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PONAŠANJE BRODA NA TALASIMA____________________________5.2.3. Dinamička opterećenjabroda na talasimaVeć je kod udarnog pritiska prislemingu pokazano da se na talasimajavljaju opterećenja kojih, pri plovidbibroda na mirnoj vodi, nema...Ustvari, sve sile koje deluju na brod, nabrodske uređeje i teret, menjaju se priljuljanju broda...Sile koje deluju na teret – klizanje i prevrtanjeteretaPretpostavimo da se, u proizvoljnoj tački napalubi broda koji se ljulja na talasima, nalaziteret mase m, čije težište C ima komponenteubrzanja a ξ , a η i a ζ ...U klasičnim, statičkim proračunimaopterećenja broda, dinamičke sile seuračunavaju preko određenih(iskustvenih) koeficijenata sigurnosti...Pokazaćemo da se, nakon što se odredeljuljanja broda, dinamička opterećenjabroda mogu i egzaknije proračunati...Važiodnosno ma = mg + F + FC N Tma ≈ F −Fϕηyma ≈ F − mg + F ϕζzzygde je iskorišćenocosϕ ≈ 1 sinϕ ≈ ϕPREDAVANJA 2009. 177
PONAŠANJE BRODA NA TALASIMA____________________________Dobija sez( ζ )( ηϕ )F = m a + gF = m a + gyPrimer sila koje deluju na kontejner visokonad palubom, na bočnim talasima...Poznato jea = a t−osin ( ωpγ )sin ( ωpγ )η η ηa = a t−ζ ζ ζoϕ = ϕocos( ω t p−γϕ)SlediF = mg+ ma t−zζsin ( ω )o pγζ( ω γ ) ϕ ( ω γ ) ( ω γ)F = ma sin t − + mg sin t − = F sin t −y η p η o p ϕ y p yooF′ = ma ζz o o2 2 2Fy = m⋅ aη + g ϕo + 2aη gϕosin( γϕ −γη)o o oPREDAVANJA 2009. 178
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