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PONAŠANJE BRODA NA TALASIMA____________________________v 2 N(= σrel )lnmax 2N = 3600⋅ f ⋅t oPrimer malog kontejnerskog brodah 1/3 = 5,5 mfV V= =T 2πσσ( rel)o( rel)2t o vreme trajanja oluje (npr. 2 časa)Najverovatniji maksimalnidinamički pritisak na dno brodapri slemingu, tokom t o časovatrajanja oluje, jep= 1cv2 ρ2max s maxPREDAVANJA 2009. 165
PONAŠANJE BRODA NA TALASIMA____________________________5.2.2. Dodatni otpor i spontanosmanjenje brzine na talasimaPri plovidbi po mirnoj vodi, na brod delujudve sile u pravcu kretanja: potisak propelerau smeru brzine, i otpor broda nasuprotbrzini plovidbe...Ukoliko je brzina plovidbe konstantna, ovedve sile su jednakog intenziteta i nalaze se udinamičkoj ravnoteži...Posmatraćemo sada odgovarajuće sile priplovidbi broda konstantnom brzinom v opramcem ka talasima...Poniranje i posrtanje broda na talasima suprigušena oscilatorna kretanja, odnosnokretanja tokom kojih se gubi energija...Fizički, ički energija se troši na sistem talasakoje brod stvara svojim ljuljanjem...Posledica je manja brzina plovidbe, ili većiotpor broda pri nepromenjenoj brzini...Da bi brzina plovodbe na talasima ostalanepromenjena – jednaka brzini na mirnojvodi, neophodno je da energiju koja se gubitokom ljuljanja nadoknadi brodskipogonski motor.On mora, preko propelera, stvarati većusilu potiska, i njome savladati dodatni otporbroda na talasima...Preciznije, ako pretpostavimo p da brodplovi konstantnom brzinom v o pramcemka talasima (pretpostavimo da nemazaletanja) ukupni otpor broda će bitipromenljiv, R = R(t) .Ukoliko su talasi regularni, ova promenaotpora je oscilatorna, ,prividnomfrekvencijom talasa ω p ...a srednja vrednost otpora tokom jednogciklusa ljuljanja (tokom perioda T p )iznosiPREDAVANJA 2009. 166
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