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The objective of this study was to increase the estimation accuracy of the vibration method with additional mass (VAM). The wood specimen was divided into a cut end and a main body. The cut end was used in VAM. The estimation accuracy of VAM was increased by using the cut end as the additional mass. Hence, the cut end had completely adhered to the main body before cutting. The estimation accuracy reduced with decreasing specimen length. In order to maintain high estimation accuracy, the specimen length should not be too short. The estimation accuracy of the longitudinal vibration was higher than that of the bending vibration because the variation range of the resonance frequency due to end cutting of the longitudinal vibration was lower than that of the bending vibration.

Use of cut specimen pieces in the vibration method with additional mass (VAM)