A continuous ultrasonic scanner for lumber grading /
0.590 and 0.398 respectively. These two nondestructive
| Main Author: | |
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| Format: | Thesis eBook |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | Link to OAKTrust copy |
| Summary: | 0.590 and 0.398 respectively. These two nondestructive and MOE. The coefficient of determination (R) between the and transverse vibration MOE were measured. Utrasonic stress density to provide R2 values of 0.760 and 0.725 respectively. grading technology through more accurate lumber strength and improved by combining the ultrasonic variables with MOE and in tension at a span of 3.35 m (11 ft). Multivariate in.) x 152 mm (6 in.) x 5.49 m (18 ft) long No. 1, No. 2, and information provided the highest R2 of 0.777. The average knots, two growth characteristics which greatly affect length of each sample with a prototype ultrasonic lumber localized stress wave characteristics in lumber, 2) verify No. 3 grade Southern Pine lumber. After the lumber had potential for accurate prediction of lumber strength and predict MOE. The W between the predicted and transverse predicted and actual UTS using the MOE and density data was prototype ultrasonic lumber scanning system to measure provided a higher R2 of 0.658. The correlation was further reached its equilibrium moisture content, the gross density regression techniques were used to develop several scanner. This scanner used a configuration of four 200 kHz statistical models to predict ultimate tensile stress (UTS) stiffness predictions. Specific objectives are: 1) develop a stiffness, and information obtained from this research can be strength and modulus of elasticity of Southern Pine lumber. strength than MOE and density. Utrasonics show great tensile strength. The lumber was then destructively tested testing (NDT) variables form the basis for current state of the art grading systems. The ultrasonic predictor variables The goal of this research was to improve mechanical stress The lumber sample contained 225 pieces of nominal 51 mm (2 The model combining the ultrasonics, density, and MOE the use of ultrasonics for predicting the long-span tensile transducers which were sensitive to slope of grain and edge used for future development of an ultrasonic grading system. variables were shown to be better predictors of lumber vibration MOE was 0.839. In conclusion, the ultrasonic wave travel times were automatically collected along the weighted longitudinal velocity and density were used to |
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| Item Description: | "Major subject: Agricultural Engineering". Vita. |
| Physical Description: | x, 140 leaves : illustrations ; 28 cm. Also available online. Issued also on microfiche from Lange Micrographics. |
| Bibliography: | Includes bibliographical references. |