FPSO Spectral Fatigue Analysis

The detailed modelling and analysis was required to address the following:

• Take credit of all the hull upgrades/special survey made till date
• Identify critical structure or conditions that could fail over the remaining life
• Identify if fatigue life of the hull can be extended beyond the required year by revised and improved engineering analysis

The scope of work consist of following tasks:

• Prepared section model in FDA L2 modeller for structure iwo midship and other sections based on the longitudinal structural arrangement.
• Implemented structural scantling with major updates in the latest drydock campaign and prepared the model close to the current condition of the vessel.
• Used voyage simulation to derive fatigue damage during vessel operating as tanker.
• Generated hydrodynamic loads using Class in-built tools.
• Load set up and Conducted FDA Level 2 analysis.
• Assessed fatigue prone area of vessel for subsequent check in FDA L3 and established broad level fatigue life for longitudinal members.
• Developed global hull hydrodynamic model and conducted mean heading analysis under combined effect of wave current and wind
• Carried out hydrodynamic analysis and mapped pressure load to FEA model.
• Carried out unit load response of hull under environmental load.
• Carried out fatigue check coarse model and identified hotspots.
• Carried out voyage simulation to derive fatigue damage during tanker life.
• Fatigue check area identification of local hotspots and Class recommended locations for fine mesh FDA L3 analysis.
• Using the analysis result in Class tool, the Fatigue Critical Locations was identified which showed critical behaviour under cyclic loading.
• For each selected fatigue check area, a local fine mesh sub-model was created for fatigue damage study.
• Sub-model was analysed critically to review fatigue damage under given conditions.