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Research Topic:Optimisation of

O shore Wind TurbineSupporting Structures

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Presentation Outline

1.Concept of Wind Turbine andRelevance.Research !otivation

".#im of Research$.Ob%ectives&.Present Wor's So far

(.)uture Wor' Plans*.+no,ledge -mpact

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Concept of Wind Turbine andRelevance

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-ndustrial emand/Challenge

Relating demands perspective to structuralintegrit0

• eeper depth ,hich re2uires more steel3 thus

construction becomes heavier. Slenderness ofthe structure in regards to structural responsebecomes a critical design issue

• 4igher demand for energ0 re2uires biggerturbines3 thereb0 more structural load on the,ind turbine supporting structures

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Research !otivation 5imitations on Codes andStandards

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Research !otivation 5imitations on Codes andStandards

• 6urocode limitations Similar to C- 6CT• 7ield strength 8 $(9 /mm 3• ominal tube thic'ness .&mm 8 t 8 &mm• ;racing inclination angle

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Research #im

• To derive equations that can predict accurately the stress-fatigue relationship of tubular steel joints of o shore windturbine supporting structures for structural optimisation.

Tas's to #chieve #im :

• =uantif0ing and de>ning and the structural load ?o, of the super@structure to the sub@structure. # t0pical eAisting o shore ,indturbine ,ould be modelled

• -dentif0ing the limitations on the di erent t0pical tubular steel %ointsof di erent codes and Standards.

• Carr0out numerical Simulation on these t0pical tubular steel %ointsand validate ,ith eAisting models

• Carr0out anal0sis on upper limits of geometric and steel strengthof present codes and standards of 6urocode and C- 6CT.

• Balidate result ,ith other Stress@)atigue resistance of ,eldedtubular %oints

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Present Wor's• Quantifying Wind Load

,ind turbine soft,are is use to determine the thrust and moments on the bladind turbine.

)orce on blade against incident ,ind

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Present Wor's• Quantifying Wind Load

,ind turbine soft,are is use to determine the thrust and moments on the bladind turbine.

)orce on blade against TSR

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Present Wor's• Quantifying tresses on !valuation on T-"oint

ell and Solid elements ,ere used to create a T@%oint to eAamine the results obt

Shell elements

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Present Wor's• Quantifying tresses on !valuation on T-"oint

ell and Solid elements ,ere used to create a T@%oint to eAamine the results obt

Solid elements

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References

• #illingham "$ %ealy "$ and purrier "$ Current andpotential use of high strength steels in o shorestructuresD3 !T Publication E&/19 F1EE&G3 -S; 1@

H*9@&""@ $@1• &odgers ' "$ and Loc(head " )$ The ,elding of grade

$&9 o shore structural steelsD3 Proc Conf. on Weldingand Weld Properties in the O shore -ndustr035ondon3 #pril 1EE

• Webster !$ Structural materials for o shorestructures I past3 present and futureD3 Proc.Conf. onSafe esign and )abrication of O shore Structures3-;C3 5ondon3 Sept. 1EE"

•

%ealy "$ and #illingham "$ 4igh strength steels I aviable option for o shore designsD3 6uroforum