Dynamic analysis of floating wind turbines subjected to deterministic wind gusts

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.advisorBachynski, Erin
dc.contributor.advisorCollette, Matthew
dc.contributor.authorWang, Xuwen
dc.contributor.schoolInsinööritieteiden korkeakoulufi
dc.contributor.supervisorRomanoff, Jani
dc.date.accessioned2019-08-25T15:01:22Z
dc.date.available2019-08-25T15:01:22Z
dc.date.issued2019-08-19
dc.description.abstractA wind turbine converts kinematic energy to electrical energy, and can be designed from onshore to offshore operation, then from shallow water to deep water. Compared to onshore wind turbines, floating wind turbines face more complicated environment conditions. To guarantee stability of floating wind turbines in various environment conditions, extreme wind and wave loads should be studied. This thesis focuses on the dynamic response in time domain under extreme deterministic wind gusts, in a return period of 50 years, for which simulations are carried out in order to assess the turbine’s performance and build a database: softwares SIMA, FAST and Matlab are used for the task. Based on equations of motion of platform, a simplified dynamic wind turbine model inspired by the DTU 10-MW RWT is built in Matlab to study extreme response subjected to deterministic gusts defined in DNV-OSJ103: Design of Floating Wind Turbine Structures. The simple model includes generator torque and a blade pitch control system converted from the NREL 5-MW turbine source code in FAST, written in Fortran. Extreme loads on the mooring system can be assessed by surge and pitch offsets of the platform in the output. Contrasting results from SIMA and Matlab and analyzing different gust shapes, the extreme (worst) deterministic gust are found.en
dc.format.extent76+41
dc.format.mimetypeapplication/pdfen
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/39813
dc.identifier.urnURN:NBN:fi:aalto-201908254874
dc.language.isoenen
dc.programmeNordic Master Programme in Maritime Engineeringfi
dc.programme.majorMaritime Engineeringfi
dc.programme.mcodefi
dc.subject.keywordwind turbineen
dc.subject.keyworddynamic responseen
dc.subject.keyworddeterministic gusten
dc.subject.keywordMatlaben
dc.subject.keywordSIMAen
dc.subject.keywordFASTen
dc.titleDynamic analysis of floating wind turbines subjected to deterministic wind gustsen
dc.typeG2 Pro gradu, diplomityöfi
dc.type.ontasotMaster's thesisen
dc.type.ontasotDiplomityöfi
local.aalto.electroniconlyyes
local.aalto.openaccessyes

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