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PONAŠANJE BRODA NA TALASIMA____________________________Oblast dobrih i loših Lujsovih rebara(bez dokaza)Rešenja pokazuju da dodatna masa iprigušenje, osim od oblika rebra, zavise i odfrekvencije poniranja.Pri niskim frekvencijama nema prigušenja, adodatna masa poniranja beskonačno raste...Pri visokim frekvencijama (vibracijamarebra) prigušenje nestaje, a dodatna masateži konstantnoj vrednosti1m′ ⎯⎯⎯→ a ⎡( 1+ a ) 2+ 3a2 ⎣2 2ζρπω →∞o 1 3Ustvari, Lujs je “svoju” kompleksnutransformaciju uveo rešavajući problemvibracija broda, još 1929. godinedavno pre primene transformacije naljuljanje broda...Na problem poniranja i posrtanja su jeprvi primenili Porter 1960, Tasai 1961...⎤⎦PREDAVANJA 2009. 31
PONAŠANJE BRODA NA TALASIMA____________________________Zavisnost dodatne mase i prigušenja odfrekvencije oscilovanja stvara dodatni problem uproračunu poniranja i posrtanja broda na mirnojvodi...Sopstvene frekvencija zavise od dodatne d mase...?Neophodan je interativni postupak...U daleko važnijem problemu ljuljanja broda natalasima, ovakva teškoća (principijelno) nepostoji...Za ostala kretanja (valjanje, zanošenje, zakretanje)važim = m′ dx,n = n′dx∫ϕ ϕ ϕ ϕL∫m = m′ dx,n =n′dxL∫L∫η η η η∫2 2m = x m′ dx,n = x n′dxθ η θ ηLL∫Lkoja se takođe mogu dobiti istimpostupkom...odnosno Lujsovom transformacijomrešenja strujanja oko kružnog rebrakoje vrši prinudno valjanje, odnosnoprinudno zanošenje...Rešenja koja se dobijaju prikazanimpostupkom su izuzetnokomplikovana, i određuju seposebnim programima...(eventualno, dijagramima dobijenimna osnovu programa...)Ustvari, najsloženiji j deo kompjuterskihprograma iz Pomorstvenosti broda je bašodređivanje hidrodinamičkihkoeficijenata...Diplomski: Kuzmanović 2000PREDAVANJA 2009. 32
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