Acoustic properties of tropical woods used in marimba bars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F19%3A43917126" target="_blank" >RIV/62156489:43410/19:43917126 - isvavai.cz</a>

Výsledek na webu

—

DOI - Digital Object Identifier

—

Jazyk výsledku

angličtina

Název v původním jazyce

Acoustic properties of tropical woods used in marimba bars

Popis výsledku v původním jazyce

Marimba is an idiophone musical instrument. The most frequently used species for marimba bars are the tropical ones, such as Palissandre, Padouk, Wengé (etc...). The reasons rest on particular values of mechanical and acoustic properties needed for idiophone instruments, such as density, stiffness, hardness, dimensional stability, damping, radiation and acoustic conversion efficiency etc. This paper present experimental evaluation of main properties as well as relations between the properties. The vibro-acoustic properties were measured in bending based on the first vibration mode, so that the free-free vibration method was involved. The species implicated were Padouk, Jatobá and Merbau; 45 specimens were used for each wood species. The results evinced particular high values of damping, but still in the limits shown in literature. Merbau got the best MOE value. ACEs were precisely inside the range of literature. A direct relation between damping and density wasn&apos;t found; yet, a linear regression of Young&apos;s modulus of elasticity and tany (in Merbau) was reached with a r2 of 0.353. Eventually, Kruskal Wallis Anova evinced that M0EB assumed significant reduction with a damping over 0.007.

Název v anglickém jazyce

Acoustic properties of tropical woods used in marimba bars

Popis výsledku anglicky

Marimba is an idiophone musical instrument. The most frequently used species for marimba bars are the tropical ones, such as Palissandre, Padouk, Wengé (etc...). The reasons rest on particular values of mechanical and acoustic properties needed for idiophone instruments, such as density, stiffness, hardness, dimensional stability, damping, radiation and acoustic conversion efficiency etc. This paper present experimental evaluation of main properties as well as relations between the properties. The vibro-acoustic properties were measured in bending based on the first vibration mode, so that the free-free vibration method was involved. The species implicated were Padouk, Jatobá and Merbau; 45 specimens were used for each wood species. The results evinced particular high values of damping, but still in the limits shown in literature. Merbau got the best MOE value. ACEs were precisely inside the range of literature. A direct relation between damping and density wasn&apos;t found; yet, a linear regression of Young&apos;s modulus of elasticity and tany (in Merbau) was reached with a r2 of 0.353. Eventually, Kruskal Wallis Anova evinced that M0EB assumed significant reduction with a damping over 0.007.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20502 - Paper and wood

Projekt

—

Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2019

Kód důvěrnosti údajů

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

Název statě ve sborníku

Wood Science and Engineering in the Third Millenium: Proceedings of the International Conference (ICWSE 2019)

ISBN

—

ISSN

1843-2689

e-ISSN

—

Počet stran výsledku

6

Strana od-do

107-112

Název nakladatele

Universitatea Transilvania din Brasov

Místo vydání

Brasov

Místo konání akce

Brašov

Datum konání akce

7. 11. 2019

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

—