20.500.12556/RUL-119425 Akustične lastnosti lesenih cevnih resonatorjev Acoustical properties of wooden resonant pipes V raziskavi smo preverjali akustične lastnosti ročno izdelanih lesenih cevi iz več drevesnih vrst (smreka, bor, lipa, oreh, javor, bukev, hrast, breza, hruška, češnja, ameriški oreh, gaber, brest, robinija). Akustične lastnosti cevi smo proučevali s frekvenčnem odzivom pri prečnem nihanju, zvočni stolpec pa smo proučevali v 1., 2. in 3. nihajnem načinu odprte cevi. Najvišji povprečni zvočni tlak smo določili v cevnih resonatorjih, ki so bil narejen iz lesa robinije, smreke in bora. Zvočni tlak v cevnem resonatorju je bil večji v primeru izdelave iz lesa z večjo specifično togostjo ter z boljšo učinkovitostjo pretvorbe mehanske energije v zvočno (ACE). Z jakostjo nihanja zvočnega stolpca se je povečevalo tudi nihanje (resoniranje) sten cevnih resonatorjev. Resoniranje je bilo najboljše pri smrekovini, pri kateri smo izmerili največjo specifično togost. Na iznihanje zvočnega stolpca v resonatorju so značilno vplivale tudi dušilne lastnosti lesa v steni cevnega resonatorja. Slednje je bilo daljše ob uporabi resonančnega lesa z manjšim dušenjem mehanskih vibracij. In this research, we examined the acoustic properties of hand-made wooden pipes made from several tree species (spruce, pine, linden, walnut, maple, beech, oak, birch, pear, cherry, American walnut, hornbeam, elm, black locust). The acoustic properties of the pipes were studied based on the frequency response at transverse vibration, while the sound vibration was studied in the 1st, 2nd, and 3rd modes of the open tube. The maximum average sound pressure was determined in a tubular resonator made of black locust, spruce, and pine wood. The sound pressure in the tubular resonator was higher when the resonator was made of wood with a higher stiffness to weight ratio and better acoustic conversion efficiency (ACE). The vibration (resonance) of the tube resonator walls increased with the intensity of the sound vibration in the pipe. The resonance of spruce wood was the highest, where we measured the highest stiffness to weight ratio. The sound vibration sustained in the resonator was also significantly influenced by the damping properties of the wood in the wall of the tubular resonator. The sound sustain was longer when wood with lower vibration damping properties was used. les akustične lastnosti cevni resonatorji aerofoni wood acoustic properties resonant pipes aerophones true false false [D. Ogrinec] Slovenski jezik Angleški jezik Diplomsko delo/naloga 2020-09-09 07:15:29 2020-09-09 07:15:36 2022-08-31 03:53:02 0000-00-00 00:00:00 2020 0 0 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*812.12 179407 27402755 10698.pdf 10698.pdf 1 DA8D4A4171936AF597BD3BEF8BEC5151 5c428453e43f21e54914e41760362fb4ab7ee3c4875691a6f97e15adaf947bcb d30cb9b1-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=134136 Biotehniška fakulteta 0 0 0