Analysis of Fluid-Structure Interaction Vibration Characteristics for T-Pipe in Upper Module of Offshore FPSO
The typical T-pipe in the upper module of the floating production storage and offloading is affected by the wind load and coupled with the ship in the wind and waves,so it is difficult to analyze the vibration characteristics of the pipe.In order to solve this problem,the vibration characteristics of a typical T-pipe are simulated numerically.The wind speed time history curve under the API wind spectrum is obtained by the harmonic superposition method,which is used as the inlet condition of the basin.Secondly,the motion response of the FPSO hull in wind and waves is calculated,and the acceleration is applied to the pipe in the form of the acceleration field.Based on the two-way fluid-structure coupling method,the response of the T-pipe in the wind and wave environment is calculated,and the influence of different working conditions on the vibration characteristics of the pipe is studied.The results show that the branch pipe of the T-pipe mainly vibrates mainly along the wind direction under wind load,and the displacement and stress of the pipe under API spectrum wind are much larger than those under constant wind.Under the same wind load and different hull acceleration loads,the pipe displacement changes little,and the stress is related to the wind direction.In the lee position,the pipe stress decreases compared to the condition without the acceleration load,while the other positions increase,and the pipe stress is greatly affected by the transverse and longitudinal acceleration along the hull.The presence of wind waves has a significant effect on pipe vibration,and the research results can provide references and theoretical basis for pipe layout design and strength check.
floating production storage and offloadingtypical sea wind spectrumfluid-structure interactionpipe vibration
万方数据
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