Classical guitar top board design by finite element method modal analysis based on acoustic measurements of guitars of different quality

摘要

Only good-quality wood of the Picea genus is used to make the top plates and soundboards of wooden musical instruments. It is becoming increasingly difficult to obtain such wood because of limited environmental resources. In addition, wood quality varies widely as wood is a biomaterial, and the tone of wooden musical instruments is strongly dependent on humidity. To resolve these issues,owe have developed a composite of polyurethane foam reinforced anisotropically with carbon fibers for use as musical instrument soundboards [1,2] Experimental folk guitars were built by a musical instrument maker using top boards of this composite, and the results of auditory appraisal by guitar experts indicated that it had sufficient potential for use as a substitute material for soundboard construction [3] Furthermore, in our previous study [4], the effects of the physical properties of folk guitar top boards were investigated by FEM (finite element method) modal analysis, and the results showed that the relationship between frequency and mode number could be freely controlled by adjusting those properties.