Split Guitar - Vibration calculation - Cast3M

The idea of Split Guitar emerged in 2009 during the Master's thesis of M. Kurijn Buys which was supervised by Charles Besnainou and Joel Frelat (Jean Le Rond d'Alembert Institute, team MISES). The idea was initially splitting the soundboard of a harp in order to increase the modal density and the number of radiating mode. An application to the guitar was then thought, the soundboard is then split from the rose to the bottom and the only bridge connects the two parties of the soundboard. A patent has been filed and the first experimental results were presented at ISMA (International Symposium on Music Acoustics) in Sydney in 2010. The tests have presented an increase in sound level of 2.87 dB all over the frequency range of the guitar.

This project was to design a digital model to highlight the vibration gain produced by splitting the soundboard. It was conducted jointly with Felix LARRIEU. We have, after validating the finite element method under Cast3M, seek to highlight a possible vibration gain without trying to calculate the induced radiation.

The comparison between split and unsplit guitars was based ​​on the number of radiating assumed modes (thanks to their mode shape) and the frequency responses of both types. Two results have especially emerged, namely a frequency response flatter with the Split Guitar and a radiating assumed modes density upper. To complement the work of the project it was continued by Arthur Givois the following semester.