Physical-acoustical characteristics of maple wood with wavy structure

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CONCLUSION The maple wood with wavy grain featured, on average, better physical-acoustic parameters than the maple wood without wavy structure. As such, the wavy wood complies with the criteria set for material for making back plates of high-quality violins. It was demonstrated that the discussed physical-acoustic properties were, apart from density, influenced by wood fibre waviness. Thus, this gives evidence that further research on the influence of this factor on the discussed properties, as well as the study of other differences in structure between these two types of maple wood is necessary. Acknowledgement: We highly acknowledge the support from the Scientific Grand Agency of the Ministry of Education SR and the Slovak Academy of Sciences (Grant No. 1/0565/10). REFERENCES 1. BUCUR, V., 1995: Acoustics of Wood. Boca Raton – New York – London – Tokyo, CRC Press, 284 pp. 2. UNDERLÍK, I., 2010: Vplyv štruktúry dreva na jeho kvalitu. In: Parametre kvality dreva urujúce jeho finálne použitie. (Ed. Kurjatko, S.), Zvolen, Technická univerzita vo Zvolene, pp. 282–310. 3. FABISIAK, E., MOLISKI, W., 2007: Variation in the microfibril angle in the tangential walls of the larch wood tracheids (Larix decidua Mill.) from plantation culture. Folia Forestalia Polonica, Seria B, 38(38): 41–53. 4. HOLZ, D., 1974: On some Important Properties of Nonmodified Coniferous and Broad Leaved Woods in View of Mechanical and Acoustical Data in Piano Soundboards. Arch. Akustiky. 9(1):37–57. 5. KUBOVSKÝ, I., 2007: Priama digitálna syntéza – cesta k zdokonaleniu aparatúry na vyšetrovanie rezonanného dreva. In: : Proceedings of the 1 th International Symposium Material – Acoustics – Place 2007. Zvolen, TU vo Zvolene, pp. 3941. 6. KÚDELA, J., KUNŠTÁR, M., 2011: Physical-acoustical characteristics vs. wood density. In: Proceedings of the 6 th International Conference Material – Acoustics – Place 2011. Zvolen, TU vo Zvolene, pp. 19. ISBN 978-80-228-2259-6 7. KURJATKO, S. et al., 2010: Parametre kvality dreva urujúce jeho finálne použitie. Zvolen: Technická univerzita vo Zvolene, 352 pp. 8. MOLISKI, W., KRAUSS, A., 2008: Radial gradient of moduluds of elasticity of wood and tracheid cell walls in dominat pine trees (Pinuus sylvestris L). Folia Forestalia Polonica, Seria B, 39(39): 19–29. 9. ONO T., NORIMOTO M. 1983: Study on Young’s modulus and internal friction of wood in relation to the evaluation of wood for musical instruments, Jap. J. Appl. Phys. 22: 611–614. 10. POŽGAJ, A., CHOVANEC, D., KURJATKO, S., BABIAK, M., 1997: Štruktúra a vlastnosti dreva. Bratislava, Príroda, 488 pp. 11. PILA, V., ŠRÁMEK, F. 1986: Umní houslau. Praha, Panton, 12. RAJAN, E. 1998: Akustika I. Zvolen, TU vo Zvolene, pp. 20–23, 41–43. 13. ROHANOVÁ, A., 2010: Hodnotenie mechanických vlastností smrekového dreva z pohadu navrhovania drevených konštrukcií. In: Drevo – štruktúra a vlastnosti. Zvolen, TU vo Zvolene pp. 17–26. 14. STN 49 0103: Drevo. Zisovanie vlhkosti pri fyzikálnych a mechanických skúškach. 1979 15. STN 49 0108: Drevo. Zisovanie hustoty. 1993. 17
16. VINTONIV, I. S., 1981: Nekatorye fizyko-mechanieskie svojstva svilevatoj drevesniny javora. Les. ž., 24(6):5658. Streszczenie: Fizyczne i akustyczne wasnoci jaworu falistego. Praca prezentuje ocen fizycznych i akustycznych wasnoci jaworu falistego. Z porównania wyniko e jawor falisty oprócz interesujcej struktury posiada lepsze wasnoci fizyczne i akustyczne od zwykego jawora. Falista struktura drewna nadaje silepiej na pyty dolne instrumentów smyczkowych. Badano take jak te wasnoci zale od gstoci. Badania zapewniy materia do analiz wpywu tego parametru na modu sprystoci, propagacj fal i st akustyczn. Wykazano istotne róznice pomidzy drewnem falistym i zwykym. Author’s address: Prof. Ing. Jozef Kúdela, CSc. Ing. Marek Kunštár Department of Wood Science Faculty of Wood Sciences and Technology Technical University in Zvolen T. G. Masaryka 24, 960 53 Zvolen Slovak Republic e-mail: kudela@vsld.tuzvo.sk marek.kunst@gmail.com 18
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Physical-acoustical characteristics of maple wood with wavy structure

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