Abstract
The produced sound quality of guitar primarily depends on vibrational characteristics of the resonance box. Also, the tonal quality is influenced by the correct combination of tempo along with pitch, harmony, and melody in order to find music pleasurable. In this study, the resonance frequencies of the modelled resonance box have been analysed. The free-free modal analysis was performed in ABAQUS to obtain the modes shapes of the un-constrained sound box. To find music pleasing to the ear, the right pitch must be set, which is achieved by tuning the guitar strings. In order to analyse the sound elements, the Fourier analysis method was chosen and implemented in MATLAB. Identification of fundamentals and overtones of the individual string sounds were carried out prior and after tuning the string. The untuned strings showed irregular fundamental frequencies and higher partials of decay. Octaves and power spectrums have been presented and discussed in this paper.
Highlights
The musical instrument guitar is a system of complex vibrating elements
The finite-element and the modal analysis methods have been applied to the resonance box of a guitar with the purpose of analysing its vibrational behaviour
Fourier spectra approaches to time and frequency analysis is done
Summary
The musical instrument guitar is a system of complex vibrating elements. It is an assembly of several individual parts such as the body, sound hole, saddle, bridge, neck, headstock, tuning pegs and strings [1]. The sound energy is mainly produced by the sound box, called as resonance box, which is propagated. The sound box itself is made of sub parts like sound board (or top-plate), side-board, tail bock, transversal and longitudinal bars and bottom panel [1] [2]
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