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Ing. Jakub Dömény, Ph.D.
Identification number: 26568
University e-mail: jakub.domeny [at] mendelu.cz
 
Výzkumník projektu I - Department of Wood Science and Technology (FFWT)

     
Lesson     Final thesis     
Publications
     Conferences
     

The following list contains all information available to the publication.

SUCHOMELOVÁ, P. -- DÖMÉNY, J. -- DOSKOČIL, T. -- ZATLOUKAL, P. -- TIPPNER, J. Numerical Study of Sorption Behavior of Piano Soundboard. In Proceedings of the 2020 Society of Wood Science and Technology International Convention . Monona: Society of Wood Science and Technology, 2020, p. 76--77. ISBN 978-1-7340485-0-6.

Original name:
Numerical Study of Sorption Behavior of Piano Soundboard
Czech name:
Written by (author):
Ing. Pavlína Suchomelová
Ing. Jakub Dömény, Ph.D.
Tadeáš Doskočil
Ing. Petr Zatloukal
Ing. Jan Tippner, Ph.D.
Department:
Department of Wood Science and Technology
Kind of publication:
abstract of an article in anthology
Collection:
Proceedings of the 2020 Society of Wood Science and Technology International Convention
Nature of article:
paper
Part number:
Starting page:
76
Up to page:
77
Number of pages:
2
Original language:
English
Description in original language:
Wooden musical instruments are strongly influenced by moisture content. Moisture induce the changes of tuning, defects and resonance properties of pianos. Minimization of wood hygroscopicity ensures the shape stability and stable acoustic properties of the soundboard during the changes of ambient climatic conditions (relative air humidity, temperature). Complex physical model of piano soundboard provides a reliable tool to describe the sorption properties of piano soundboard and possibilities to improve the resistance to moisture influence by thermal modification of wood. The main goal of modelling is shortening the development of the appropriate modification process. The numerical model of thermally treated and untreated wood was designed, implemented into the FEM based computational software and validated on small samples (44 x 450 x 12 mm). The sorption properties of treated and untreated resonance spruce wood (Picea abies (L.) Karst) were experimentally evaluated. All the samples were conditioned in the laboratory chamber to 7 states of the equilibrium moisture content (EMC). The duration of attaining the EMC (sorption dynamics), dimensional changes and the weight changes (density) were recorded and used for the validation of numerical model. The model of moisture diffusion is based on the partial differential equation which stems from the transient form of Fick's law. No significant influences of the temperature field on the diffusion were found, so all the tasks were solved isothermally. Validated numerical model was applied on the geometries of real piano soundboards with respect to the wood fiber deflection. The longitudinal, radial and tangential diffusion coefficients were considered as a function of actual moisture content. The results show that the thermally modified soundboard reaches the EMC 3 times slower than untreated soundboard, what is caused mainly by the change of the diffusion coefficients. The influences of the moisture transfer coefficient value were also investigated to detect the influence of the surface layer varnishing. Its influence was found to be very significant - by reducing the coefficient in one order of magnitude (from 1E-7 to 1E-8 m.s-1), the time of reaching the EMC is 3 times longer. The numerical evaluation of piano soundboard showed the influence of individual parameters on its sorption behavior and helped to reveal the key factors that need to be addressed during the development of thermally modified soundboards.
Description in English:
Description in Czech:
Year of submission:
2020
 
Entry made by:
Last change:
08/13/2020 10:30 (Mgr. Kamila Zoufalá)

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Source specification:

Proceedings of the 2020 Society of Wood Science and Technology International Convention . Monona: Society of Wood Science and Technology, 2020. ISBN 978-1-7340485-0-6.

Original name:
Proceedings of the 2020 Society of Wood Science and Technology International Convention
English name:
Czech name:
Editor:
Kind of publication: conference proceedings
ISBN:
978-1-7340485-0-6
Publisher:
Society of Wood Science and Technology
Place of publishing: Monona
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Year of publication: 2020
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Number of pages:
Entry: 2020 Society of Wood Science and Technology (SWST) International Convention
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Description in English:
Description in Czech:
 
Entry made by:
Mgr. Kamila Zoufalá
Last change:
08/11/2020 09:18 (Mgr. Kamila Zoufalá)

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Source specification:

2020 Society of Wood Science and Technology (SWST) International Convention. 2020, Portorož.

Original name: 2020 Society of Wood Science and Technology (SWST) International Convention
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Kind of publication:
holding a conference
Venue:
Portorož
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Time scope of event:
worldwide event
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2020
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Entry made by:
Mgr. Kamila Zoufalá
Last change: 08/11/2020 09:18 (Mgr. Kamila Zoufalá)

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