Vpliv obremenitve lesa na spremembe njegovih akustičnih lastnosti : magistrska naloga

Jereb, Peter (author), Gorišek, Željko (mentor), Straže, Aleš (reviewer)

Na šestih izbranih lesnih vrstah (smreka, jesen, bukev, oreh in češnja) smo med navlaževanjem in sušenjem preizkušancev proučevali spremembe modula elastičnosti, frekvenčni odziv in koeficient dušenja. Uporabili smo resonančno metodo z impulzivnim % elastičnim mehanskim vzbujanjem. Ugotovili smo, da je hitrost spremembe modula elastičnosti pri procesu sušenja dvakrat hitrejša kot pri navlaževanju. S povečevanjem vlažnosti se je koeficient dušenja zmanjševal, vendar so zveze statistično nezanesljive. Najmanjše dušenje zvoka smo zasledili pri jesenovini, smrekovini in češnjevini. Sprememba modula elastičnosti je bila v linearni odvisnosti od povprečne vlažnosti medtem, ko je bil odziv dušenja zvoka hitrejši, kar pripisujemo nastalemu vlažnostnemu gradientu.

• Language: Slovenian
• Keywords: les, modul elastičnosti, akustične lastnosti lesa, sušenje, navlaževanje
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: [P. Jereb]
• Year: 2014
• Number of pages: XI, 81 f.
• PID: 20.500.12556/RUL-122403
• UDC: 630*812.12
• COBISS.SI-ID: 2277513
• Publication date in RUL: 09.12.2020

JEREB, Peter, 2014, Vpliv obremenitve lesa na spremembe njegovih akustičnih lastnosti : magistrska naloga [online]. Master’s thesis. Ljubljana : P. Jereb. [Accessed 18 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=122403

Secondary language

• Language: English
• Title: The influence of wood loading on its changes of acoustical properties : M. Sc. thesis

Abstract

On a six selected species of wood - spruce, ash, oak, beech, walnut and cherry- all test specimens were moistened and dried, we investigated changes in the following modules: fundamental frequency, sound damping and elasticity. The method used was resonance with elastic mechanical excitation. We came to conclusion, that modulus of elasticity in drying process changed two times faster than in the moistening process. With moisture increasing, the sound damping coefficient was decreasing, but changes have not been proved statistically important. Lowest sound damping was detected in spruce, cherry and ash. The change in modulus of elasticity was in linear dependency with average moisture content, while response of sound damping was faster. We concluded, that this is due to the moisture gradient.

• Keywords: wood, E - modul, acoustic properties, drying, wetting