets of contrasting sea conditions with different wave directions,spectra,and energy levels,centered around the reference wave condition.This results in a total of nine independent environmental conditions used to test the platform's maximum response under a specific wave condition.After determining the wave condition,three additional tests are conducted with 100-year return wind and current conditions:wind and waves co-directional but not concurrent with the current;wind and waves co-directional and concurrent with the current;wind,waves,and current all non-co-directional.Taking the"National Sea Trial I"offshore test platform deployed at the Weihai site of the National Marine Comprehensive Test Site as an example,numerical simulation methods are used to study its survivability under extreme sea conditions.The feasibility of the proposed survivability testing method is verified through the research process,and the suggested testing method can serve as a reference for future standard development.
new types of offshore platformsextreme sea conditionssurvivabilitytest method
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