zaključna naloga Univerzitetnega študijskega programa I. stopnje Strojništvo - Razvojno raziskovalni program
Miha Gradišnik (Author), Gregor Čepon (Mentor)

Abstract

Modalna analiza je orodje za razumevanje dinamskih lastnosti sistema, kot so lastne frekvence, lastne oblike in dušenje. Pomembna je predvsem iz vidika delovanja izdelkov, saj želimo, da ti delujejo karseda mirno. To dosežemo z izogibanjem obratovanja v območju lastnih frekvenc in ravno zato jih je pomembno poznati, saj le na takšen način lahko sistem ustrezno optimiziramo. Dinamski strukturni odziv je neposredno povezan z zvokom, kar je pri instrumentih še bolj pomembno. V okviru zaključne naloge smo se lotili preučevanja dinamskega odziva činele. Z lastno kodo v Mathematici smo numerično določili dinamski odziv ravne plošče (kvadratne in okrogle), rezultate pa primerjali s tistimi v komercialnem programu Ansys. Za natančnejše modeliranje činele je bilo potrebno upoštevati izbočenost činele, zato smo morali upoštevati drug tip končnih elementov - lupine. Ravno to je bil razlog, da smo modalno analizo realnega modela izvedli le v komercialnem programu Ansys, rezultate pa smo primerjali z eksperimentalnimi, kjer se je izkazalo dobro ujemanje.

Keywords

diplomske naloge;modalne analize;metoda končnih elementov;plošče;činele;eksperimenti;računalniški program Mathematica;računalniški program Ansys;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [M. Gradišnik]
UDC: 534:519.61:62-415(043.2)
COBISS: 82851843 Link will open in a new window
Views: 312
Downloads: 48
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Other data

Secondary language: English
Secondary title: Numerical and experimental modal analysis of a plate
Secondary abstract: Modal analysis is a tool for understaing dynamic properties of a system, such as natural frequencies, mode shapes and damping. Above all, it is important in the terms of functioning of products, because it is usually desired for them to operate as calmy as possible. We can achieve this by steering their operation away from the natural frequencies and that is why it is important to know them, because only in this way we can optimize the system. Dynamic strucutral response is directly connected with sound, which is even more important in the terms of instruments. As a part of the graduation thesis we undertook the study of a dynamic response of a cymbal. Using our own code in Mathematica, we numerically determined the dynamic response of a flat plate (square and round) and compared the results with those in the commercial program Ansys. For more accurate modeling of the cymbal, it was necessary to take into account the convexity of the cymbal, so we had to consider another type of finite elements - shells. This was the reason why we performed the modal analysis of the real model only in the commercial program Ansys and compared the results with the experimental ones, where a good match was shown.
Secondary keywords: thesis;modal analysis;finite element method;plates;cymbals;experiments;Mathematica software;Ansys software;
Type (COBISS): Final paper
Study programme: 0
Embargo end date (OpenAIRE): 1970-01-01
Thesis comment: Univ. v Ljubljani, Fak. za strojništvo
Pages: XIII, 34 f.
ID: 13289153
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