A guide to ship handling 4

S p @!l!:s:F{n e#;'iD\ ii Folloqrsedasddire s$ Stability ofShips ldtrd or,!i'iy G.$d ft bnoyinry ldiig or rlt csrs or bL oy.nc Bbc Ih... -2 sillifi cad wave heigh rlLt sigtrinsd *Nc bcid

S p @!l!:s:F{n e#;

'iD\ ii Folloqrsedasddire s$

Stability ofShips

ldtrd or,!i'iy G.$d ft bnoyinry ldiig or rlt csrs or bL oy.nc) Bbc

Ih ro$r oi orlnuorgm!i! G lilrh! cflter or bnoyoly B s rhc seol

nll| rorc tr Nir mov.lo l Posfon B

rllldnfl W aod !d YMi.xUI r on

ldiig up\nt\ 'busl, B, Nlrcnft \

inryine rlE d sDhlo! w b) rl)c nghthg LlkrGZ \$L$,5rlr lrnzonkldinun!! btr**r rhc ft

hi

i heiehr is kmw0 rhe g|liig mommr.ri b! foNd by mdiDtying rh rishrif! hB Gz by

B i g h l i n g m o m e n l E W G Z = W G M s l ,

Fig.4l

rearE nlFnq d rc'reMc eish,

of buoystrcy BM is iidjcdcd hy rhc

for-BIM : K?

rh|di\rrkcor ofrhc\hDx Gz (rtE kuh

ndr.fui.h.rskGMr i\ sLlLn lcry mushty m

'.t:

li

t

@ $ , r H " d , " , , " $ " , " ,

Basic Elem€nts of Rcgular Wrves

rie+{ (r) ind FiFj ,l (b) dcpid hlmdni wloi l frcm ,vo ditreEd peBp€rives

Fic.l l {r) sio*s rhl wlvc prcrik (wirh qav rnprin'de, a, 8id

vM reu$ r ) ,s a iuncrion ordisrai

Fis.l-l (b) shNs rinc ruryd or rhc u\r 0mfik (virh *rv ampli,

tude, a ind Mve ffqlem, c) dbltflar r onc rocatron

r A $rvcshichcnDotnrisrh€ sen.nd towsrsu {.poi ndcturgh

om rhc $ill wdi lcd ro rhc fe$j o ro rh€ hl'gh)

r H I Wryc hoichr (F]=2ajvEe anplrtodc)

i wavercnerhlhor;odaldisrncebeNeninyr*osuNc$i[wlcrcnt

Tw: trhve p.nod (rhe sm dkr$.c ^ {avd.ngrh rroig rhe !'ne dis) G.c rig.{{-b)

e vdociry (r /rw; vclociry d vhich rhe wve prcflcUiddgo* , n|lcb ]60ie3Ee yd ol phAe hsg.)

k : w!*rumbu(k=rrl,\ Gid.h))

o crrtu|fi \qvc rEqulncy (o=? z/T! (nd./s))

d vave !c!pns! (d =H/,I, nho o

q$cbcrkatlhenppslimilof H/,\=!|0 )

For pias velociq, cv, ir is in1libnad 1

rhe uverom movs *irh rhis ph,{ ycl€iq,

rihe wvdom 'novB ii rbc posniv x diEdronj rhe *st p6ilc (rhc shrp ol rhe ldd suftr) an

( = a c o s ( k r - @ t )

qavs (roucr d(rwin gru!tuy {!Er) s mpk

waw wtoctty (c,) a, = *51-1 ftn^l

ellaneous items rehtcd to wav€e

.d!ron!of ,h ur F(tdr.,R(Eff

F "

"t.t\,

p wrocily- 6- 5-4 -3 -2

cs =+cw

E @ s n p

" d , , " c , " $

-2) sillifi cad wave heigh (rlLt)

sigtrinsd *Nc bcidl js dc[ned s thc aEnge

h.ighr of rhe hishe$ oE rhid (Lj) ofsll*avc5 rc

ualy esiDardi Mve h.ighr signilis wlE rreisir

ish.dtrageren|ns$ndrniouchro$

r) N3tud nniigei'.hiis pcidls sd o@ud{wE pqiod

I

Fig,4-6 sar-u,-.h-!he|n'gs,Thesfucisrcqchly6tr

o88

VGM

T P = 0 5 [

Eicound wd tsdod trE) As shown h Fis.{-7 a shrp making vs (m's) i

ho{vlEsof rruep€ood,Tv(=0 3rtr) b'ah.,r,ridph6s{loclry.c\(= I 25fi)

ship sp*d pc,pcidicurf ro oc waE l

Lod is cxpnscd by rhc fdlrowing qudton:

+

f rtfnin8 b rh! rprib rcrirtomtlp

F i g , , l - 7 r - , - , , F r r , ,

it rt!

, i , , t

l2

E @ s h , p H - d ' r " s , " $ *

Itangerous Encounter with High Wave Group

cB=rD cw (sE Fslllt

croup vdejty n nqny.qual ro ri! $*d 6hp.n!nt

ol a ship h rhe vind dierioi, dai3.6us d.ouitr

*id hich *r sou! @q 'hi b i pl6on6d

wh.Eby'i.shiphrdct.Jby,sn.Bsioo|hjgh

u6 As m4riomd aboE, d' mainum !m hei$r

$Enl dagemN phenmem, kigr'bing Ih dsk or

Fi3,4-e shows rh? d?finition olcncounr.r rnsk

hc drnc@us zone ioi.i.ounbins r hisn vave group; ir x

s li d'c frs!(, &n E io ot ship lped v (knob) ro uvr

ps-Fis.4-c Dcinioid(rENbr4r! I

iod TG), vn, is sho*n as r

$ffiim orhish *,B core

ft.y win bins rh ship ro b.M,

*hi.h pob rdnw.d sbbiliry

cnon oflnrafl Slrhilir! cau\ed bl Ridingon $,,eCr6r al

r

-ir Loj'g*('idr rd ^ srrnr r a nd( orrcdrcd ni :

@ $ , p H , r , a , " $ " ,

Redudion or shbil'ty tnds ro be norc i'h i la'! flar (oib in{ shfs ad nshi,g rsdt md k$ siFincad i tuu-hun ships (bnkds and burk canieB)

fufunrc|3'.dd.bd.nd€hlorudby$aid*a€'

tu iim b or $ip! 'on mituid wirh rrrs waE cd (or rqh)

n.krm*ne 4hreno6 Enheil {cddng dan!.b6 h.ary reriis.)

tl!

laBqvave|olih.i'.hry(*i€hei.rpsiziig doc rd rdtrccd lrbiliry ship {sd should bc e\lu(d or cou6e red o' bofi, in ordq ro

pcnoJ whm cr{urii! d above prcduE' dE shoutd be

s bsn ca rhd fuy !l&e rhe d(k u.d( urr or 6u$ sF

Synchronous Rouing Motion

h.n rrE n,tunr muiig pedod (rr) dincidd vnh de en$!n

d lwc Fnod (TL) (riF1{) \lft4

o

a

o

" , " , _ _ : i " : r , :

-ns toigs(i( rhc $LP bcom( cndei )

sdiis rd sFchroios ro mtr b obrriid ustng rhe

-r @ s h , p H * d , , , g r , , $ , , ,

rEr\sc nabirity is rhc pmdd ohhc siipt leishr (w) ind rishrins kE (cz) (cz-cM {ii 3 )i i.e

igL,lc.dclkcledc4eiicludfad

s pir.h.d ftd doryn cM lncEds due ro rh inreae m eFer

.nr on the orher hind

M deu*s dE b a dccN i effediv wder phne widrtlilhelbendmc'bcsnclishlingmom

I

v.9|phHbdMd'3ighhdnqnrrEd

ptriod (rE) n rppmr ptriod of'hc ship (rr) (i rr = t/2 rR) rhe aren for 'his N

* throush uprish (6), sd mi sussive ouNd

e iear head ss whei ofuin{ shlps ad Pccs vm $bjcr b sp4d Edudioi arordi0lty

ior oily in ro[Niis sd qDdelrs sA @r a{, rc

,!.

l

E@

*'r""anur"'t"-Sud-ridiDg md Bmaching.to

rllietr a ship h snured on rhe

dirioN, me orbir,l v.lociry ot

di"e ri !trch I siturion (i.e

ship hEnins dM.srdF), No

is sisGd b m.on ,o ,n Jd!0n.,tsfiC.4J7 r!\ 'adai q

F l g 4 l 8 t u ! , o o h - h r u ,

" , ; , , " , ; " '

- hNn as brcach iigrd $d rhe ship n chrnge of hcadin!

n b c h m d * i d l , s n x r | m g | e 9 y ] 0 r 0 d ! ! b l | ] e r o r c' r d n d ] s n N l y o v e n i k e i b y ' n c { a v

S l r i p \ l o t i o D in H c r d r n d B o $ S ( r t

-l

wavelenqlh < ship Lensrh

F i ! 1 : \

wrverensrh > ship Lengrh

wruerensrh = ship Length

I r l : 5

Propell.r Rlcing iDd Reduction ofShip Spe€d

i.ausins n b ra( This grcd rid rbru

ld load rtsul\ in a sudden nsese in propdler reoturions, g.i.mins irros vihnrion Knosr B

bB, n d.Jn shoutd h

Fig 'l-27

.l

"l

F i s l 1 r

rh! ou qrsim ir lLbjlar b qc$N

E @ s h , p r ' * d h s h $ ^ ^

Shipping Water Forwdd

The npacr rorc of $ipping N{cr has No etrebr dird dynamic pEstrE cEded by rh shirFd

B.

shippins *rei Asdncd m ao adut shir ot(.oftspoidir3 ro B€.ufon $at r) Th! c!sidsshipspeeds.w$cmsubmglsmdnlioso|Mrleng'nbshipl.nglh'

i l c E a s s w h e n s h i e l c n e ' r l k d r u | b N [ tsrnppiig *fur nay 6 deErsd by rcdlcitrsFig.,i.:0 fr$.i., i

s.h wiln ib ovn anplltude, tensrh or rftqu.ncy fd dirce

Th iitbdion olrhe$ ompon.nc on lc.d b itresuhnq

Nedles ro sn il k impoilnr ro inw

rig.4-30

tl

rins wave lmp.cl

-6 f i s l : 1 , {