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PONAŠANJE BRODA NA TALASIMA____________________________Za kraj, tri tipična numerička primeraBrzinavetra(kn)Značajnavisinatalasa(m)Stanjemora(WMO)Jačinavetra(°Bf)Maks.period(s)Modalnipriod(s)Maks.dužinatalasa(m)Modalnadužinatalasa(m)Verovatnoćapojavljivanja,svetski prosek(%)20 3,1 5 5 13,4 8,79 318 120 2030 5,1 6 7 18,5 11,6 533 200 560 14,6 9 11 30,6 19,5 1467 567 0,001PREDAVANJA 2009. 85
PONAŠANJE BRODA NA TALASIMA____________________________4. LJULJANJE BRODA NA REGULARNIM TALASIMALjuljanja broda na mirnoj vodi predstavljaju (jezikom Mehanike) slobodne prigušeneoscilacije tela oko svog ravnotežnog položaja...Poremećaj pritiska koji izaziva regularni talas je harmonijska funkcija koja imafrekvenciju talasa...a brod ove oscilacije pritiska oseća prividnom frekvencijom talasa ω p ...Τreba očekivati da ljuljanja broda na regularnim talasima predstavljaju prinudne prigušeneoscilacije, ij kod kojih je poremećajna ć sila (prinuda) )harmonijska funkcija frekvencije ω p ...Diferencijalna jednačina ovakvog kretanja glaseAZ+ 2 μ Z+ ω Z + = ω t+δ... sin ( )2 ZZ Z p ZD+mZA Z , δ Z – nepoznata amplituda i fazni pomeraj pobudne sile (momenta)...Javljaju se dve frekvencije, ω Z , ω p ...PREDAVANJA 2009. 86
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