Analysis and design of floating production storage and offloading unit against extreme ice actions

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Amdahl, Jørgen
dc.contributor.advisor Kujala, Pentii He, Zhengmin 2014-10-21T07:37:42Z 2014-10-21T07:37:42Z 2014-08-25
dc.description.abstract To explore the Arctic regions, ice conditions are taken into account. Ice-structure interactions are analyzed for ice region FPSO FPU-ICE of SEVAN Marine, especially for extreme level ice events (ELIE) and accidental level ice events (ALIE). With respects to ISO/CD 19906 standard, ice conditions including physical properties and mechanical properties are reviewed respectively. Different principles behind DNV, IACS, NORSOK and ISO ice region design codes are discussed, with emphasis on ISO/CD 19906. Local and global ice actions from Barents Sea are researched according to ISO 19906. The conical part of the FPSO is simplified as a stiffened plate with deck and stringer. Simple plastic analysis of FPU-ICE substructure is compared with the nonlinear simulation carried out by ABAQUS. Six models chosen from design preference with regards to optimization by weight have been applied in ABAQUS nonlinear finite element analysis. It is performed to investigate the plastic bending capacity and energy dissipated in plastic strain. Arctic region structure design check ELIE and ALIE are carried out respectively. The nonlinearity of structure under ice loading is presented based on the principles of nonlinear finite element analysis. Sensitivity of mesh size in NLFEA is investigated by convergence test. The target to find ultimate strength capacity of the substructures by critical strain level is integrated in ABAQUS in terms of arch length method with both small (ELIE) and large deformations (ALIE). General guidelines for ELIE design events are introduced on the basis of investigation experience. en
dc.format.extent 76+30
dc.language.iso en en
dc.title Analysis and design of floating production storage and offloading unit against extreme ice actions en
dc.type G2 Pro gradu, diplomityö en Insinööritieteiden korkeakoulu fi
dc.subject.keyword FPSO en
dc.subject.keyword nonlinear finite element analysis en
dc.subject.keyword plastic bending en
dc.subject.keyword strength design en
dc.subject.keyword extreme ice action en
dc.identifier.urn URN:NBN:fi:aalto-201410212820
dc.programme.major Nordic Master in Maritime Engineering fi
dc.programme.mcode ENG3034 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Amdahl, Jørgen
dc.programme Master’s Programme in Mechanical Engineering fi

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