Akustične lastnosti lesenih cevnih resonatorjev

diplomsko delo

Domen Ogrinec (Author), Željko Gorišek (Reviewer), Aleš Straže (Mentor)

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.

Keywords

les;akustične lastnosti;cevni resonatorji;aerofoni;

Data

Language:	Slovenian
Year of publishing:	2020
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[D. Ogrinec]
UDC:	630*812.12
COBISS:	27402755
Views:	336
Downloads:	82
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Acoustic properties of wooden resonant pipes
Secondary 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.
Secondary keywords:	wood;acoustic properties;resonant pipes;aerophones;
Type (COBISS):	Bachelor thesis/paper
Study programme:	0
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	X, 35 f., [4] f. pril.
ID:	12029439