Various studies in the past have dealt with the improvement of the acoustic properties of tonewoods. One promising approach has been the thermal modification of the raw material. In addition to this improvement in acoustic properties, the modification leads to reduced sorption of the wood, which increases the dimensional stability of the raw material and has a positive effect on the properties of musical instruments (Bucur, 2016). Comparable changes in wood structure occur as a result of the temperature effects of contact pyrolysis. This process has been used in the past for weathering protection of facades. The acoustic properties of tonewood are strongly dependent on the physical properties such as the bulk density, the dynamic modulus of elasticity and the damping of the material, which in turn are dependent on the moisture content of the material. The aim of this study is to answer the following question: How do the acoustic properties of thermally modified and contact pyrolyzed spruce wood behave at different climates compared to the same native baseline samples?
Keywords: thermal modification, contact pyrolysis, acoustic wood, modal analysis, damping properties at different relative humidities
Authors
János Kneifel
Eberswalde University for Sustainable Development, Germany
Christoph Munk
Eberswalde University for Sustainable Development, Germany
Alexander Pfriem
Eberswalde University for Sustainable Development, Germany
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