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. In this contribution, a procedure to create a numerical finite element (FE) model of a classical guitar with the help of experimental data is presented. The geometry of the guitar is reverse-engineered from computed tomography scans to a very high level of detail, and care is taken in including all necessary physical influences. All of the five different types of wood used in the guitar are modeled with their corresponding orthotropic material characteristics, and the fluid-structure interaction between the guitar body and the enclosed air is taken into account by discretizing the air volume inside the guitar with FEs in addition to the discretization of the structural parts. Besides the numerical model, an experimental setup is proposed to identify the modal parameters of a guitar. The procedure concludes with determining reasonable material properties for the numerical model using experimental data. The quality of the resulting model is demonstrated by comparing the numerically calculated and experimentally identified modal parameters.
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June 2021
June 24 2021
An entirely reverse-engineered finite element model of a classical guitar in comparison with experimental dataa)
Special Collection:
Modeling of Musical Instruments
Alexander Brauchler
;
Alexander Brauchler
b)
Institute of Engineering and Computational Mechanics, University of Stuttgart
, Pfaffenwaldring 9, Stuttgart, 70569, Germany
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Pascal Ziegler;
Pascal Ziegler
Institute of Engineering and Computational Mechanics, University of Stuttgart
, Pfaffenwaldring 9, Stuttgart, 70569, Germany
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Peter Eberhard
Peter Eberhard
c)
Institute of Engineering and Computational Mechanics, University of Stuttgart
, Pfaffenwaldring 9, Stuttgart, 70569, Germany
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a)
This paper is part of a special issue on Modeling of Musical Instruments.
b)
Electronic mail: [email protected], ORCID: 0000-0002-2359-4206.
c)
ORCID: 0000-0003-1809-4407.
J. Acoust. Soc. Am. 149, 4450–4462 (2021)
Article history
Received:
January 28 2021
Accepted:
May 27 2021
Citation
Alexander Brauchler, Pascal Ziegler, Peter Eberhard; An entirely reverse-engineered finite element model of a classical guitar in comparison with experimental data. J. Acoust. Soc. Am. 1 June 2021; 149 (6): 4450–4462. https://doi.org/10.1121/10.0005310
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