20.500.12556/RUL-174610 Thermal treatment, moisture content, and vibration direction’s effect on dynamic properties of spruce wood (Picea abies) for musical instruments The article examines the main and interactive effects of thermal modification (TM), relative humidity (RH), and direction of vibration on the density, modulus of elasticity (MOE) and shear modulus of spruce wood. Samples were thermally modified at 180, 200, and 230 °C and then equilibrated at 20%, 44%, 76%, and 88% RH. The MOE in the longitudinal direction and the shear moduli GLR and GLT were calculated from the natural frequencies of the first three lateral vibration modes of free-free specimen. EL-R and GLR were determined from the vibration frequencies when the specimens vibrated laterally in the longitudinal-radial plane, while EL-T and GLT were determined from vibration frequencies when the specimens vibrated in longitudinal-tangential plane. Density, MOE, and shear moduli decreased at the highest TM level by averages of 16%, 9.8% and 9.7%, respectively. Acoustic coefficients such as the sound velocity (c), the sound radiation coefficient (R) and the characteristic acoustic impedance (ACE) were determined. On average, c and R increased as a function of RH from 1% to 3% and from 10% to 15%, respectively, while ACE decreased from 7% to 13%. The test material was classified for making soundboards for musical instruments. specific modulus of elasticity shear modulus speed of sound natural frequency fast fourier transform sound radiation coefficient characteristic acoustic impedance specifični modul elastičnosti strižni modul hitrost zvoka lastna frekvenca hitra Fourierjeva transformacija koeficient zvočnega sevanja karakteristična akustična impedanca true false true Angleški jezik Slovenski jezik Članek v reviji 2025-10-07 09:32:54 2025-10-07 09:33:02 2025-11-24 03:46:49 0000-00-00 00:00:00 2025 0 0 Str. 9857--9876 issue 4 Vol. 20 2025 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 2025-01-01 674:519.8 1930-2126 10.15376/biores.20.4.9857-9876 252010755 merhar_et_al.BioRes_20_4_9857_Merhar_DKB_Thermal_Moisture_Spruce_Music_24839.pdf merhar_et_al.BioRes_20_4_9857_Merhar_DKB_Thermal_Moisture_Spruce_Music_24839.pdf 1 C53BC74A71E7BE080B9A9E68F1540FA1 28eca75783236eb72bbbd93dfe4d77530fb97dada2fd3df8d30d6ac71f39d6e6 01e41abb-a350-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=219451 https://bioresources.cnr.ncsu.edu/resources/thermal-treatment-moisture-content-and-vibration-directions-effect-on-dynamic-properties-of-spruce-wood-picea-abies-for-musical-instruments/ 1 a3ba8772-a34f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=219450 Biotehniška fakulteta 0 0 0