Effect of hydrothermal treatment on the acoustic properties of wood from Walnut and Elm species, utilizable in musical instruments

Ghofrani, Mohammad; Hosseinkhani, Hossein; Rahimi Dastjerdi, Habib; Khojasteh Khosro, Saeid; Amiri, Parviz

doi:10.22092/ijwpr.2014.8648

Document Type : Research Paper

Authors

¹ Associate Professor at Department of Wood Science and Technology, Faculty of Civil Engineering, University of Shahid Rajaee Teacher Training, Tehran, Iran

² - Faculty member, M.Sc., Department of Wood Science and its products, Research Institute of Forests and Rangelands, Tehran, Iran

³ Masters Student at Department of Wood Science and Technology, Faculty of Civil Engineering, University of Shahid Rajaee Teacher Training, Tehran, Iran

⁴ Assistant professor of electrical ENG-Electronic department in shahid rajaee teacher training UNIV

https://doi.org/10.22092/ijwpr.2014.8648

Abstract

The objective of this study was to investigate the influence of hydrothermal treatment of walnut (Juglans regia) and caucasian elm (Zelkova Carpinifolia) wood species on their acoustic properties in radial and tangential directions. For this purpose, specimens were prepared with dimensions of 360 (L) ×20 (R) ×20 (T) mm. Heat treatments in water medium were performed at 150ºC for 5 hours. Acoustic properties of specimens (specific modulus of elasticity, damping, acoustical coefficient, acoustical conversion efficiency and wave velocity) measured by free flexural vibration on a free-free bar method. Properties of treated specimens compared with control specimens. Result showed that hydrothermal treatment improved all acoustic properties of specimens. Acoustic properties of radial and tangential surfaces of walnut wood did not show significant difference; while in caucasian elm significant differences obtained between radial and tangential surface properties. Generally, better acoustic properties achieved in tangential direction of heat-treated Caucasian elm species. So, it is recommended as a suitable specimen to be used in making the sound-boards of musical instruments such as Iranian Santour and Xylophones and also resonator boxes.

Keywords

Main Subjects

Mechanical conversion of wood and wooden fittings

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Effect of hydrothermal treatment on the acoustic properties of wood from Walnut and Elm species, utilizable in musical instruments

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Volume 29, WINTER 4 - Serial Number 49February 2015Pages 636-647

Volume 29, WINTER 4 - Serial Number 49
February 2015
Pages 636-647