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PONAŠANJE BRODA NA TALASIMA____________________________Da rezimiramo...Najnepovoljnija oblast valjanja broda na regularnim talasima je kritična oblast (oblastrezonancije) koju, kad god je to moguće, treba izbeći...Brod treba da bude što dalje od rezonancije, bilo u potkritičnoj, bilo u natkritičnoj oblastivaljanja... Šta je bolje?..Ovakvo “podešavanje” oblasti valjanja je (delimično) pod kontrolom projektanta i (ili)zapovednika broda...Oni mogu uticati na sopstveni period valjanja preko metacentarske visine broda...Videće se da zapovednik broda ima i dodatni efikasan način da izbegne rezonanciju –prmenom pravca kretanja broda...I projektant broda ima dodatnu mogučnost da smanji negativan uticaj rezonancijepovećanjem prigušenja, odnosno pogodnim izborom forme i (mnogo efikasnije)ugradnjom tzv. stabilizatora valjanja...Ni projektant, niti zapovednik broda, međutim, ne mogu uticati na same talasa, pogotovošto u realnim uslovima na slobodnoj površini postoji veliki broj talasa različitih perioda...Zato ova analiza ostaje nepotpuna...i biće dopunjena i zaokružena tek u poglavlju o valjanju broda na neregularnim talasima...Analogija, lenjivac, štreber, entuzijasta...PREDAVANJA 2009. 107
PONAŠANJE BRODA NA TALASIMA____________________________Do sada smo analizirali samougao valjanja (nagiba broda)φ(t)...Sada ćemo odrediti i ugaonubrzinu i ugaono ubrzanje brodapri valjanjuj ϕ() t =−ϕoωT sin( ωTt−γϕ)2 ϕ() t =−ϕoωT cos( ωTt−γϕ)Mogu se definisati i prenosnefunkcije ugaone brzine i ugaonogubrzanjaω T = ω φP ϕ2= ϕωo TϕωωoT ϕΛϕωTωTPϕα= oα= = =oω ω μ ω Λ Ψ Λ( T) T( )2 22 2 2 2 2 2 2ϕ− + 4 ϕ1− ϕ+ 4ϕ ϕP ϕ22 2 2= ϕωo T 2 ϕωωo 2T ϕΛϕωTωTPϕα= oα= = =oω ω μ ω Λ Ψ Λ( T ) T ( )2 22 2 2 2 2 2 2ϕ− + 4ϕ1− ϕ+ 4ϕ ϕ.PREDAVANJA 2009. 108
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