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PONAŠANJE BRODA NA TALASIMA____________________________Hidrodinamičku komponentupretpostavljamo u oblikuF′ =−n ζ −m ζζ ζ G ζGFizičko objašnjenje uvedenih parametaram ζ – dodatna masa broda pri poniranju.n ζ – prigušenje broda pri poniranjujeste dinamičkač a ζ = 0 , ζ = 0GG→jeste linearna...ali fizički smisao??F ′ = ζ0Odakle prigušenje, kadasmo zanemarili viskoznostvode?talasi...D ⋅ ζ = F −D⋅gGζD ⋅ ζG = ρgVo −ρgζGAVL −n ζζG −m ζζG−D ⋅g FF′( o)ζ( D + m ) ζζ G+ nζζ G+ ρgA VL ζ G= 0Prepoznajemo diferencijalnu jednačinuslobodnih prigušenih oscilacija...ζSređivanjem, sledi ζ + 2μ ζ + ω ζ = 02G ζ G ζ Gnζμζ=2D( 1+κ )ωζ=ζgAVLV ( 1+κ )oζκζ=mDζPREDAVANJA 2009. 11
PONAŠANJE BRODA NA TALASIMA____________________________Rešenje jednačine...−μ tζ () t = ζ eζsin( ω t−γ)Goζζωζ=α gδT1( + κ )ζΨ2μζ2ζ=ζ1− = 1 Ψ2 ζ−ζωζ ω ω ωζ=μωζζΨ
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