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PONAŠANJE BRODA NA TALASIMA____________________________4.7. Dodatni problemi valjanja broda4.7.1. Prigušenje pri valjanjuNezavisna a jednačina avaja valjanja jaboda broda nabočnim regularnim talasima glasi( Jx+ m ) ϕϕ+ Mr( ϕ) + gD ⋅MG ⋅ ϕ = gD ⋅MG ⋅αo cosωTtpotM ( ϕ ) = M + Mvisr r rvis lam ( n)= M = n ϕ+ n ϕ⋅ ϕ + ...pot potMrn ϕϕrϕϕprigušenje nije linearno...J m n n n gD MG gD MG tpot lam ( n)(x+ϕ) ϕ+ (ϕ+ϕ) ϕ+ ϕϕ⋅ ϕ + ⋅ ⋅ ϕ = ⋅ ⋅αocosωTSvodimo naJ m n gD MG gD MG t( e)(x+ϕ) ϕ+ ϕϕ+ ⋅ ⋅ ϕ = ⋅ ⋅αocosωTI određujemo ekvivalentno linearno prigušenje ( e)n ϕ= ??PREDAVANJA 2009. 135
PONAŠANJE BRODA NA TALASIMA____________________________Određivanje nelinearnog prigušenja privaljanju je veoma komplikovano, i jošuvek nije rešeno s dovoljnomtačnošću...Čisto teorijskim putem – za sadanemoguće...Semi – empirijske formule, uglavnomnedovoljno tačne i nepouzdane...Problem je čak i eksperimentalnoodređivanje(razmera)...To je, najverovatnije, najslabijakarika u proračunima ponašanja natalasima...Rečeno je već da prigušenje zavisi iod frekvencije valjanja...Najvažnije je, međutim, prigušenje prirezonanciji...Tipično...tako da nije neophodno određivati prigušenjeza sve frekvencije...Eksperimenti:slobodno, prigušeno valjanje...ili prinudno rezonantno valjanje...PREDAVANJA 2009. 136
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