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PONAŠANJE BRODA NA TALASIMA____________________________Ustvari, prema prethodnim pretpostavkama, važiDδ = = constρLBTtako da se povećava samo koeficijent punoće vodnelinije α ...Popunjavanje vodne linije dovodi do promeneforme rebara...Da li je ovakva promena formepovoljna?Posmatrajmo prigušenje...nρ g2′B=nR3ωp=ωpωp2g⎛ B ⎞Rn = f ⎜ωp, , βR⎟⎝ TR⎠Širina rebara u pramčanom i krmenom delu brodase povećava, što, pri nepromenjenom gazu, dovodido većih odnosa B R /TR .S obzirom na uslov D = const, površine rebara sene menjaju, što, pri povećanoj širini, dovodi dosmanjenja koeficijenta punoće rebra β R ...Rebra pri tom dobijaju karakterističan “V” oblik...β ,n′RB / T ,n′ RRPREDAVANJA 2009. 213
PONAŠANJE BRODA NA TALASIMA____________________________Fizički, novi V oblik rebara indukuju većetalase pri poniranju, koji odnose većuenergiju...Mera, koju smo uveli na osnovu formule zabezdimenzione periode, pokazala se veomapovoljna i sa stanovišta prigušenja!Dodatno, i veoma povoljno...novi oblik pramčanih rebara ima većipoprečni ugao nagiba (fler) θ p , što bitnosmanjuje udarne pritiske na dnu broda,ukoliko i dođe do sleminga.Popunjavanjem vodne linije na pramcu ikrmi, raste radijus inercije vodne linije...T gy δTψ = Tψ = 2π( 1++κψ)L i Lαšto, uz nepromenjeni radijus inercije j y ,dodatno smanjuje sopstveni period posrtanjabroda.Razmotrimo sada uticaj popunjavanja j vodnelinije na sleming.Zbog manjeg poniranja i posrtanja, prinepromenjenom gazu broda, opasnost odsleminga se smanjuje...j yyPREDAVANJA 2009. 214
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