ウェーブレット変換による木材の性能評価法に関する研究(機械力学,計測,自動制御)

概要

論文の詳細を見る
Wavelet transform is effective in the processing of an unsteady signal like the tapping tone of the wood. In this study, we try to develop a method for evaluating wood quality using wavelet transform and the main results obtained can be shown as follows : 1) The Young's modulus calculated using the resonance frequency which is obtained from wavelet transform, is compared with the Young's modulus whose dead load is put on the sample. As for both the clear sample and the sample which includes a knot, Young's modulus of the wood can be estimated by finding resonance frequency in wavelet Transform. 2) Relation between the degradation of resonance frequency caused by the existence of a knot and the ratio of the knot and the diameter R_K can be approximated in the 1st polynomial in the region of R_K >50%. Therefore, the analysis of the resonance frequencys of clear wood and the wood which includes a knot leads to estimate the amount of knots of the wood.
一般社団法人日本機械学会の論文
2004-01-25