Background and Purpose: Nowadays selection of resonant raw material in forests is not practically carried out; there are no standards and samples for a tree with such timber, and, consequently, ...rational target use of this unique natural material is not achieved. Thereof a lot of valuable wood remains in forests or is harvested for utilizing as general-purpose forest products or firewood. The research is focused on the studies of interrelation of resonant properties of wood and its biomorphological attributes such as crown diameter and height, trunk habitus, branchless zone extension, etc.
Materials and Methods: Test material for the research of dendroacoustic parameters were cross-section radial cores 4.0 mm in diameter selected with an increment borer at breath height from 16 model trees after cutting them down. Simultaneously, diameters of trunks at relative heights (H) of 0.2Н, 0.5Н and 0.7Н, as well as branchless zone extension and tree crown parameters (its extension, first alive knot fastening height, etc.) were defined. Then, the interrelation was revealed between the biometric data of a tree trunk and average sound velocity measured across the trunk with UK-14П ultrasonic device at different relative heights.
Results: The results submitted in this paper present practical value and assess the accuracy of standing spruce wood resonant properties' forecasting based on its ‘wood study portrait’ parameters.
Conclusions: Acoustic properties of wood depend on biomorphology of a tree as well. The parameters of stem tapering, trunk volume and especially branchless zone extension and crown elevation have, to any extent, the greatest practical value for standing resonant raw material express diagnostics.
Background and Purpose: Studies of the physical-mechanical and acoustic properties of maple wood as a potential material for musical instruments manufacturing are extremely scarce. Related to this, ...dendro-acoustic studies of maples introduced by geographic origin are of great practical importance in order to create target plantations with predicted technical quality of wood.
Materials and Methods: Maples from abroad introduced by geographic origin into the Botanical Garden of the Volga State University of Technology of the Republic of Mari El of Russia were used for the research. For comparison, the Norway maple of local origin (Acer platanoides L.) was selected. The studies were carried out by the frequency-amplitude method for determining Young's dynamic modulus and the acoustic constant of sound emission according to the criterion of academician N. Andreyev.
Results: It was revealed that there are differences in the density and dendroacoustic indices of maple wood of local origin and maple trees introduced by geographic origin. Norway maple (Acer platanoides L.) turned out to possess the largest acoustic constant characterizing the resonant properties of wood. Introduced maple trees, plane-tree maple (Acer pseudoplatanus L.) and sugar maple (Acer saccharinum L.) are only slightly inferior in terms of this indicator.
Conclusions: The dendroacoustic properties of maple wood are generally much lower than that of resonant spruce. Consequently, the acoustic role of maple wood in the back plates of the violin and other string instruments is completely different than that of the top plate made from the resonant material of coniferous species. To reveal this difference in more detail, comparative studies and dendroacoustic identification of maple wood in blanks and musical instruments with different levels of acoustic characteristics are necessary.
Strength of aged wood in old constructions Fedyukov, Vladimir; Chernov, Vasilii; Chernova, Maria
Istraživanja i projektovanja za privredu,
2020, Letnik:
18, Številka:
1
Journal Article
The paper presents the results of dendroacoustic research and statistical and correlation analysis. The insights of heuristic identification based on biotechnology law are also given with the aim of ...defining the relationship of wood resonant properties with the form of seed scales of spruce growing in the Kama-Volga region of Russia. Key words: sonorous spruce, cone biomorphology, wood macrostructure, density, sound velocity, acoustic constant, dendroacoustic indices identification U radu su prikazani rezultati dendroakustickog istraZivanja te statisticke i korelacijske analize. Autori takoder daju uvid u heuristicku identifikaciju utemeljenu na primjeni biotehnickog zakona radi definiranja odnosa rezonantnih svojstava drva i oblika ljuske smrekova sjemena u ruskoj regiji Kama-Volga. Kljucne rijeci: akusticna smreka, biomorfologija cesera, makrostruktura drva, gustoca drva, brzina zvuka, akusticna konstanta, identifikacija dendroakustickih indikacija
U radu su prikazani rezultati dendroakustičkog istraživanja te statističke i korelacijske analize. Autori također daju uvid u heurističku identifikaciju utemeljenu na primjeni biotehničkog zakona ...radi definiranja odnosa rezonantnih svojstava drva i oblika ljuske smrekova sjemena u ruskoj regiji Kama-Volga.
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