20.500.12556/RUL-175551 Effects of coating ageing on the acoustic properties of Norway spruce (Picea abies) Norway spruce (Picea abies L. Karst) wood is a preferred resonance material for musical instruments, but the surface coatings used to protect it also alter its acoustic behaviour. In this study, the effects of nitrocellulose and polyurethane coatings on spruce lamellas during an ageing period of 300 days were investigated. Gloss, hardness, impact resistance, resonance frequencies, vibration damping (tan δ) and acoustic conversion efficiency (ACE) were measured. Both coatings initially reduced the resonance frequencies and moduli of elasticity (E), while increasing the tan δ and reducing the ACE, with the nitrocellulose having a greater effect. Ageing led to greater hardness, lower tan δ and improved ACE, which can be attributed to the progressive curing of the coatings. The strong correlation between hardness and acoustic parameters suggests that mechanical surface properties may serve as predictors of acoustic effectiveness. Polyurethane maintained acoustic performance better than nitrocellulose, although impact resistance decreased with ageing. These results emphasize the importance of choosing coating systems that balance durability and long-term acoustic requirements in instrument making. spruce wood nitrocellulose polyurethane acoustic properties damping coating properties coating ageing smrekov les nitroceluloza poliuretan akustične lastnosti dušenje lastnosti premazov staranje premazov true false true Angleški jezik Slovenski jezik Članek v reviji 2025-11-04 08:22:41 2025-11-04 08:22:47 2025-12-12 03:43:25 0000-00-00 00:00:00 2025 0 0 Str. 1-15 iss. 11, [art. no.] 1264 Vol. 15 2025 0000-00-00 Zaloznikova Objavljeno apc 0000-00-00 0000-00-00 0000-00-00 630*8 2079-6412 10.3390/coatings15111264 255614467 RAZ_Straze_Ales_2025.pdf RAZ_Straze_Ales_2025.pdf 1 44F21EAF3FC847620FC38701A96DAC14 682f9b410ba47d1e2874cdc9fb5eb2f639c3b9ba3eeb8fc8429ab78d1bf1ff63 086b92bf-b94f-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221302 https://www.mdpi.com/2079-6412/15/11/1264 1 c2d3ab5b-b94e-11f0-9328-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=221300 Biotehniška fakulteta 0 0 0