Frequency dependent mechanical properties of violin varnishes and their impact on vibro-mechanical tonewood properties

Violin varnishes influence the vibrational properties of tonewood. However, frequency dependence varnish and mechanical typical has received little attention. The viscoelastic various violin materials over audible range were characterized by dynamic analysis. studied showed comparable dependencies. For all varnishes, E increased tan(?) decreased with increasing frequency. results in good agreement an analytical model, which was used for additional numerical FEM calculations. approach numerically determining varnish-induced changes on basis individual wood confirmed through comparison experimental obtained earlier study. latter procedure subsequently to analyse eigenfrequencies a soundboard. revealed that determined specific tonewood, should be taken into account when assessing impact varnishes. • Viscoelastic characterization range. Properties strong most pronounced tan( ? ) frequencies ?< ?1000 ?Hz. calculations top plates expected shifts eigenfrequencies.