Wednesday  |  Salon 7  |  03:30 PM–03:50 PM

#15814, The Verification of Prediction Model of Wood Knot and Internal Fiber Direction

In this paper, the three-dimensional fiber orientation scanning system (3D FOSS), which was developed in the Photomechanics Laboratory at National Tsing Hua University, was used to measure the in-plane angle (α) and the diving angle (β) of the wood.
After measuring the surface α and β, the wood prediction model proposed in this paper was used to predict the internal α and β of the wood. The wood prediction model includes two parts. The first part is the clear wood prediction model, and the second part is the knot cone model. In the clear wood prediction model, after measuring α and β on the top and bottom surfaces of wood test specimens, linear interpolation method was used to predict internal α and β. In the knot cone model, the circle Hough transform (CHT) was used to find the position and size of the knot on the top and bottom surfaces of wood test specimen, and then arithmetic sequence was used to calculate the position and size of the knot of each inner layer.

To prove the accuracy and reliability of the knot position and size of the prediction model, computed tomography (CT) was employed to scan the wood test specimen slice by slice. The results showed that knot position and size predicted by the knot cone model well matched with the CT image.

Wei-Chung Wang   National Tsing Hua University
Chin-Hsiang Hsu   National Tsing Hua University
Yen-Hsuan Huang   National Tsing Hua University