Utjecaj krutosti konstrukcijskih komponenata na raspodjelu naprezanja u ispušnom kućištu plinske turbine

Višak, Tomica (2015) Utjecaj krutosti konstrukcijskih komponenata na raspodjelu naprezanja u ispušnom kućištu plinske turbine. = Influence of structural components stiffness on stress distribution in gas turbine exhaust housing. Undergraduate thesis , Sveučilište u Zagrebu, Fakultet strojarstva i brodogradnje, UNSPECIFIED. Mentor: Tonković, Zdenko.

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Abstract (Croatian)

U radu je provedena analiza utjecaja debljine stjenke na krutost konstrukcijskih komponenata ispušnog kućišta plinske turbine. Analiza je provedena numerički pomoću programskog paketa ABAQUS. Kućište je diskretizirano pomoću kvadratnih elemenata za analizu ljusaka. Konvergencija elemenata je ispitana na jednostavnom primjeru kvadratne ploče opterećene na vlak kontinuiranim opterećenjem uzduž suprotnih rubova, ploče opterećene na savijanje koncentriranom silom koja djeluje na sredini ploče i na samom modelu kako bi se dobila potreban gustoća elemenata. Zbog simetrije modela, ispitivana je samo jedna desetina ljuske. Konstrukcija je opterećena pomacima koji su dobiveni mjerenjem. Opterećenje na vanjskoj ljusci je primijenjeno na maloj površini i na kratkom dijelu izvodnice ljuske. Unutarnja ljuska je opterećena pomakom po uskom pojasu. Prvo su se računala naprezanja i pomaci u ljusci na kojoj su provedena mjerenja, a nakon toga se varirala debljina stjenke. Debljina stjenke se varirala na način da se debljina stjenke postepeno smanjuje u dijelovima konstrukcije u kojima vladaju manji pomaci i naprezanja, a povećava u dijelovima konstrukcije u kojima vladaju veći pomaci i naprezanja. Ovaj postupak je proveden za dvije varijante debljine komponenti konstrukcije.

Abstract

In this paper the influence of the shell thickness on the stiffness of the gas turbine exhaust housing has been analyzed. The analysis was conducted using the numerical software package ABAQUS. Housing is discretized using square elements for shell analysis. The convergence of these elements was testet on simple example of streching the square plate with continous load along the opposite edges, plate bending by concentrated force acting on the center of the plate and on the model in order to obtain required density of the elements. Because of the symmetry in model, only one-tenth of the shell was tested. The structure is loaded with measured displacements. The load on the outer shell was applied on a small area. Applied load on the inner shell was in form of displacements on narrow band. Firstly, stress and displacements were analyzed on the shell on which the measurements have been made, and then the thickness of the shell has been varied in a way that the shell thickness would be gradually decreased in the parts of the structures with lower stress and strain values and increased in parts with higher stress and strain values. This procedure was carried out in two variants of thickness structural components.

Item Type: Thesis (Undergraduate thesis)
Uncontrolled Keywords: ispušno kućište plinske turbine; debljina ljuske; metoda konačnih elemenata; ABAQUS
Keywords (Croatian): gas turbine exhaust housing; shell thickness; finite element method; ABAQUS
Subjects: TECHNICAL SCIENCE > Mechanical Engineering
Divisions: 200 Department of Engineering Mechanics > 210 Chair of Mechanics and Strength of Materials
Date Deposited: 04 Mar 2015 09:14
Last Modified: 10 Apr 2020 16:12
URI: http://repozitorij.fsb.hr/id/eprint/3319

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