Akustične lastnosti ukulel

Šunta, Gregor (author), Merhar, Miran (mentor)

V nalogi smo izdelali računalniški model že izdelane kupljene ukulele, in naredili eksperimentalno modalno analizo. V Solidwoksu smo izdelali model inštrumenta na podlagi izmerjenih dimenzij sestavljene ukulele. Narejeni model smo prenesli v Ansys, kjer smo s pomočjo metode končnih elementov naredili modalno analizo inštrumenta. Ker nismo poznali mehanskih lastnosti lesa, iz katerega je bila ukulela izdelana, smo modelu določili začetne lastnosti. Hkrati smo na ukuleli naredili eksperimentalno modalno analizo, kjer smo izmerili lastne frekvence zgornje in spodnje plošče. V nadaljevanju smo prilagajali mehanske lastnosti materiala računalniškega modela, dokler nismo dosegli zadovoljivega ujemanja izračunanih lastnih frekvenc z izmerjenimi. Iz narejenega modela smo ugotovili, da lahko kljub nenatančnemu poznavanju mehanskih lastnosti lesa, iz katerega je ukulela izdelana, naredimo njen model z ustrezno natančnostjo.

• Language: Slovenian
• Keywords: ukulela, lastna frekvenca, modalna analiza, metoda končnih elementov
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: BF - Biotechnical Faculty
• Publisher: [G. Šunta]
• Year: 2020
• PID: 20.500.12556/RUL-120446
• UDC: 630*812.12
• COBISS.SI-ID: 29053699
• Publication date in RUL: 20.09.2020

ŠUNTA, Gregor, 2020, Akustične lastnosti ukulel [online]. Bachelor’s thesis. G. Šunta. [Accessed 18 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=120446

Secondary language

• Language: English
• Title: Acoustic properties of ukuleles

Abstract

For this thesis, an exact 3D computer-aided model of a bought and already-built ukulele has been constructed, and an experimental modal analysis was then performed on this. The geometry, based on the measured dimensions, was made in SolidWorks. The defined geometry was imported into Ansys, where a modal analysis, based on the finite element method, was executed. The mechanical properties of the wood used to build the ukulele were unknown, and therefore for the initial calculations mechanical properties found in literature were used. An experimental modal analysis of the ukulele was also performed, where the eigenfrequencies of the upper and lower plates were measured. Afterwards the mechanical properties were adjusted to the point where the calculated eigenfrequencies were comparable to the measured ones. It was concluded, based on the built model, that even without knowing the exact mechanical properties of the wood used to build the ukulele a model with the proper accuracy can be made.

• Keywords: ukulele, natural frequency, modal analysis, finite element method