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Akustične lastnosti lesenih cevnih resonatorjev
ID Ogrinec, Domen (Author), ID Straže, Aleš (Mentor) More about this mentor... This link opens in a new window

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Abstract
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.

Language:Slovenian
Keywords:les, akustične lastnosti, cevni resonatorji, aerofoni
Work type:Bachelor thesis/paper
Typology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Publisher:[D. Ogrinec]
Year:2020
PID:20.500.12556/RUL-119425 This link opens in a new window
UDC:630*812.12
COBISS.SI-ID:27402755 This link opens in a new window
Publication date in RUL:09.09.2020
Views:1121
Downloads:125
Metadata:XML DC-XML DC-RDF
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Secondary language

Language:English
Title:Acoustical properties of wooden resonant pipes
Abstract:
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.

Keywords:wood, acoustic properties, resonant pipes, aerophones

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