American Journal of Agriculture and Forestry
Volume 7, Issue 3, May 2019, Pages: 119-125
Received: May 16, 2019;
Accepted: Jun. 13, 2019;
Published: Jun. 26, 2019
Views 585 Downloads 77
Olaoye Kayode Oladayo, Department of Wood and Paper Technology, Federal College of Forestry, Forestry Research Institute of Nigeria, Ibadan, Nigeria
Okanlawon Funmilayo Busola, Department of Wood and Paper Technology, Federal College of Forestry, Forestry Research Institute of Nigeria, Ibadan, Nigeria
Moisture in wood has been found to influence properties and performance of wood in service. The hygroscopic nature of wood makes it continuously absorb moisture from the environment and as such render wood unstable. Meanwhile, little or no information has been provided on few acoustic property of wood with respect to moisture. This study thus aim at providing more information about the acoustic properties of A. adianthifolia wood in relation to moisture. Three tress of A. adianthifolia wood were fell and samples were taken axially and radially. Acoustic test was done on the sample at green state, oven dried (OD) state and at equilibrium moisture content (EMC) state. many of the acoustic properties obtained at EMC were best such that mean fundamental frequency was 807.94HZ, specific elastic modulus – 12.65GPa, damping factor – 0.009, velocity of sound – 3542.66m/s, acoustic coefficient – 5.76, Sound quality – 126.01 and acoustic conversion efficiency – 731.75m4kg-1s-1. Optimal acoustic performance of this wood species was not recorded at oven dried state. Thus, this study revealed that a little amount of moisture in wood may be needed for optimal acoustic performance, and as such the wood of A. adianthifolia performed better at ambient temperature. However, studies into other wood species are needed to substantiate this claim.
Olaoye Kayode Oladayo,
Okanlawon Funmilayo Busola,
Acoustic Properties of Albizia Adianthifolia (schum.) Wood in Relation to Moisture, American Journal of Agriculture and Forestry.
Vol. 7, No. 3,
2019, pp. 119-125.
Samuel, V. G. and Samuel L. Z. (2010). Moisture Relations and Physical Properties of Wood, CHAPTER 4.
Tsoumis, G. (1991). Science and Technology of Wood- Structure, Properties Utilization. New York: Van Nostrand Reinhold.
Keay, R. W. J., Onochie, C. F. A. and Stanfield D. P. (1989). Trees of Nigeria. “A revision version of Nigeria trees (1960, 1964). Oxford University Press. Pg – 246.
Baar Jan, Tippner Jan and Vladimir Grye (2016). Wood anatomy and acoustic properties of selected hardwoods; IAWA Journal 37 (1), 2016: 69-83.
Roohnia, M. (2005). Study on some factors affecting coefficient and damping properties of wood using Non-destructive Tests. Ph. D Thesis, Islamic Azad University Campus of Science and Researches, Tehran, Iran.
Ross, R. and Pellerin, R (1994). Non-destructive testing for assessing wood members in structures; a review. FPL-GTR-70. USDA, Forest Service, Forest Products Laboratory. FPL-GTR-70. USDA, Forest Service, Forest Products Laboratory.
Plack, C. J. Andrew, J. Oxenham. Richard, R. (2005). Pitch: Neural Coding and Perception. New York: Springer. ISBN 0-387-23472-1. (Retrieved from Wikipedia, 2015).
Mohammad, M. J., Seyyed, Y. M., and Soheil, P. (2014). Investigating the acoustical properties of carbon fiber-, glass fiber-, and hemp fiber-reinforced polyester composites. Polymer Composites. Vol. 35 (11): 2103-2111, November 2014. Version of Record online: 17 JAN 2014, DOI: 10.1002/pc.22872.
Roohnia, M., Hesami-dizaji, S. F., Brancheriau, L., Tajidini, A., Hemmasi, A. H. and Manouchechri, N. (2011). Acoustic properties in Arizona Cypress logs: a tool to select wood for sound board. Bioresources, 6, 386-399.
Non Destructive Testing Education Resource Center (2015). Acoustic impedance. The Collaboration for NDT Education, Iowa State University, www.ndt-ed.org.
Rujinirun, C., Phinyocheep, P., Prachyabrued, W. and Laemask, N. (2005). Chemical treatment of wood for musical instrument. Part I: acoustically important properties of wood for the Ranad. Wood Sci. Technol. 39: 77-85.
Ono, T. and Norimoto. M. (1983). Study on Young’s modulus and internal friction of wood in relation to the evaluation of wood for musical instruments. Japan. J. Appl. Physics 22 (4): 611-6 14.
James, W. L. (1964). Vibration, static strength, and elastic properties of clear Douglas fir at various levels of moisture content. Forest Prod. J. 14 (9): 409-413.
Sasaki, T., M. Norimoto, T. Yamada, and R. M. Rowell. (1988). Effect of moisture on the acoustical properties of wood. J. Japan Wood Res. Soc. 34 (10): 794-803.
Gerhards, C. C. (1982). Longitudinal stress waves for lumber stress grading: factors affecting applications: state of art. For Prod J 32: 20–25.
Sakai, H., Minimisawa, A., Takagi, K. (1990). Effect of moisture content on ultrasonic velocity and attenuation in woods. Ultrasonics 28: 382–385.
Minamisawa, A., Ozawa, A. (1994). Measurement of moisture diffusitivity in woods using ultrasound. Mokuzai Gakkaishi 40: 1052–1058.
Mishiro, A. (1996). Effect of density on ultrasonic velocity in wood. Mokuzai Gakkaishi 42: 887–894.
Olivito, R. S. (1996) Ultrasonic measurements in wood. Materials Eval 54: 514–517.