月||lweesseeeweeswewel|f|we||||||| 一 肇I MCA The I nternati onalMari ne Contr ac tor sAs soci ati on 薪 S D p P e c i f C i c a t p i o a n b f o i l r i t Y 一 P o t s | |1|| 万 罗黔 _ . . } ; , , } } l les es wees 牢夔续 蛾 认 甘 毕 秘完 七众瑟‘ 讯 | ee| 杏 月乌蓬争要 蒯 沁片舟 哭黔粉{ 辫鲜热 案  ̄ 浓慰愁 | 提司 今月 一 汁 卜祥斗砰朴落攀二二二上二 一一 一︸一一奏蒙 一 份川扭 www. i mca-i nt. com I MCA M 1 401 t ev.I J une2 000 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS CONTENTS SPECIFICATION FOR DP CAPABILITY PLOTS Toe n s u r eas t a nd a r d i s a t i o ni nt h ep r o d u c t i o no fc a p a b i l i t ypl ot sI MCA h a sp r e pa r e dt h i ss pe c i f i c a t i o nf o rDPv e s s e l s .Theus eo f t h i ss t a nd a r d s pe c i f i c a t i o nwi l le na bl ead i r e c tc o mp a is r o no fi n d i v i d ua lv e s s e l ' s pe r f o r ma n c e sa n dp r o v i d ea ni n d i c a t i o no fs t a t i o nk e e p i n ga bi l i t yi na c o mmo nf o r ma t .Ther e po ti r s s u e di n1 9 9 7u p d a t e dDPVOA 1 0 7 , f o l l o wi n gi n p u tf ro mt h r u s t e rma n u f a c t u r e r sa nd f r o m i nd us t r y exper i ence. Th i sf u the r rr e v i s i o n ha sb e e n pr o d u c e db e c a u s er e vi s e d wi n d c oef f i c i e nt sha vebe e npubl i s hedi nAPIRP2SK a ndt he r ewe r ee r r o r s i nTa bl e3 ,s h o wno npa g e6印e a ka n dc r o s s i n gpe r i o d swe r et h e wr o ngwa yr o u n da n dha v eb e e nc o r r e c t e d )a n di nAp p e nd i x1 ,wh i c h ha sbe e nr e dr af te di npa tt r oma kei tcl ea r e r . Th i ss t u d ywa sp r e p a r e df o rI MCA b yGl o ba lMa it r i me ,un d e rt h e d i r e c t i o no fi t sMa in r eDi v i s i o nMa na ge me n tCo mmi t t e e . KEYWORDS LI TY PLOTS DYNAMICPOSI TI ONI NG CAPABI THRUSTERS WAVELOADS I MCA WI ND LOADS CURRENTLOADS I MCA Page1 SPECI FI CATION FOR DPCAPABI LITY PLOTS CONTENTS TABLE OF CONTENTS SECTION PAGE ENVI RONMENTALFORCES Wi nd 2 W aves Cur rent 2. THRU STERS TunnelThrust ers. . . . . . . . . . . . . . . . . . . . . . Rot at abl eThrust ers 2. 2 气j ︐‘ 4 . ︐‘ Gi l lJet s 与 Rudder s 2. 5 Ma i nPr ope l l e r s 2. 6 Powe r / t hr us tr el a t i ons hi p 3. FAI LURE CONDI TI ONS 4. PRESENTATI ON 11 5. REFERENCES 12 APPENDI X 1 APPENDI X2 Me t hodsofCa l c ul a t i ngWi nd, Wa vea ndCur r e ntFor ce s 13 S pe c i f i c a t i o nf o rFul l Sc a l eDPCa p a bi l i t yPl o t s 19 DPDat aSheet DPDa t aShe e t一c ompl e t e de xa mpl e I MCA Page2 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS ENVI RONMENTAL FORCES ENVI RONMENTAL FORCES Thec ompo ne nt sofe nvi r o nme nt a lf o r cea r e: - ( i ) wi nd ( i i )wa v e s ( i i i )c u r r e n t Ve s s e l o wn e r sc a ns o me t i me sp r o vi d ef o r c ec oe f f i c i e nt so b t a i n e dt h r o ug hmo d e lt e s t i n g , a n dwh e ne v e rp o s s i b l et h e s es h o u l dbeu s e di np r o d u c i n gt hec a pa b i l i t ypl o t .I f ho we v e r nomodelt es tresul t sareavai l abl et he nf orcess houl dbecal cul at edasbel ow. 1. 1 Wi nd Wi ndf o r c es houl dbeco ns i de r e dont heve s s e l ' shul l ,be l owt heuppe r mos tco nt i nuous d e c k, a n do nt h es u pe r s t r u c t u r ea b o v et h i sd e c k.Fo ran o n - c o n ve n t i o n a ls h i ps h a p ei . e . a Se mi - s ubme r s i bl et he nt het ot a lwi nda f f e c t e da r e aa tt heope r a t i ngdr af tha st obe c ons i de r e d. Fore i t he rc a s e,t hewi ndf or ce ss houl dbeca l c ul a t e dus i nga cc e pt e d s t a n da r d ss u c ha st ho s ei nr e f e r e n c e( 1 ) , wh i c ha r ea l s od e s c ibe r di nAp p e nd i x1 .The wi n ds p e e ds ho ul dbea1mi n u t eme a na tahe i g h to f1 0me t r e s .Thel i t e r a t u r es u g g e s t s t h a tao n emi n u t eme a nwi n ds p e e dc a nb ea p p r o x i ma t e dbe t we e n1 . 1 2a n d1 . 1 7t i me s t h eh o u r l yme a n,av a l u eo f1 . 1 5i sr e c o mme nd e df o rt h ep u r p os eo ft h e s ec a l c u l a t i o n s ( s e er e f e r e nc e s3a n d4f o re x a mpl e ) .I nc a l c u l a t i n gwi n da f f e c t e da r e a s , t h ef o l l o wi n g pr oce dur e ss houl dbef ol l owe d: a ) Thepr o j e c t e da r e aoft heves s e l ' shul l ,a nd/ oral lcol umnss houl dbei ncl ude d. b)S hi e l d i n ge f f e c t s h o u l dbea c c o u n t e df o r . c )Th ebl o c k e di np r o j e c t e da r e ao fs e v e r a ld e c kh o u s e sma ybeus e di n s t e a do f c a l c u l a t i n gt hea r e ao fe a c hi nd i v i d ua lu n i t .Howe v e rwh e nt h i si sd o n e ,as h a p e f act orof1. 10s houl dbeused. d )I s o l a t e ds t r u c t u r e ss u c ha sde r ic r k sa n dc r a ne ss h o ul dbec a l c ul a t e di nd i v i d u a l l y. e ) Op e nt r u s swo r kc o mmo n l yu s e df o rde r r i c kma s t sa ndb o o msma yb ea p pr o x i ma t e d b yt a k i n g60 %of t h ep r o j e c t e dbl o c ka r e aof o n ef a c e . O Th et u ni r ngmo me n tc a u s e db ywi n df o r c e sc a nbec o n s i d e r a bl e ,a n ds h o u l dbe e s t a b l i s h e db yr e f e r e n c i nga r e a sf ro mt h ev e s s e l ' sc e n t r eo f r o t a t i o n. g )T hewi ndve l o c i t yi n c r e a s e swi t hh e i g h ta b o v et h ewa t e r ,h e i g h tc o e f f i c i e n t sa s de t a i l e di nTa bl e1( r ef . 3)s houl dbeus e d. h )Sh a pec o e f f i c i e n t sf o ri n d i vi d u a la r e a sa ss h o wni nTa bl e2( r e f . 3 ) s h o u l dbeus e dt o scal et hewi ndf or ceondi f f er ents t r uct ur es. i ) Fo rv e s s e l se n g a ge di nt r e n c hi n g ,c a b l el a y i n g ,a n do t h e ro pe r a t i o n st ha tr e q u i r e c ons i der a bl ea ddi t i onalt e mpor a r ys t r uc t ur esa n al l o wa nc ef ora t ypi c a lwor ki ng s pr e a ds houl dbeus e d. j ) Fo rv e s s e l se ng a g e di no f f s ho r el oa d i n go rha v i n gmo r et ha no n eo pe r a t i o na l d r a f t , a t l eastt wodr af tcondi t i onss houl dbecal cul at ed. I MCA Pa ge3 SPECI FI CATION FOR DPCAPABI LI TY PLOTS ENVI RONMENTALFORCES 一 H e i g h t o f a r e a c e n t r o i d a b o v e w a t e r l e v e l } 一_ , F e e t }ev e r一 l o o t Ex c e e a mg 一 一 一 1 一 。 一 5 。 5 0 - 1 0 0 ‘ 0 0 - 1 5 0 ‘ 5 0 - 2 0 0 2 0 0 - 2 5 0 M et ers Ove r一No tExc e e di ng 0-15. 3 15. 3一 30. 5 30. 5- 46. 0 46. 0- 61. 0 61. 0- 76. 0 , . 4 。 一 1 . 4 7 刁 0 . 5 0 一 I MCA 一 D e c k h o u s e 1 . 0 0 一 1 · 。 。 一 l U n d e r d e c k a r 。 一 ( s m o o t h s u r f a c e s ) l U n d e r d e c k a r e a s ( e x p o s e d b e a m s a n d g i r d e r s ) 一 R i g d e r r i c k 1 . 0 0 一 1 . 3 。 一 1 . 2 5 1 一 Pa ge4 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS 1. 2 ENVI RONMENTALFORCES W aves On l ys e c o n do r de rwa vef o r c e sne e db ec o ns i d e r e df o rDPc a pa b i l i t y .Th ef i r s to r d e r f o r c e sa r en o tc ou n t e r a c t e db yaDPs ys t e ms i nc et h e s ea r eh i g hf r e q u e n c ya n dn e e dn o t bec o ns i d e r e d.I np r o d u c i n gc a p a b i l i t ypl o t sr e f e r e n c e( 1 )s u g g e s t st ha twa v ed r i f tf o r c e coe f f i ci e nt sc a n bes c a l e df r om da t aa va i l a bl eo n ot he rves s el s ,a nd r e f e r e nce( 2 ) p r o v i d e sas e to fr e g u l a rwa v ed r i tf f o r c ec o e f f i c i e n t sf o ras ma l lmo n o h u l lv e s s e l .I ti s a c c e p t a bl ep r a c t i s et os c a l et h ef o r c ef ro mo n ev e s s e lt oa n o t h e rp r o vi d e dt h e ya r eo fa r e a s o n a bl ys i mi l a rh u l lo rc o l u mns h a p e . Al t e na r t i v e l yi fmo d e lt e s td a t ai sn o t a v a i l a bl e , t he nah y d r o d y n a mi cc o mp u t e rp r o g r a mmec a np r o v i d et her e l e v a n tf o r c e s . Ther e l a t i o n s hi pbe t we e ns i g n i f i c a n twa v ehe i g h t ,pe io r d ,a n dme a nwi n ds p e e dwi l v a r yd e p e n d i ngo nt h eo pe r a t i n gl o c a t i o noft heve s s e l .Ho we v e r ,f o rt hes a k eo fu n i t y wi nda ndwa v ed a t as h o u l db eba s e do nas i ng l es e to fd a t a ,a ndi ti sr e c o mme n de dt ha t a ve r a g e dv a l ue st a ke nf ro mNo thS r e ad a t ai su s e d .Ta bl e3p r e s e n t sNo thS r e a( Fo ti r e s ) da t a( whi c hi sa va i l a b l ef ro mh i s t o ic r a lr e c o r d s )a n dt hec o r r e s p o n d i ngr e l a t i o n s h i p b e t we e ns i g ni f i c a n twa v ehe i g h t , wi n ds p e e d( 1mi n u t eme a n) , p e a kp e r i o da n dc r o s s i n g pe iod.I r ti si mpo ta r ntt onot et ha tt heNor thSe ada t ai ncl udess wel l ,whi c ht e ndst obe a r o u ndl m, wi t ht h ef o l l o wi n gr e l a t i o ns h i p. Hs Z=H, ' .+Hs z ' .1 1 1. 3 Current Th ec u r r e ntf o r c ee xe te r do nav e s s e li sa s s u me dt ober e l a t i v e l ys t e a d y.Thef o r c ec a n bec a l c ul a t e da ss h o wni nr e f e r e n c e( 1 )a n di nAp pe n d i xI , o rba s e do nt h er e s u l t sf r o m m odelt est s. [ MCA Pa ge5 ENVI RONMENTALFORCES SPECI FI CATION FOR DPCAPABI LITY PLOTS Si g. Wa veHe i ght Cr os s i ngPer i od Peak Peri od Mea nWi ndSpe e d Hs( m) Tz( s ) Tp( s ) Vw( m/ s ) 0 0 0 0 1. 28 4. 14 5. 3 2. 5 1. 78 4. 89 6. 26 5 2. 44 5. 72 7. 32 7. 5 3. 21 6. 57 8. 41 10 4. 09 7. 41 9. 49 12. 5 5. 07 8. 25 10. 56 15 6. 12 9. 07 11. 61 17. 5 7. 26 9. 87 12. 64 20 8. 47 10. 67 13. 65 22. 5 9. 75 11. 44 14. 65 25 11. 09 12. 21 15. 62 27. 5 12. 5 12. 96 16. 58 30 13. 7 17. 53 32. 5 14. 42 18. 46 35 15. 49 I M CA Page6 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS 2. THRUSTERS THRUSTERS On eof t h el a r g e s t d i s c r e p a nc i e s , whi c hc a no c c u ri nt hepr o d uc t i o nofc a p a b i l i t ypl o t s , i s l i k e l yt ob ei na s s u mi n gt h r u s t e re f ic f i e n c i e s ,a n di nt h et h r u s t e rmod e l . Th ef o r c e o u t pu tf ro mat h r u s t e rc a no n l yr e a s o na b l yb ed e t e r mi n e df r o mf u l l - s c a l eb o l l a r dt ia r l s , b u ts i nc et he s ea r eo te f nn o ta v a i l a bl e , a s s u mp t i o nsh a vet ob ema d er e g a r d i n ge f f i c i e n c y a n da c t u a lf o r c eo u t p u tt omo v et hev e s s e l .Toe ns u r ec o n t i n u i t yi nt hi sa s p e c t wewo u l d r e c o mme n dt hef o l l o wi ngi nl i e uo ff ul l - s c a l eb o l l a r dr e s u l t s .Ho we ve r ,i ft h et h r u s t e r e f f i c i e nc yi sk no wnt obepo o rt h e nt h ef o l l o wi n gf ig u r e sma yber e d u c e da c c o r d i n g l y. 2. 1 TunnelThrust ers Tu n ne lt h r u s t e re f f i c i e n c ys h o u l db ea s s u me dt obeI I k g / h p( t h i sf ig u r ei n c l u d e sa n a l l o wa n c ef o rt u n n e ll o s s e s ) .Tu n ne l t hr u s t e r sc a nbea s s u me dt og i vei d e n t i c a lt h r u s ti n po s i t i v ea n dne g a t i v ed i r e c t i o n s ,u nl e s sma n u f a c t u r e r ' si n f o r ma t i o ns a y so t he r wi s e .Fo r t h epu r p o s eo ft h e s ec a l c u l a t i o n st het h r u s td e g r a d a t i o nd uet oac u r r e n tf lo wa c r o s st h e t hr us t e rma ybei gnor e d. 2. 2 Rot atabl eThrust ers Rot a t a bl et hr u s t ere f f i c i e nc yi sas s umedt obe1 3 kg/ hpf ora he adpi t c h,a ndar ed uct i on t o8kg / h pi ft hep i t c hi sr e v e r s e ds u c ht h a twa t e rf lo wi so v e rt heh u b .I ft h r u s t e r - h u l l i n t e r a c t i o ni sl i k e l yo rk n o wnt ob es i g n i f i c a n tt h e na na l l o wa nc es h o u l db ema d ef o ri t . Toa c hi e v et h emo s ta c c u r a t ec a p a b i l i t ypl o t , t h et h r u s t e rmo d e ls ho ul dt a k ei nt oa c c o u n t t het h r u s t e ra l l oc a t i o na l g o it r h mu t i l i s e di nt h eDPs y s t e m.Fo re x a mpl e , i fi ti su s u a l p r a c t i s et oa l wa ysr u nt het h r u s t e r si naf i x e dmo d et he nt hi sha st ob et a k e ni n t o a c c o u n t . Ba r r e dz o n e sf o rf u l l yr o t a t a bl et h r u s t e r sc a nl i mi tt heu l t i ma t ep o s i t i o n h o l di n gc a p a b i l i t ya ndmus tbei n c l u d e d.TheDPt h r u s t e ra l g o it r h mma ya d o ptb a r r e d z o n e st op r e ve n tt h r u s t e r / t h r u s t e ri n t e r a c t i o no rt h r u s t e r / p os i t i o nr e f e r e n c ed e g r a d a t i o n , s pe ci f i c a l l yf orac ous t i c,a ndt a utwi r er e f e r e nce s . 2. 3 Gi l lJet s Gi l l j e t sc a nb es i mu l a t e da sr o t a t a b l et h r u s t e r s , b u twi t hat h r u s t t op o we rr e l a t i o n s hi po f 8kg/ hp. 2. 4 Rudders i fr u d de r sa r ei n c o r p o r a t e di n t ot h eDPc o nt ro ls y s t e mt h e nt hee f f e c tc a nb es i mul a t e d wi t hat u n n e l t h r u s t e rp l a c e da t t her u d d e rs t o c k.Th er a t i n go ft h et u n n e lt h r us t e rs ho u l d bec a l c u l a t e db a s e do nt h ema x i mu ml i ta f va i l a bl ef ro mt her u d d e r .I fnop e r f o r ma n c e f i g u r e sa r ea va i l a b l e , t h ea t h wa ts r h i pst h r u s ts ho ul db ea s s u me da s3 0%o ft h ema x i mu m a s t e nt r h r u s tf ro mo n ep r o p e l l e r ,( v e s s e lmo v i n ga s t e n)a r s s u mi n gt h eo t he rpr o pe l l e r wi l lpr o v i dea he a dt h r u s tt oc o u n t e r a c tf o r wa r dmo t i o ni . e .p us h / p ul lmo d e . The pe r f or ma nc eo fs p e c i a lr u d d e r ss u c ha sBe c ke ro rS c h i l l i ngd e s i g nss ho u l dbec a l c u l a t e d i nt hes a mema nne r ,orba s e donr es ul t sf rom f ul l - s c a l es e at ia r l s . 2. 5 Ma i nPropel l e r s Th e s ea r el i k e l yt oh a veh i g he f f i c i e nc ya nds u f f e rl i t t l ei n t e r a c t i o np r o bl e mswi t he i t h e r p o s i t i o nr e f e r e nc e so ro t he rt h r u s t e r s .Fo rma i np r o pe l l e r sa ne f f i c i e nc yo f1 3 kg / h p s houl dbea s s umeda ndt hea s t e nt r hr us tl i mi t e dt o70% whe npr opel l e r sa r er e ve r s e d. I MCA Pa ge7 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS 2. 6 THRUSTERS Po we r / t hr u s tr e l a t i o n s hi p I ff ul lpo we rt ot het h r u s t e r sc a nno tb ed e v e l o pe d ,t he ni ts ho u l dbea s s u me dt ha tt he t h r u s to u t p u ti sp r o p o ti r o n a l t ot h es q u a r eo f t h ep r o pe l l e r ' spo t e n t i a l s pe e d , N( r p m) : T aNZ Fo rac o n t r o l l a bl ep i t c hp r o pe l l e r , t h er e l a t i o n s h i ps h o u l db et h a tt h r us ti sp r o p o ti r o na l t o p i t c h( P%)t ot hep o we ro f1 . 7. T aP" I MCA Pa ge8 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS 3 FAI LURECONDI TI ONS FAILURE CONDITIONS Fo rs o meo pe r a t i o nst heI MCAg u i d e l i n e sr e q u i r et h a ta f t e rt h ewo r s tc a s ef a i l u r e ,t he v e s s e ls h a l lma i n t a i ns u f f i c i e n tc a pa b i l i t yt or e ma i no np o s i t i o nwi t hi ns a f el i mi t s .Fo r l e s ss e io r uso pe r a t i o n, t h i si sn o tar e q u i r e me n t .Thewo r s tc a s ef a i l u r ec o n d i t i o nwi l l be d i f f e r e n tf o ri n d i vi d ua lv e s s e l sa n di sus u a l l yi d e n t i f i e dt h r o u g haFa i l u r eMo d ea n d Ef f e c t sAna l y s i s( FMEA) .Fo r mo s tv e s s e l st hewo r s tc a s ef a i l u r ewi l l bet h el o s so fo n e e ng i n er o o mo ro n eha l fo ft h ema i ns wi t c h b oa r d ,wi t ht h ec o ns e q ue n tl o s sofha l ft he avai l a bl ed- rust ers.Thet hr us t e rdi s t ibut r i ona vai l a bl eaf t e rt hewors tcasef ai l ures houl d l e a vet heves s e lbo t hf or e- a f ta nda t h wa ts r hi pst hr us t . The wors tcase f ai l ur es houl d be i de nt i f i ed f oreach ves seland used as abas i sf or d e t e r mi n i n gt hewe a t h e rc a p a bi l i t ys u i t a bl ef o rDPo pe r a t i o n s .I ts ho ul db eke p ti nmi n d t ha tt hewo r s tc as ef a i l ur emodema ynotbec ons t a ntbutca nva r yde pe ndi ngont he v e s s e l she a d i n g.I f s u c hac a s ed o e sa r i s et h e nt hemi n i mu mwe a t he re n ve l o pes h o u l dbe pl o t t e db a s e do na na ma l g a ma t i o nofa l lt hewo r s tc a s ef a i l u r e s .Ane x a mpl es h o wi n g t hi si sgi ve nove r l e afi nFi gur e1 . I MCA Pa ge9 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS FAI LURE CONDI TI ONS Q 户厂1 权丫 厂\ \ 火 / /声 丫 / \ \ \ ︑︑︑︑\ 20- 30一一一 40- 50 一 30- 40- { /\\ 、 了 广 乍、 i : 丫 / / / 牙 ︑ ︑ \ \ /- ︐ \ / ︑ 10- ︑︑︑ 气一 ̄ 杯 /\ \ \ \ \ ︑ ︑ 犷﹄ 曰 ︑ ︑ \ 八1 月 / / 1 丫/ /气 / 长、 / 一 \ // 了 180 0- - 90 40- 50 g0 \一 1 8 0/ Fi gur e1一Eva l uat i onofDPCapabi l i t yatCombi ne dWor s tCas eFai l ur e I MCA Pa ge1 0 SPECI FI CATI ON FOR DPCAPABILI TY PLOTS 4 PRESENTATION PRESENTATION Th es t a n d a r d i s e dp r e s e n t a t i o no fr e s u l t si se s s e n t i a l , s i n c ei te na b l e sad i r e c tc o mp a r i s o n be t we e nve s s e l s .I ta l s oe n s u r e st h a tv e s s e lc a pa bi l i t i e sa r ep l o t t e dwi t hs i mi l a r c o nd i t i o nsa n de q u i va l e n tf a i l u r emo d e s .Thef o l l o wi n gp o i n t sc o n c e ni r n gc a p a bi l i t y pl ot ss houl dbea d he r e dt o. a )Pl ot ss houl dbepr oduc edi nPol a rf or m,wi t hawi nds pe e ds ca l ebe t we e n0a nd50 m/ s( 15 mm =1 0m/ s ) . on. The b)Wi nd,wa vesa nd c u r r e nt ss ho ul d be as s ume dc oi nc i de nti n directi c o r r e l a t i o nb e t we e nwi nda n dwa ve ss h o u l db ea sg i ve ni nTa b l e3. Thecurrent s pe e ds houl dbeas s umedt obe1knota ndi nva ia r ntwi t hde pt h. c )Th el i mi t i ngwi nds pe e ds h o ul db epl o t t e da tl e a s to n c ee ve r y1 5d e g r e e sa r o u ndt h e ve s s e l .Li ne a ri n t e r p ol a t i o nb e t we e npo i n t si sa c c e p t a b l e . d )Ami ni mu mo ft wopl o t si sr e q u i r e d ,un d e rt h es a mewe a t h e rc o n d i t i o ns ,Pl o t1 s h o u l dbewi t ha l ls y s t e msf ul l yf u n c t i o na l , t ha ti sa l lt h r u s t e r sa b l et od e ve l o pt h e ma x i mu mt h r us ta sr e q u i r e d.Pl o t2s ho u l dbep r o d uc e do nt h es a mes c a l ea sPl o t1 a ndr e pr es entt hewor s tca s ef a i l u r emode ,ora na ma l ga ma t i onoft hewo r s tc a s e s . I MCA Pa ge11 SPECI FICATI ON FOR DPCAPABI LI TY PLOTS REFERENCES REFERENCES 1 .Ni e nh ui sU," Si mul a t i o no fLo wF r e q ue nc yMo t i o n so fDy na mi c a l l yPo s i t i o ne d Of f s ho r eSt r uc t ur es ", RI NA,1 986 2.Eng l i s hJ& Wi s eD," Hyd r o d y na mi cAs pe c t sofDy n a mi cPo s i t i o n i n g " ,NECEI S 1975 3 ." Re c o mme n de dPr a c t i c ef o rDe s i g na ndAna l y s i so fS t a t i on k e e p i n gS ys t e msf o r Fl o a t i ngS t r u c t u r e s " , API2 S K( RP2 S K) , 2 n dEd i t i o n ,1 9 9 7 4.砚KDEN 4t hEdi t i onGui de l i ne s Dn V, " Ru l e sf o rc l a s s i f i c a t i o no fs t e e ls h i ps " Mod u( I MO)Code 7 .Ll o yd s" Ru l e sa n dRe g ul a t i o nsf o rt hec l a s s i f i c a t i o no fs t e e l s h i ps " I MCA Pa ge1 2 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS APPENDI X1 APPENDIX I METHODSOFCALCULATI NGWI ND, WAVEANDCURRENTFORCES ( e q u a t i o n sa r ea v a i l a bl ei nr e f e r e nc e s1 , 2, 3, 5a nd7 ) I MCA Page1 3 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS APPENDI X 1 L AXISSYSTEM Xi spo s i t i v et o wa r d sbo w, Yi spo s i t i vet o wa r d spo ta r n dZi spo s i t i veu p wa r d s .The r e l a t i v ee n v i r on me n ta ng l e ,a ,i spo s i t i v ea n t i - c l o c k wi s es t a r t i n gf r o mt h es t e r n . Moment sa r epos i t i vea nt i - cl oc kwi s e. Y I MCA Pa ge1 4 SPECI FI CATION FOR DPCAPABI LI TY PLOTS APPENDI X 1 2.W I ND FORCES Fo r c e so nahu la r ec a l c u l a t e df ro mt hef o l l o wi ngf o r mu l a e : F w x ( h u l l ) =y 2 ' O V 2 C .( a w ) A T ( h u l l ) F N S , ( h u l l ) 一' 2 P V W Cw y ( a w ) A L ( h u l l ) Fw( h u l l ) =' z pv W Cw n ( av ) A L ( " U " Op wher e F. ,( . h u l l ) 凡( h u l l ) 凡, :( hul l ) al =wi n df o r c ei ns u r g e =wi n df o r c ei ns wa y =wi ndmome nt =wi nddi r ec t i o n 卜J 了 ︻ 乙 ︐ 产︑ ︑ 产 产夕了 声 ︑ ︑ 今1 ︐1 ︐︼ ︑1 卜且 了 ︐‘ 2砚 ︑ =l e ngt hbe t we e npe r pe ndi c ul a r s r二 LBP 了r︑ =l o ng i t u d i na l wi nda r e ao fh u l l 十上 AL 为1 =wi nds pe e d =t r a ns ve r s ewi nda r eaofhul l ︑ 沪 J.︑ 了J勺 =d e n s i t yo fa i r( 1 . 2 3x1 0 - 3 ) V , , AT . 个L P ( de g r e e s ) 2 ‘ C,Cy ,吼。 =h u l l wi n dc o e f f i c i e n t sf o rg i v e nwi ndd i r e c t i o n s ( kN) ( k N) ( kNm) Th ewi n df o r c ec o e f f i c i e n t sa r eg i v e ng r a p h i c a l l yi nr e f e r e n c e( 1 ) .Ho we v e r , t h e yc a nbe c o nv e n i e n t l yr e p r e s e nt e db yt h ef o l l o wi nge x p r e s s i o n s : Cw x ( aw ) =0 . 4 2 3 c o s ( aw ) C w y ( a w ) 一0 . 8 s i n ( a w ) Cw n ( aw ) =- 0 . 1 4 3 s i n ( 2 aw ) Wi ndf o r c e so nt hes u p e r s t r u c t u r ea r ec a l c u l a t e du s i n gt h eAPIme t h o dg i v e ni n r e f e r e n c e( 3 )wh e r e b ye a c hc o mpo ne n toft hes u p e r s t r u c t u r ei sg i v e nap r o j e c t e d l ongi t udi nala ndt r a ns ve r s ea r e a ,as ha pecoe f f i ci e nta ndahe i ghtc oef f i c i e nt .Thewi nd f or ceone ac hc ompone nti st he nf oundf ro m; F w x ( s s ) 二C w ( C s C h A T ( s s ) ) v w Fr y , ( s s ) =C W ( C S C h A L ( s s ) w w where CN , CS 矶 ATs s ) AL ( S S ) =API wi ndc o e f f i c i e n t( 0 . 61 5x1 0 - 3 t og i v ef o r c ei nk N) 二s ha pec oe f f i c i e n t =he i g h t c o e f f i c i e n t 二s u p e r s t r u c t u r et r a ns v e r s epr o j e c t e da r e a ( m) =s u pe r s t r u c t u r el o ng i t ud i n a l p r o j e c t e da r e a ( mZ ) Th ewi n dmo me nto nt hes u pe r s t r u c t u r ec o mpo ne nt si sc a l c u l a t e db ymul t i pl y i n gt he t o t a l t r a ns v e r s es u p e r s t r u c t u r ef o r c eb yt hed i s t a n c eo f t h ec e n t r o i do ft het o t a l t r a n s ve r s e s u pe r s t r u c t u r ea r e af ro mmi d s hi p s , a n dc a nb ee x p r e s s e da s ; I MCA Pa ge1 5 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS APPEND I X 1 F " " ( S S ) 一F ,( s s ) Xw , where Xw , =di st ancebet weencent r oi doft ot alt ra ns ver se ( m) s u pe r s t r u c t u r ea r e af ro mmi d s h i ps Wi ndf o r c e so nt hes u pe r s t r u c t u r ef o ri n t e r me d i a t ehe a d i ng sbe t we e n0a n d90d e g r e e s a r eo b t a i ne dus i ngt heAPIi n t e r p o l a t i o npr o c e d u r eg i ve ni nr e f e r e nc e( 3 ) .Thi ss u g g e s t s t ha t ; 二, _ , 、 _。( n n 1 12 s i n 2 ( a , , ) 飞. 二‘ I T2 C O S Z ( a , )1 t1 武"Wl‘` 1 "t '"1 1了二刃一 药二丁可},1' w xk"/ l, 二刃汀二一i! L工宁b i l l、 “*) 」 L'- rL ; vbk "-) ] wher e ︑ 1 了 ︑! 尹 ︑.J ︑ Fw x( 0 ) ︑ 21 凡( 90 ) =r e s u l t a n t wi ndf o r c ea t he a d i n ga n g l ea W =wi ndf or c ei ns wa y =wi ndf or c ei ns ur ge ( de gr ee s ) 了1 Fw( a) =wi ndhea di nga ngl e 了.︑ aw Th el o n g i t ud i n a la ndt r a n s ve r s ec o mp o n e n t sa tt heh e a d i n ga n g l eaWa r eo b t a i n e db y r e s ol vi ngt her es ul t a nt . F w x ( a w ) 一 F W ( a jc o s a W F w , ( a. ) =F w ( a , , ) s i n a w Th ewi ndya w mo me n to nt h es u p e r s t r u c t u r ea ti nt e r me d i a t ehe a d i nga ng l e sawi s o b t a i ne db ymu l t i p l yi n gt het r a n s v e r s ec o mpo ne n t b yt h el e v e ra r mo ft hea r e a . F w n ( aw ) 一F ,( a W ) X, " I nc a l c u l a t i n gt hewi n df o r c e so nave s s e la na l l o wa n c es h o u l dbema d ef o rt hef a c tt h a t wi n ds p e e di sno tc o ns t a n ta ndi ss u b j e c t t og u s t s .Thewi n ds p e e ds h o u l dbea1mi n u t e me a na tahe i g h to f1 0me t r e s .Th el i t e r a t u r es ug g e s t st h a tao nemi n u t eme a nwi nd s pe e dc a nb ea pp r o x i ma t e db e t we e n1 . 1 2a n d1 . 1 7t i me st h eh o u r l yme a n,av a l ueo f 1 . 1 5i sr e c o mme n d e df o rt h ep u r po s eo ft he s ec a l c ul a t i o n s( s e er e f e r e nc e s3a n d4f o r e xa mpl e) . I MCA Pa ge1 6 APPENDI X1 SPECI FI CATION FOR DPCAPABI LI TY PLOTS 3.W AVE DRIFT FORCES Da t aa v a i l a bl ef o ras i mi l a rv e s s e li ss c a l e da c c o r d i n gt ot h eme t h o ds u g g e s t e di n r e f e r e nc e( 2 ) , wh i c hi so u t l i ne db e l o w. 一 曰 旧 仃 Fr eq ue nc yi snon- di me ns i ona l i s e dt hus : 一一 O) 必 wher e (0 V g 二di me ns i onalf re que nc y ( r a ds / s e c ) =v o l u meo fd i s p l a c e me n t 二a c c e l e r a t i o no fg r a v i t y( 9 . 81 ) ( m3 ) ( /s M Z ) Wavedr if tf orcecoef f i ci ent sa renon- di mensi onal i sedt hus: - C, , , ( o r F, , , , ( o r 瑞 ) C, , , y ) =1 ' 万 - · . . g . P p . a s Y 3 Z where p蠕Cwvx =wa vea mpl i t ude ( m) 二d e n s i t yo f wa t e r( 1 . 0 2 5 ) Wi n , ) =d if r tf o r c ei nr e g u l a rwa v e s =n o n - d i me n s i o n a l r e g u l a r wa v ed r i tf f o r c e ( N) k ( k N/ m2 ) coef f i ci ent Wa vedr if tya wmome ntcoe f f i c i e nt sa r enon- di me ns i ona l i s e dt hus : - 万· 9. p aZ V 2 一3 C , , 、一 互 F, , , v 艺 wher e a =wa vea mpl i t ude ( m) p =d e ns i t yo f wa t e r( 1 . 0 25 ) Wi n ) F., n 二d if r ty a wmo me n t i nr e g ul a rwa v e s ( k Nm) Cw v n 二n o n - d i me n s i o n a l r e g u l a rwa v ed if r tmo me n t ( k Nm/ mz ) coef f i ci ent I MCA Pa ge1 7 SPECI FI CATI ON FOR DPCAPABI LI TY PLOTS APPENDI X1 4.CURRENT FORCES Cu r r e n tf o r c e so nah u l la r ec a l c u l a t e dus i ngt heme t h o ds u g g e s t e di nr e f e r e n c e( 1 ) . Non- di me ns i onalc u r r e ntf or c ec oe f f i c i e nt sf o rava ie r t yofve s s e l sa r egi ve nove ra r a ngeofhe adi ngsf rom0一18 0de gr e e s .Thes ea r er e - di me ns i o na l i s e dasf ol l ows ; F,二' z Pv ' CC Z ( a} ) . B. T F , y一' z P V , ' C , , ( a , ) . L B P . T F c n=' z ) g v ' C , n ( a} ) . T. L B P2 wher e 凡凡Fcn ac =c ur r e ntya w mo me nt =cur re ntdi rect i on ( kN) ( kN) ( kNm) ( de gr e e s ) =hul lc ur r e ntcoe f f i c i e nt sgi ve nf o rc ur r e nt di rect i ons =d e n s i t yo fs e awa t e r( 1 . 0 25 ) =c ur r e nts pe e d =ves s e ld r a t f =ves selbeam =l e n g t hbe t we e np e r pe nd i c u l a r s ( t hn ' ) 耐m)m)m) 户vc ︒"LBP Cl } X ,心 Cc n =c u r r e ntf or cei ns ur ge =c ur r e ntf or cei ns wa y Cur r e ntf o r c e ss houl dbea p pl i e da sca l c ul a t e dwi t hc ur r e nts pee das s ume dc ons t a nt . I tshoul dbenot edt hati ns hal l ow wat ert hecur r entf or ceswi l li ncr easeasaf unct i onof unde r he elc l e a r anc e,s e eOCI MFf ort a nke r s . I MCA Pa ge1 8 SPECI FI CATION FOR DPCAPABI LI TY PLOTS APPENDI X2 APPENDI X2 SPECIFICATION FOR FULL SCALE DP CAPABILITY PLOTS & DPDATA SHEETS I MCA Pa ge1 9 TheI nt er nat i onalMar i neCont r ac t or sAssoci at i on ! iC= Representsoffshore,marineandunderwaterengineeringcompanies. SPECIFICATION F旦R卫卫LLSCALE卫PCAPABI LI TY里LQ工S G l o b a l Ma r i t i meo r o t h e ro r g a n i s a t i o n s ma yh a v e p r o v i d e dc a l c u l a t e dDPc a p 色l i t yp 护i s 吵i s 卜 : 梦 y c o n v e n t i o n , a s s u me c o i n c i d e n t wi n d , c u r r e n t f o r c e s a n daf u l l yd e v e l o p e 呼s e a .’ 竺e s 气 p l o t ss n o u l ag e u s e d , pa ti r c u l a r l yt hewo r s tc a s es i n g l ef a i l u r ep l o t ,t oma r ka c t ua lc a p a b i l i t y .1 ner o l i o wi n gma r x s canbeused: VESSEL MAI NTAINED POSI TION WI THOUT HEADI NG OR DATE POSI TI ONALARM ( 20 , 2m) VESSELLOSTPOSI TI ON VESSELRECOVERED POSI TI ON AFTER I NI TI ALLOSS NOT万二 DATE WI ND W AVE CURRENT The s et e s t ss h o ul dbema d ewi t hh i g hg a i n, i n1 5 0s t e psf ro m0 0 0 0 ,a ndi nt h ec o r r e c two r k i n gmo d e , i . e .c r a ne sr a i s e d ,a nda to pe r a t i o na ld r a t.A s f e p a r a t ep a ges ho ul db ema r ke df o ro t he rwo r k i n g c o n d i t i o ns .Wh e nt h ewe a t h e ri s2 5k n o t sa ndi n c r e a s i n gy o us ho u l dbea bl et og e taf u l lc a pa b i l i t y p l o to ra tl e a s t1 8 0 0 .I ti si mp o ta r n tt oma kes u r et hep o s i t i o ni ss t e a d ya tt het i meo ft h r u s t e r d e s e l e c t i o n.Toa v o i dg e ne r a t o rl o a dpr o bl e mst het e s t ss h o u l db ec a r r i e do u twi t ht h eb u st i ec l o s e d. Fo re a c ht e s t t h e r es h o ul db eano t eb e l o wt hep l o tg i v i ngd e t a i l so ft h ewa v ea n dc u r r e nt d a t e .I d e a l l y t h ewa v ed a t as h o u l dc o mef ro m awa ver i d e rbu o ybu ti fabu o yi sno td e pl o y e dt hes e aa n ds we l l s houl dbees t i mat edandcheckedl at erwi t hweat herdat a. C a r i v i e H o u s e , 2 3 5 V a u x h a l l B r i d g eR o a d , L o n d o n , S W1 V1 E J , U K T e l : + 4 4( 0 ) 2 0 7 9 3 1 8 1 7 1F a x : + 4 4( 0 ) 2 0 7 9 3 1 8 9 3 5E - ma i l : i mc a @i mc a - i n t . c o mWe b s i t e : ww w . i m c a - i m. c o m I n c o r p or a t i n gAOD Ca n dDP VO A V ATRe g i s t r a t i o nNo:GB6 53 3 3 9 8 2 3 TheI nt er nat i onalMar i neCont r act or sAssoci at i on Repr esent sof f shor e,mar i neandunder wat erengi neer i ngcompani es. DP DATA SHEET CO M PANY VESSEL DATE 一 D a t e a n d t y p e o f D P c o n t r o l s y s t e m ( s ) i n s t a l l a t i o n D a t e 一 L a s t I M C A A n n u a l A u d i t 一 N u m b e r o f , Engi neRooms ? } A r e _ s u p p o ts r y s t e m s n o r m a l l ys e p a r a t e t o e a c h 一 e n g i n e r o o m ? { C a n t h e v e s s e l o p e r a t e w i t hs e g r e g a t e d m a i n W i t n e s s Ge ne rat or s? 一 F r e s h W a t e r S y s t e m一 FuelOi l Lub Oi l 一 e l e c t r i c a l s y s t e m s ( B u s - T i e s o p e n ) ? } S t a t e ma n u f a c t u r e r a n d t y p e o f p o w e r 一 m a n a g e m e n t ( P M ) s y s t e m , “ f i t t e d . 一 ‘ s P Ms y s t e mf u l l y r e d u n d a n t i f m a i n 一 s w i t c h b o a r d s s e g r e g a t e d ? } A r e t h e c o n t r o l s u p p l i e s t ot h ee n g i n e s a n d 24V 一 s w i t c h b o a r d s s e p a r a t e n a d r e d u n d a n t ? TautWi r e Acoust i c 48V 110V R a d i 。 2 4 0 V一 O t h e r 一 一 M a n u a ‘ 一 M a n u a ‘ 一 Generat or s 13 5 7 9 2 4 6 8 10 一 W h e n w a s F M E A c a r i e d o u t ? D a t e B y Ca r l y l eHo u s e , 2 3 5Va u x h a l l Br i d g eRo a d , L o n d o n , S W1 V1 E J , UK T e l : + 4 4( 0 ) 2 07 9 3 18 1 7 1F a x : + 4 4( 0 ) 2 07 9 3 18 9 3 5E - ma i l :i mc a @i mc a - i n t . c o m We b s i t e :www. i mc a - i n t . c om I nc or por a t i ngAODCan dDPVOA V ATRe gi s t r a t i o nNo :GB6 5 3 3 3 9 8 2 3 一 heI nt er na t i onalMar i neCont r act or sAssoci at i on I MCA T Repr es en t sof f s hor e,ma r i neandun der wa t erengi neer i ngcompani e s. DP DATA SHEET DATE COMPANY VESSEL 】 L a s t I M C A A n n u a l A u d i t { N u m b e r o f , I A r e _ s u p p o ts r y s t e ms n o r ma l l y s e p a r a t e t oe a c h 一 e n g i n e r o o m ? } C a n t h e v e s s e l o p e r a t e w i t h s e g r e g a t e d ma i n Dat e / 0/2/97 Wi t ness GM FuelOi l Fr es hWa t e rSys t e m YC5 YC5 LubOi l YC5 一 e l e c t i r c a l s y s t e m s ( B u s - T i e s o p e n ) ? I S t a t e m a n u f a c t u r e r a n d t y p e o f p o w e r } m a n a g e m e n t } r l v i ) s y s t e m , “ n u e a . 】 I s P Ms y s t e mf u l l y r e d u n d a n t i f ma i n 一 s w i t c h b o a r d s s e g r e g a t e d ? } A r e t h e c o n t r o l s u p p l i e s t o t h e e n g i n e s nd a 一 s w i t c h b o a r d s s e p a r a t e n a d r e d u n d a n t ? 24V YC5 48V N似 2 4 0 V 110V YC5 N / A 一 Ta utWi r e Radi o 2x5加 只APLWT四 八只TEMI S1 1 1 Acoust i c HPR劲 9 Ot her5Y I -COT STH90UGH PSEUDOARTEMI 5 Ma nu a l N / A Ma n u a l Y e s Gener at or s 河 X9I 了了’ K’79 、246 24618 1 0 Da t e o/4/f I 5 Ca r l yl eH ou s e , 2 3 5Va u x h a l l Br i d g eRo a d , L on d o n , SW1 V1 E J , U K By GM T e l : + 4 4( 0 ) 2 07 9 3 18 1 7 1F a x: + 4 4( 0 ) 2 07 9 3 18 9 3 5E - ma i l :i mc a @i mc a - i n t . c o m We b s i t e :www. i mc a - i n t . c om I n c or p o r a t i n gAODCa n dDP VOA VATRe g i s t r a t i o nNo :GB6 53 3 3 9 8 2 3 } 一 } !