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Official Journal of the Japan Wood Research Society

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Application of modal analysis by transfer function to nondestructive testing of wood II: modulus of elasticity evaluation of sections of differing quality in a wooden beam by the curvature of the flexural vibration wave

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Abstract

 The shape of the flexural vibration wave of wooden beams at the first mode was detected using the transfer function. The dynamic modulus of elasticity (MOE) of beam sections of differing quality was estimated from the ratio of the curvature of the wave shape in this section to that of a clear beam. The results were as follows: (1) If a section with a lower dynamic MOE was introduced into a clear wooden beam, the curvature of the wave shape in that section became higher. (2) The ratio of the MOE and the reciprocal of the curvature ratio were highly correlated. (3) The MOE of a defect could be estimated, and the position of the defect could be determined accurately by examining the curvature of the flexural vibration wave shapes.

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Correspondence to Y. Ishimaru.

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Received: March 22, 2002 / Accepted: May 15, 2002

Part of this report was presented at the 50th Annual Meeting of the Japan Wood Research Society, Kyoto, April 2000. This article is translated from the Japanese version, which was published in Mokuzai Gakkaishi 47(5), 2001

Correspondence to:Y. Ishimaru

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Yang, X., Amano, T., Ishimaru, Y. et al. Application of modal analysis by transfer function to nondestructive testing of wood II: modulus of elasticity evaluation of sections of differing quality in a wooden beam by the curvature of the flexural vibration wave. J Wood Sci 49, 140–144 (2003) doi:10.1007/s100860300022

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  • Key words Nondestructive testing
  • Modal analysis
  • Flexural vibration
  • Modulus of elasticity
  • Transfer function