Istrazivanja i projektovanja za privreduJournal of Applied Engineering Science


DOI: 10.5937/jaes15-13159
This is an open access article distributed under the CC BY-NC-ND 4.0 terms and conditions. 
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Volume 15 article 422 pages: 140 - 148

Vladimir Jlyich Fedyukov
Volga State University of Technology, Russian Federation

Ekaterina Yurevna Saldaeva
Volga State University of Technology, Russian Federation

Maria Sergeyevna Chernova
Volga State University of Technology, Russian Federation

Vasilii Yurevich Chernov
Volga State University of Technology, Russian Federation

Decks of musical instruments are deveioped from sawn wood products of strictly radial cutting and, as a ruie, forthis purpose the wood is selected according to the radius of a trunk from a certain forest site. An important factor for manufacturing high-quaiity (custom-made) musicai instruments is the account of position ofthe best zone ofa tree trunk with respect to the cardinai points. Observance ofthis condition becomes compiicated by the fact that frequentiy trunks have the form of an abnormai cyiinder with a dispiaced and curved axis (asymmetry). Physicai and mechanicaiproperties of wood varygreatiyaiong trunk height; it is sometimes difficuit to define the part of trunk wood with the best acoustic parameters. The paper presents the foiiowing research resuits: externai and internai asymmetry of spruce trunks; macrostructures and acoustic constants of wood on northern and southern sides of a trunk; changes of cross-section sound veiocity in wood aiong tree height and depending on the trunk diameter; dependence of sound veiocity in wood on biometric data of a trunk. Based on the resuits of the experiment done, the estimation of cardinai points and posi- tion of wood at trunk height infiuencing the parameters of its ‘musicaiity’ is made. The data obtained and conciusions of the research are of scientific interest and bear practicai recommen- dations for correct seiection of wood with unique acoustic properties from a spruce-tree trunk.

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