Modeling the Body of a Classical Guitar Using the Finite Element Method and Experimental Modal Analysis
* Presenting author
Abstract:
The classical guitar is not only fascinating musicians and audiences worldwide but also scientists are interested in the interplay of the coupled oscillatory systems that make up the instrument.A numerical finite element model of a classical guitar body enhanced by experimental data is presented in this contribution.The very detailed model includes all necessary physical influences, and the guitar's geometry is reverse-engineered from computed tomography scans.Five different wooden materials used in the guitar are modeled with their corresponding orthotropic material properties.Furthermore, the fluid-structure interaction between the guitar body and the enclosed air volume is taken into account in the coupled finite element model.Moreover, a setup for an experimental modal analysis employing a scanning laser Doppler vibrometer is proposed, and modal parameters are identified utilizing the complex mode indicator function and enhanced frequency response functions. Finally, the experimentally identified modal parameters are used to improve the numerical model via a model updating procedure in which the properties of the wooden materials are identified.The results substantiate the numerical model and, in addition, enhance the knowledge about the instrument by delivering the beforehand only coarsely known material properties.