tech seminar on wind turbines
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7/21/2019 Tech Seminar on Wind turbines
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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!
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Wind Turbines
Lnd bsed
!"#shore bsed
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"ase designs for #oating witurbines
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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 $$lied to the gerbo) modelled using Multi Bod' S*MBS+.
• ,tigue dmge is clculted bsed on SN#cur(e nd -lmgreh'$othesis under identicl %ind conditions.
• Results re com$red.
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. &lobl nl'sis
using ero#h'dro#ser(o#elstic code*S/M!#R/,LE0#Aero1'n+.
2. ,
nd$$bo)
3. Multi Bod'Simultion model
4. ,nout
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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'.
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&eneral characteristics
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' ( gearbo) model $N*(ITEC
• Consists of three stges 5 2 $lnetr' nd $r
helicl gers.
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"S model
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Fatigue damage in gears
• &er tooth bending ftigue dmge b' -lmgren#M
h'$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 $rmeters of stress rnge
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• The stress rnge is obtined b' Lod 1urtion
1istribution *L11+ method.
• Stress rnge is function of both e)ternl lod:uctutions nd ger rottionl s$eed.
• Stress c'cle counting method for gers is di"eretht of other structurl com$onents.
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Fatigue damage in bearings
• Bering life nd dmge clcultion is bsed onLundberg#-lmgren e;ution
• - is the d'nmic e;ui(lent rdil lod gi(en b'• L is the bering life de<ned s the number of
c'cles tht =>? of the berings chie(e under certin test conditions
• is 3 for bll bering nd 3.33 for roller berings• C is the bsic lod rting nd constnt for gi(en
bering• 1mge is obtinedb'
li is the number of lod c'cles in hourssocited %ith lod rnge -i
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!esults
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!esults• the com$rison fctor for ftigue dmge bet%een the t%o
turbines
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E;ui(lent B is
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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.
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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>
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THAN9 !D