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PONAŠANJE BRODA NA TALASIMA____________________________Dijagrami prenosne funkcije valjanja veomasu slični odgovarajućim dijagramima izDinamike i Teorije oscilacija...Postoji, međutim, i jedna bitna razlika...razliku.Prigušenje i sopstvena frekvencija valjanjabroda, za razliku od klasičnih problemaoscilacija, zavise od frekvencije kretanja,odnosno menjaju se duž apcisa ovihdijagrama...To je posledica činjenice da dodatna masam φ i prigušenje n φ zavise od frekvencijekretanja...što je opet (fizički) posledica sistema talasakoji se indukuje samim valjanjem broda...Ovakva zavisnost hidrodinamičkihkoeficijenata od frekvencija ne utiče bitnona valjanje, jer su koeficijenti maliZa poniranje i zanošenje nabočnim talasima dobija seζG() t = ζG sin( ωTt−γζ)PζζoηG() t = ηG cos( ωTt−γη)G=oGoAToPηη=ATDaleko značajniji će biti uticaj na poniranje iposrtanje broda...PREDAVANJA 2009. 109
PONAŠANJE BRODA NA TALASIMA____________________________Pomernja, brzine i ubrzanja tačaka brodaKoristimoyCzCcos βC= sin βC= ϕ 1rrCCDobija sevC ≈ ηG − z η CϕvC ≈ ζG + y ζ CϕOdnosno integraljenjem i diferenciranjemv = v + vvGC G CGC= r ϕCr = y + z2 2C C C( )vC = ηG − r Cϕ sin βC + ϕ ≈ ηG −rCϕϕcos βC −rCϕsinβη C( )vC = ζG + r Cϕ cos βC + ϕ ≈ ζG − rCϕϕsin βC + r Cϕcosβζ Cη = η − z ϕC G Cζ = ζ + y ϕC G Ca≈ η −z ϕηC G Ca C≈ ζG + y ζ CϕZbir (razlika)harmonijskihfunkcija...PREDAVANJA 2009. 110
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