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Communication Dans Un Congrès Année : 2020

Numerical Models for Classical Guitars with Updated Parameters from Experimental Data

Pascal Ziegler
  • Fonction : Auteur
Peter Eberhard
  • Fonction : Auteur

Résumé

The classical guitar is a popular string instrument in which the sound results from a coupled mechanical process. The oscillation of the plucked strings is transferred through the bridge to the body which acts as an amplifier to radiate the sound of the guitar. In this contribution, a numerical model of a classical guitar is presented. Alongside the numerical modeling, experiments are carried out. The numerical model might be used as virtual prototype to simulate the influence of varying parameters like different bracing patterns or new geometries or to compare different guitars. The numerical finite element model of the guitar consists not only of the guitar body and the neck of the guitar, but also the influence of the air inside the guitar body is taken into account. Furthermore, the struts to reinforce the soundboard and the back of the guitar are included, and orthotropic material properties are considered. The numerical models are compared to experimental measurements and unknown parameters are estimated using experimental data in a model updating scheme. Experimentally, the vibration of the guitar is examined by means of an experimental modal analysis. An experimental setup being capable of determining eigenmodes and eigenfrequencies in a very high frequency resolution and spatial resolution is presented. For the measurements a scanning laser Doppler vibrometer is used and the guitars are excited via frequency sweeps using an electrodynamical shaker.
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Dates et versions

hal-03235385 , version 1 (27-05-2021)

Identifiants

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Alexander Brauchler, Pascal Ziegler, Peter Eberhard. Numerical Models for Classical Guitars with Updated Parameters from Experimental Data. Forum Acusticum, Dec 2020, Lyon, France. pp.2155-2161, ⟨10.48465/fa.2020.0072⟩. ⟨hal-03235385⟩

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