Određivanje j faktora kod globalnih vertikalnih vibracija brodskog trupa

Galić, Helena (2015) Određivanje j faktora kod globalnih vertikalnih vibracija brodskog trupa. = Determination of j factor for global vertical hull-girder vibration. Master's thesis (Bologna) , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Parunov, Joško.

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Galić_2015_Diplomski rad.pdf Jezik dokumenta:Croatian

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Abstract (Croatian)

Dodatna hidrodinamička masa premašuje istisninu broda čak i do 60 %, te ima značajan utjecaj na iznos prirodnih frekvencija vibriranja trupa. U uvodnom dijelu razmatran je teorijski i numerički pristup računanju dodatne mase za vertikalne vibracije. Tradicionalna metoda za određivanje dodatne mase uključuje određivanje sekcijske dodatne mase za dvodimenzionalne poprečne presjeke uzduž broda te očitanje J redukcijskog fakora trodimenzionalnog strujanja iz Lewisovog dijagrama. Tradicionalni J faktori su određeni za pojednostavljene brodske forme. Dobivanje J faktora za suvremene brodske forme opisano je u analizi šest brodskih modela uključujući tankere, kontejnerske brodove, te jedan ratni brod. Nakon proračuna dodatne mase u programskom paketu Femap-Nastran slijedi teorijsko određivanje J faktora. Nakon analize rezultata prikazani su diskusija i zaključak.

Abstract

Added mass exceeds the displacement of the ship up to 60 %, and has a significant impact on the natural frequencies of hull girder vibration. The introductory part is dealing with theoretical and numerical approach to calculation of added mass for vertical vibration. Traditional method for calculating added mass includes determination of two-dimensional coefficient for cross- sectional segments along the ship, and determination of three-dimensional coefficient from Lewis diagram. Traditional J factors have been identified for simplified hull forms. Calculation of J factor for modern hull forms is described in the analysis of the six ships model including tankers, containers and one ware ship. After calculation of added mass, by using software package Femap-Nastran follows the theoretical determination of the J factor. After analysis of the results, discussion and conclusion are given.

Item Type: Thesis (Master's thesis (Bologna))
Uncontrolled Keywords: dodatna masa; vertikalne vibracije; J faktor; Lewisova metoda; Femap-Nastran
Keywords (Croatian): added mass; vertical vibration; J factor; Lewis metod; Femap-Nastran
Subjects: TECHNICAL SCIENCE > Shipbuilding > construction of vessels and offshore facilities
Divisions: 600 Department of Naval Engineering and Marine Technology > 620 Chair of Marine Structures Design
Date Deposited: 08 Dec 2015 15:05
Last Modified: 19 Jul 2016 10:51
URI: http://repozitorij.fsb.hr/id/eprint/4938

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