diplomsko delo
Tomaž Zupančič (Author), Aleš Straže (Reviewer), Miran Merhar (Mentor)

Abstract

V nalogi smo naredili dinamično analizo že izdelane kitare. Z eksperimentalno modalno analizo smo izmerili njene lastne frekvence, vrednosti pa smo primerjali z rezultati modalne analize, narejene s pomočjo metode končnih elementov s programom Ansys. Ujemanje frekvenc je bilo zelo dobro, še zlasti ker nismo natančno poznali mehanskih lastnosti lesa, iz katerega je bila kitara izdelana. Poleg analizirane kitare smo dodatno še trem kitaram izmerili njihov odziv na vzbujanje strune A(110 Hz), kjer smo struno konstantno vzbujali s posebej narejenim vzbujevalnikom. Izmerili smo vzbujevalne sile strune v vseh treh smereh, s katerimi struna deluje preko mostička na trup kitare. Primerjava spektra vzbujanja in odziva kitar je pokazala, da različne kitare različno intenzivno zadušijo višje harmonske frekvence, kar vpliva na kakovost zvoka kitare.

Keywords

akustična kitara;metoda končnih elementov;modalna analiza;Ansys;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL BF - Biotechnical Faculty
Publisher: [T. Zupančič]
UDC: 630*812.12
COBISS: 3113353 Link will open in a new window
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Other data

Secondary language: English
Secondary title: Dynamic analysis of the guitar soundboard using the finite element method
Secondary abstract: In the thesis a dynamic analysis of an already built guitar was done. Using experimental modal analysis its natural frequencies were measured, and the values were compared to the results of modal analysis using the finite element method made with Ansys software. The correlation between measured and calculated values was very good, since the mechanical properties of the wood from which the guitar was made were not exactly known. Besides the analysed guitar, three additional guitars were taken and their responses to the excitation of string A (110 Hz) were measured where the string was excited always in the same way with a specially designed exciter. The excitation forces of the string in all three directions were also measured, by which the string excite the guitar body through the bridge. Comparison of the excitation and response spectra of guitars showed that different guitars differently dampen higher harmonic frequencies, which affects the sound quality of the guitar.
Secondary keywords: acoustic guitar;finite element method;modal analysis;Ansys;
Type (COBISS): Bachelor thesis/paper
Study programme: 0
Thesis comment: Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages: IX, 75 f.
ID: 11227609
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