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Understanding soundboard vibration modes in asymmetrical braced guitars
Juan F. Fernandez
Laboratoire ESE, Université Paris 11
The modern classical guitar inherits most of its characteristics from the symmetric guitar design of A. Torres in the late XIX century. However, controversy exists, and many famous guitar makers use asymmetrical bracing patterns on the soundboard to "enhance bass and treble note production". We used non-linear analyses using Abaqus-Standard student Edition to evaluate natural vibration modes in simulated symmetrical an asymmetrical guitar soundboards. Results indicate that asymmetric designs do improve sound production over symmetrical designs as asymmetry increases the participation factor on the vertical axis of the soundboard (PF3). Boundary conditions and geometry had overall more impact on mode shapes than strutting itself.
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