| 摘要 |
Methods are provided for estimating the dimensional stability of a wood product from simple algebraic functions of moisture, shrinkage rates and grain angles observed on outer surfaces. The methods may employ single or multiple sensor group measurements. The quantitative relationship between crook or bow stability and lengthwise shrinkage can be established using mathematical operations, rather than sophisticated and complicated finite-element modeling methods. In particular, the curvature of any board length-segment or section, expressed as the second derivative of the crook or bow profile, can be determined from a linear combination of the shrinkage values of the coupons including that segment or section. The overall crook or bow profile of the board can be determined from a section-by-section double-integration of those second derivative values.
|
