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PONAŠANJE BRODA NA TALASIMA____________________________Za standardni ITTC spektar važi∫∞aσo= S( ω)dω=0 4bodnosno (za oba spektra)Proračunom se dalje dobijahσo=1621/3( o) ( b)T ≈ 0, 920T , T = 0, Tm≈1,296TVaži, neočekivano( b)⎛T⎞ε = 1− ⎜ = 1( o)⎟⎝T⎠2??Rejlijeva raspodela važi samo za (relativno)uske spektre...Dobija se zbog4σ = ω S( ω)dω→∞4Međutim, vrednosti spektra olujnih talasa asapri visokim frekvencijama, koje odgovarajumalim talasnim dužinama, potpuno sunezanimljive za brodogradnju...Zato se standardni spektar talasa koristisamo do frekvencija kod kojih amplitudatalasa postaje zanemarljivo mala, npr. doωmax≈ 3ωm2Tada je parametar širine spektra ε ≈ 035 ,Standardni ITTC spektar, u domenufrekvencija koje su interesantne za ljuljanjabroda, jeste relativno uzak, i za takve talase(približno) važi Rejlijev zakon raspodeleamplituda...∫0∞Mali, ali značajni problem...PREDAVANJA 2009. 75
PONAŠANJE BRODA NA TALASIMA____________________________Standardni ITTC spektri odnose se na otvorenomore (okeane) gde nema uticaja obala...Za mala mora i priobalne vode, uticaj blizine ioblika obale može biti veoma bitan...Zt Zato su, tokom tk godina, razvijani ilkli lokalni spektri ktiza mnoga svetska mora i priobalne plovne rute...Najpoznatiji od ovih spektara je spektarSevernog mora...tzv. JONSWAP spektar(Joint North Sea Wave Project)U nedostatku pouzdanijuh podataka...JONSWAP spektar se može koristiti iza druge priobalne vode...Postoji i spektar za Jadransko a more –Tabainov spektar...PrimerS = 0 658⋅3 3 S Bf ( ω )( ω) , , ( ω)f( ω)= e1 ⎛ ω ⎞− 122γ⎜−ω ⎟⎝ m ⎠γ = 007 , zaω ωS B (ω) – Bretšnajderov spektar2mmPREDAVANJA 2009. 76
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