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Akustične lastnosti bukovine po hidrotermični obdelavi
ID Žveplan, Ervin (Author), ID Straže, Aleš (Author)

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Abstract
Raziskali smo akustične lastnosti bukovine (Fagus sylvatica L.) po hidrotermični obdelavi. Iz dveh bukovih hlodov smo izžagali 10 parov radialno orientiranih preizkušancev nominalnih dimenzij 500 mm % 160 mm % 12 mm ter jih naravno posušili. Preizkušance smo 1 uro tretirali v nadtlačnem hidrotermičnem procesu pri temperaturi 135 °C. Po uravnovešenju pri 20 °C in 50 % zračni vlažnosti smo preizkušancem določili gostoto, hitrost preleta ultrazvoka v posameznih anatomskih smereh ter barvo po CIELab sistemu. Pri impulznem prečnem mehanskem vzbujanju smo določili še kazalnike akustične kakovosti. Določili smo akustični koeficient (K), dušenje zvoka (tan ▫\delta$▫) in relativno učinkovitost akustične pretvorbe (RACE). Po hidrotermični obdelavi smo potrdili zmanjšanje gostote bukovine ter povečanje hitrosti zvoka in togosti v vseh anatomskih smereh. Mehanska anizotropija lesa se je po obdelavi zmanjšala. Celotne barvne spremembe so bile značilno linearno povezane s spremembo gostote in s tem ohranitvijo togosti bukovine. Kazalniki akustične kakovosti hidrotermično obdelane bukovine so se delno izboljšali. Potrdili smo višji specifični modul elastičnosti in akustični koeficient ter manjše dušenje prečnega nihanja hidrotermično obdelanega lesa

Language:Slovenian
Keywords:les, bukev, Fagus sylvatica, hidrotermična obdelava, mehanske lastnosti, akustične lastnosti
Typology:1.01 - Original Scientific Article
Organization:BF - Biotechnical Faculty
Year:2017
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:Str. 5-14
Numbering:Letn. 66, št. 2
UDC:630*812.12
ISSN on article:0024-1067
COBISS.SI-ID:2845577 This link opens in a new window
Publication date in RUL:28.10.2021
Views:180
Downloads:63
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Record is a part of a journal

Title:Les
Shortened title:Les
Publisher:Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije, Biotehniška fakulteta, Oddelek za lesarstvo, Založba Univerze, Biotehniška fakulteta, Oddelek za lesarstvo
ISSN:0024-1067
COBISS.SI-ID:13940224 This link opens in a new window

Secondary language

Language:English
Title:Acoustic properties of beech wood after hydrothermal treatment
Abstract:
We investigated the acoustic properties of beech wood (Fagus sylvatica L.) after hydrothermal treatment. Two beech logs were cut into 10 pairs of radially oriented specimens with the dimensions 500 mm % 160 mm % 12 mm and air dried. Specimens were thermally treated for 1 hour in saturated vapour pressure atmosphere at 135 °C. After the treatment the specimens were conditioned at 20 °C and 50 % RH and their wood density, speed of ultrasound in all directions and colour properties in CIELab colour space were determined. Free flexural vibration tests were used afterwards to determine the acoustic properties of wood. We defined acoustic coefficient (K), damping of sound (tan ▫\delta$▫) and relative acoustic conversion efficiency (RACE). The study confirmed a significant decrease of wood density after the hydrothermal processing. The increase in speed of ultrasound in hydrothermally-treated wood caused no change in the modulus of elasticity in all anatomical directions. Mechanical anisotropy of wood decreased slightly after the treatment. The colour measurements of specimens showed a linear correlation between the total colour change and change of wood density and stiffness. The acoustic properties of hydrothermally treated beech wood were partly improved due to the increase in the specific modulus of elasticity and the acoustic coefficient combined with the decrease in vibration damping

Keywords:wood, beech, hydrothermal treatment, mechanical properties, acoustic characteristics

Projects

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:P4-0015
Name:Les in lignocelulozni kompoziti

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