Procjena otpora poludeplasmanskih brodova sa zrcalnom krmom

Varda, Nenad and Degiuli, Nastia and Pedišić Buča, Marta (2012) Procjena otpora poludeplasmanskih brodova sa zrcalnom krmom. = Resistance prediction of semiplaning transom stern hulls. In: XX. simpozij Teorija i praksa brodogradnje, in memoriam prof. Leopold Sorta = The 20th symposium Theory and practice shipbuilding, in memoriam prof. Leopold Sorta, 27-29.09.2012., Zagreb; Croatia.

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RESISTANCE PREDICTION OF SEMIPLANING TRANSOM STERN hulls.pdf - Published Version Jezik dokumenta:English

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Abstract (Croatian)

Pouzdane metode predviđanja otpora tvore osnovni alat za preliminarni hidrodinamički projekt poludeplasmanskih brodova. Izračunati su ukupni otpori za pet modela serije poludeplasmanskih brodova sa zrcalnom krmom, razvijene u Brodarskom institutu u Zagrebu u okviru serije „Sklad“. Za prognozu ukupnog otpora za poludeplasmanske forme brodova korištene su metode Lahtiharju i Mercier-Savitsky. Obje metode su razvijene pomoću regresijske analize rezultata mjerenja ukupnog otpora modela brodova sa zrcalnom krmom. Ukupni otpori dobiveni navedenim metodama uspoređeni su s izmjerenim ukupnim otporom za široki raspon Froudeovih brojeva Fn 0,482 3,618. Mjerenja su provedena u bazenu B2 Brodarskog instituta u Zagrebu. Izmjeren ukupni otpor i ukupni otpor dobiven metodom Lahtiharju su uspoređeni za širi raspon Froudeovih brojeva od onog predloženog samom metodom. Ustanovljeno je da je metoda Lahtiharju pouzdanija od metode Mercier-Savitsky, koja može dati odstupanja i do 50%. Pored toga metoda Lahtiharju je primjenjiva za širi raspon Froudeovih brojeva od preporučenog.

Abstract

Reliable methods to predict resistance characteristics form the basic tool for the preliminary hydrodynamic design of semiplaning hulls. The total resistance is calculated for five models of semiplaning ships series „Sklad“ with transom stern developed at the Brodarski Institute in Zagreb. The Lahtiharju and Mercier-Savitsky methods for the total resistance prediction of semiplaning hulls were used. Both methods were developed by using regression analysis which was based on the total resistance data for the transom stern hull forms. The total resistance calculated with both methods is compared with measured total resistance for wide range of the Froude number Fn 0.482 3.618. Model tests were conducted in the towing tank B2 at the Brodarski Institute in Zagreb. Measured total resistance and total resistance obtained by the Lahtiharju method is compared for wider range of the Froude number than suggested by the author. It has been concluded that the Lahtiharju method is more reliable than the Mercier-Savitsky method which can give deviations up to 50%. Results pointed out the applicability of the Lahtiharju method for wider range of the Froude number than suggested.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: otpor; poluistisniska forma; zrcalna krma
Keywords (Croatian): resistance; semiplaning hull; transom stern
Subjects: TECHNICAL SCIENCE > Shipbuilding
Divisions: 600 Department of Naval Engineering and Marine Technology > 610 Chair of Hydromechanics of Marine Structures
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 14 May 2015 07:56
Last Modified: 29 Sep 2017 10:52
URI: http://repozitorij.fsb.hr/id/eprint/4135

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