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Fatigue damage of

mechanical componentin land based and

oshore wind turbines

SHARATH.B.N

M.Tech. 2nd Semester

BMS College of Engineering

TECHNICAL SEINA!



Wind Turbines

Lnd bsed

!"#shore bsed



"ase designs for #oating witurbines



Abstrct

• Com$rison of ftigue dmge of gers nd berings bet%een

• &lobl nl'sis is crried out using ero#h'dro#ser(o#elstic co

• Lods re $$lied to the gerbo) modelled using Multi Bod' S*MBS+.

• ,tigue dmge is clculted bsed on SN#cur(e nd -lmgreh'$othesis under identicl %ind conditions.

• Results re com$red.



. &lobl nl'sis

using ero#h'dro#ser(o#elstic code*S/M!#R/,LE0#Aero1'n+.

2. ,

nd$$bo)

3. Multi Bod'Simultion model

4. ,nout



Land based and spar wind turbinemodels $N!EL%

• Modelled using S/M!#R/,LE0#Aero1'n.

• S/M! 5 models the rigid bod' h'drod'nmics od the hull nbod' com$onents of the turbine.

• R/,LE0 5 ,inite element sol(er.

• Aero1'n 5 ,orces nd moments on bldes bsed on BldeElement6Momentum *BEM+ or &enerli7ed 1'nmic W8e *theories.

•

The s$r %s modelled s rigid bod'.



&eneral characteristics



' ( gearbo) model $N*(ITEC

• Consists of three stges 5 2 $lnetr' nd $r

helicl gers.



"S model



Fatigue damage in gears

• &er tooth bending ftigue dmge b' -lmgren#M

h'$othesis

Nt is the number of stress c'cles in one hour

9c nd m re SN cur(e $rmeters

c re the Weibull sh$e nd scle $rmeters of stress rnge



• The stress rnge is obtined b' Lod 1urtion

1istribution *L11+ method.

• Stress rnge is function of both e)ternl lod:uctutions nd ger rottionl s$eed.

• Stress c'cle counting method for gers is di"eretht of other structurl com$onents.



Fatigue damage in bearings

• Bering life nd dmge clcultion is bsed onLundberg#-lmgren e;ution

• - is the d'nmic e;ui(lent rdil lod gi(en b'• L is the bering life de<ned s the number of

c'cles tht =>? of the berings chie(e under certin test conditions

• is 3 for bll bering nd 3.33 for roller berings• C is the bsic lod rting nd constnt for gi(en

bering• 1mge is obtinedb'

li is the number of lod c'cles in hourssocited %ith lod rnge -i



!esults



!esults• the com$rison fctor for ftigue dmge bet%een the t%o

turbines



E;ui(lent B is



Conclusions from the stud+

•

/t is found tht the min bering crr'ing )il losustins higher dmge in s$r thn the lnd#bturbine.

• !ther gers nd berings encounter lo%er or e;

dmges in s$r turbine %hen com$red %ith thbsed.

• The bering life is une;ul for u$%ind nd do%n$lnet berings in s$r %ind turbine similr to th

bsed turbine.



Technical paper

Amir Rse8hi Ne@d Erin E. Bch'ns8ib hen &o Torgeir Mon.

,tigue 1mge Com$rison of Mechnicl Com$in Lnd#

Bsed nd S$r ,loting Wind Turbine -rocedi

Engineering > 2>



THAN9 !D

Download - Tech Seminar on Wind turbines

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