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Volume 15 article 422 pages: 140 - 148
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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