20.500.12556/RUL-122403 Vpliv obremenitve lesa na spremembe njegovih akustičnih lastnosti magistrska naloga The influence of wood loading on its changes of acoustical properties M. Sc. thesis 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. 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. les modul elastičnosti akustične lastnosti lesa sušenje navlaževanje wood E - modul acoustic properties drying wetting true false false [P. Jereb] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2020-12-09 13:09:15 2020-12-09 13:09:20 2022-09-02 04:03:09 0000-00-00 00:00:00 2014 0 Ljubljana 2014 Ljubljana XI, 81 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*812.12 2277513 MAG_Jereb_Peter_2014.pdf MAG_Jereb_Peter_2014.pdf 1 6006F4DE5F051DC39927D0EBFC0E28E0 981ab7c900bbb0c3c2d7b02505e23b29cbbe812534564eedd62c90e7ae0d9552 18e65f85-a1bb-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=137588 Biotehniška fakulteta 0 0 0