Assessment of in-service dynamic response status of"Deep Sea No.1"energy station based on field monitoring
Floating offshore platforms are encountered with complex marine environmental conditions.Accurately grasping the in-service dynamic response status of floating platforms is crucial for ensuring the long-term safety of the platforms.Taking the semi-submersible platform"Deep Sea No.1"energy station as an example,assessment has been conducted to evaluate its environmental characteristics and the in-service dynamic response status of the platform.Based on field monitoring data of the environment,including wind,wave and current,it is found that the monitored extreme value of wind speed exceeds the design conditions within the return periods of 0 to 5 years,but it falls below the design conditions in return periods of equal to or above 5 years;The measure waves of high-frequency components vary significantly,and it is difficult for the design environmental conditions with fixed wave parameters to reflect the time-varying characteristics of waves;Inconsistent flow direction of different monitoring current layers is revealed,which is different from the traditional design conditions of uniform flow,shear flow or gradient flow.Furthermore,a complete environmental load vector for the in-service floating platform was established based on the time-frequency fitting method for wave loads.By carrying out fully coupled dynamic calculations,it is found that the platform motion amplitude of design numerical model is greater than the actual motion of the platform under the same environmental condition.This discrepancy can be attributed to variations in physical parameters of the platform resulting from factors including modifications to the upper facilities.This study has effectively assessed the service status of the semi-submersible platform and verified the safety and rationality of the design of the"Deep Sea No.1"energy station.The results can provide a basis for ensuring filed safety and operational maintenance of in-service floating platforms,while also serve as a valuable reference for future design and optimization of floating platforms.
semi-submersible platform"Deep Sea No.1"energy stationfield monitoringenvironmental assessmentdynamic response status assessment
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