Abstract
Thirty-two guitars are measured geometrically and acoustically. The geometries of the top plate with its bracing as well as its thickness, the back plate with all bracing, the ribs, and rims are transferred to a CAD model. The top plate and the back plate of these guitars are measured using a 121-microphone array, back-propagating the sound field onto the top and back plates. Therefore, the guitars are once driven by impulses at the guitar bridge, once by plucking all notes on all strings up to the 12th fret to reconstruct the forced-oscillation patterns. Large differences are found with respect to the basic modes between the different guitars in terms of frequency and shape of their eigenmodes. Comparing the measured and calculated eigenvalues with the forced-oscillation modes driven by the strings, it appears that the eigenmode shapes often differ from the forced-oscillation patterns considerably.
Published Version
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