Modal Analysis of Violin Bodies with Back Plates Made of Different Wood Species

Vasile Ghiorghe Gliga, Mariana Domnica Stanciu, Silviu Marian Nastac, Mihaela Campean

Abstract


This research investigated the potential of some European wood species for use in the manufacturing of the back plates of violins as an alternative to the quite rare curly maple wood. An experimental modal analysis was employed for this purpose using the impact hammer method. The modal analysis was performed both on the top and back plates, as individual structures, and then after being integrated into the violin body. The modal analysis envisaged the determination of the eigenfrequencies (natural frequencies), the number of spectral components, and the quality factor, as important indicators of the acoustic performances of a musical instrument. A multi-criteria analysis based on the values obtained for these indicators allowed interesting findings concerning the acoustic properties of the selected wood species (hornbeam, willow, ash, bird-eye maple, walnut, and poplar). Same as curly maple, they all have special aesthetics, but only hornbeam, willow, and ash wood proved to have acoustic potential as well.

Keywords


Violin; Top plate; Back plate; Violin body; Modal analysis; Fundamental frequency; Number of spectral components; Quality factor

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