Procjena otpora glisera u mirnoj vodi

Čižmek, Zrinka and Degiuli, Nastia (2012) Procjena otpora glisera u mirnoj vodi. = Evaluation of resistance of planing hulls in smooth water. 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.

[img]
Preview
Text
EVALUATION OF RESISTANCE OF PLANING HULLS IN SMOOTH water.pdf - Published Version Jezik dokumenta:English

Download (440kB) | Preview
Official URL: http://www.hrbi.hr/sorta2012/#

Abstract (Croatian)

Cilj ovog rada je procjena ukupnog otpora glisera s prizmatičnom formom trupa. Razvijen je programski kod za procjenu ukupnog otpora ova dva režima plovidbe koji omogućava projektantu brzu prognozu ukupnog otpora u fazi pretprojekta. Korištena je metoda Savitsky za procjenu otpora za predglisirajuće i glisirajuće područje i metoda Savitsky-Brown za predglisirajuće područje plovidbe. Kod je testiran na modelima Serije 62 za koju postoje mjerenja provedena u bazenu Brodarskog instituta u Zagrebu. Ukupni otpor dobiven programskim kodom usporeñen je s rezultatima mjerenja ukupnog otpora. Iz dobivenih rezultata vidljivo je da metoda Savitsky nije pogodna za proračun otpora u području niskih vrijednosti Froudeovog broja na temelju istisnine 1 FnÑ 2 £ £ , jer odstupanje u rezultatima može iznositi do 45%, dok za područje većih vrijednosti Froudeovog broja Fn 2 Ñ > daje zadovoljavajuće slaganje s izmjerenim vrijednostima uz maksimalno odstupanje do 20%. Za područje niskih vrijednosti Froudeovog broja preporuča se primjena metode Savitsky-Brown kod koje su odstupanja do 10%.

Abstract

The aim of this paper is evaluation of the total resistance of planing forms with prismatic hull. Computer code has been developed to estimate the total resistance in the planing and preplaning range, which allows the designer to predict the total resistance in the preliminary design phase. Savitsky method is used to evaluate the total resistance in the preplaning and planing speed range, and Savitsky-Brown method for preplaning speed range. Code is tested on Series 62 models because of available experimental data from towing tank tests conducted at the Brodarski Institute in Zagreb. The total resistance obtained by the program code is compared with the measurements of the total resistance. From the obtained results it is evident that the Savitsky method is not suitable for resistance evaluation in the range of the volume Froude number 1 FnÑ 2 £ £ because the deviations in results may be up to 45%, while for the higher Froude number range Fn 2 Ñ > gives satisfactory agreement with the measured values with a maximum deviation of up to 20 %. For the low values of the volume Froude number the application of Savitsky-Brown method is recommended, which gives deviations of up to 10%.

Item Type: Conference or Workshop Item (Lecture)
Uncontrolled Keywords: otpor; glisiranje; predglisiranje
Keywords (Croatian): resistance; planing; preplaning
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 07:50
Last Modified: 29 Sep 2017 10:56
URI: http://repozitorij.fsb.hr/id/eprint/4134

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year

Nema podataka za dohvacanje citata