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Vpliv deleža zunanjega sloja trislojne iverne plošče na akustične lastnosti : diplomski projekt
Dežman, Žiga (Author), Medved, Sergej (Mentor) More about this mentor... This link opens in a new window, Gorišek, Željko (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/dv1_dezman_ziga.pdf This link opens in a new window

Abstract
Uporabnost ivernih plošč kot tudi ostalih lesnih kompozitov je nadvse široka. Uporablja se jih lahko tako v pohištveni industriji kot tudi v gradbeništvu, kjer so poleg mehanskih in sorpcijskih pomembne tudi akustične lastnosti. Na akustične lastnosti vpliva predvsem gostota plošče, ki pa jo lahko spreminjamo z uporabo različnih lesnih vrst in tudi s spreminjanjem razmerja med zunanjim in srednjim slojem. Želeli smo ugotoviti, kako spreminjanje razmerja zunanji/srednji sloj vpliva na absorpcijo zvoka in kakšna je vloga posameznega sloja. V laboratorijskih pogojih smo izdelali 3 različne iverne plošče, ki so se razlikovale glede na delež srednjega sloja (30 %, 45 % ter 60 %). Meritve smo opravili s pomočjo REW V5 programa, ki je Java aplikacija za merjenje akustike in analizo prostorov ter zvočniških odzivov. Vključuje orodja za generiranje testnih signalov, merjenje SPL-a (Sound Pressure Level -raven zvočnega tlaka) in impedance, itd. Opravljene meritve so pokazale, da na absorpcijo zvoka v največji meri vpliva zunanji sloj, grajen iz finejših delcev oz. iveri; saj je specifična površina drobnih iveri večja od tiste z večjimi, ki se nahajajo v srednjem sloju 3-slojne plošče, in ima tako večjo zmožnost absorpcije zvoka. Ugotovili smo tudi, da je pri ploščah z večjim deležem srednjega sloja absorpcija zvoka višjih frekvenc višja kot pa pri ploščah z manjšim deležem zunanjega sloja.

Language:Slovenian
Keywords:iverna plošča, struktura, delež sloja, akustične lastnosti
Work type:Bachelor thesis/paper (mb11)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2012
Publisher:[Ž. Dežman]
Number of pages:X, 39 f., [3] f. pril.
Place:Ljubljana
UDC:630*862.2
COBISS.SI-ID:2056329 Link is opened in a new window
Views:570
Downloads:149
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Secondary language

Language:English
Abstract:
Usability of particle board as well as other wood composites is very wide. They can be used in furniture industry as well as in the construction industry, where in addition to mechanical and sorption properties, acoustic are also important. Acoustic properties are influenced by the board density which can be changed by using different wood species, and also by changing the ratio between surface and core layer. We wanted to find out how changing the proportion of surface/core layer effects the absorption of sound and what the role of each layer is. In laboratory conditions we made 3 particle boards, different regarding to core layer share (30 %, 45 % and 60 %). Measurements were performed using REW V5 programme, a Java application for measuring room acoustics and analysing room and loudspeaker responses, including tools for generating test signals, measuring SPL (Sound Pressure Level), impedance, etc. The measurements show that the sound absorption is mainly affected by the surface layer, built with the finest particles having a larger specific area than bigger particles within the core layer of 3-layeredboard, and therefore greater ability to absorb sound. We also found that the absorption of sound at higher frequencies is higher at the core layer of plates than the plates with smaller amount of surface layer.

Keywords:particle board, structure, layer share, acoustic properties

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