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Practical techniques for the vibration method with additional mass: bending vibration generated by tapping cross section

Kubojima, Yoshitaka, Sonoda, Satomi, Kato, Hideo
Journal of wood science 2018 v.64 no.1 pp. 16-22
air drying, modulus of elasticity, relative humidity, vibration
This work examines the effect of a method for generating bending vibration on the accuracy of a nondestructive and simple estimation of weight, density, and Young’s modulus through a vibration test without measuring specimen weight. The resonance frequencies with and without the concentrated mass generated by tapping the RT (radial tangential)-plane under the free-free condition were compared with those generated by the normal free-free bending vibration. The air-dried specimens and wet specimens in a drying process at 20 °C and 65% relative humidity were used and then their weight, density, and Young’s modulus were estimated by the vibration test. The appropriate resonance frequency of the bending vibration could be obtained by tapping the RT-plane. Generating bending vibration by tapping the RT-plane is effective for the application of the vibration method with additional mass to a drying process.