Possibilities of Decreasing Hygroscopicity of Resonance Wood Used in Piano Soundboards Using Thermal Treatment

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F21%3A43918962" target="_blank" >RIV/62156489:43410/21:43918962 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.3390/app11020475" target="_blank" >https://doi.org/10.3390/app11020475</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/app11020475" target="_blank" >10.3390/app11020475</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Possibilities of Decreasing Hygroscopicity of Resonance Wood Used in Piano Soundboards Using Thermal Treatment

Popis výsledku v původním jazyce

This article presents the possibilities of decreasing moisture sorption properties via thermal modification of Norway spruce wood in musical instruments. The 202 resonance wood specimens that were used to produce piano soundboards have been conditioned and divided into three density groups. The first specimen group had natural untreated properties, the second was thermally treated at 180 oC, and the third group was treated at 200 oC. All specimens were isothermally conditioned at 20 oC with relative humidity values of 40, 60, and 80%. The equilibrium moisture content (EMC), swelling, and acoustical properties, such as the longitudinal dynamic modulus (E&apos;L), bending dynamic modulus (Eb), damping coefficient (tan δ), acoustic conversion efficiency (ACEL), and relative acoustic conversion efficiency (RACEL) were evaluated on every moisture content level. Treatment at 180 oC caused the EMC to decrease by 36% and the volume swelling to decrease by 9.9%. Treatment at 200 oC decreased the EMC by 42% and the swelling by 39.6%. The 180 oC treatment decreased the value of the longitudinal sound velocity by 1.6%, whereas the treatment at 200 oC increased the velocity by 2.1%. The acoustical properties EL&apos;, Eb, ACEL, and RACEL were lower due to the higher moisture content of the samples, and only the tanδ increased. Although both treatments significantly affected the swelling and EMC, the treatment at 180 oC did not significantly affect the acoustical properties.

Název v anglickém jazyce

Possibilities of Decreasing Hygroscopicity of Resonance Wood Used in Piano Soundboards Using Thermal Treatment

Popis výsledku anglicky

This article presents the possibilities of decreasing moisture sorption properties via thermal modification of Norway spruce wood in musical instruments. The 202 resonance wood specimens that were used to produce piano soundboards have been conditioned and divided into three density groups. The first specimen group had natural untreated properties, the second was thermally treated at 180 oC, and the third group was treated at 200 oC. All specimens were isothermally conditioned at 20 oC with relative humidity values of 40, 60, and 80%. The equilibrium moisture content (EMC), swelling, and acoustical properties, such as the longitudinal dynamic modulus (E&apos;L), bending dynamic modulus (Eb), damping coefficient (tan δ), acoustic conversion efficiency (ACEL), and relative acoustic conversion efficiency (RACEL) were evaluated on every moisture content level. Treatment at 180 oC caused the EMC to decrease by 36% and the volume swelling to decrease by 9.9%. Treatment at 200 oC decreased the EMC by 42% and the swelling by 39.6%. The 180 oC treatment decreased the value of the longitudinal sound velocity by 1.6%, whereas the treatment at 200 oC increased the velocity by 2.1%. The acoustical properties EL&apos;, Eb, ACEL, and RACEL were lower due to the higher moisture content of the samples, and only the tanδ increased. Although both treatments significantly affected the swelling and EMC, the treatment at 180 oC did not significantly affect the acoustical properties.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20501 - Materials engineering

Projekt

<a href="/cs/project/TH02010978" target="_blank" >TH02010978: Eliminace vlhkostního zatížení hudebního nástroje</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Applied Sciences

ISSN

2076-3417

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

10

Strana od-do

475

Kód UT WoS článku

000610904400001

EID výsledku v databázi Scopus

2-s2.0-85099178274