Analysis of strength grading of sawn timber based on numerical simulation

Numerical simulation is used to analyse machine strength grading of sawn timber. Starting from correlations between grade determining properties and measured grading properties, sets of values of properties are generated and machine grading simulated including the determination of settings and application of the settings to another generated sample. Results are obtained concerning the statistical effect of sample size to the accuracy of grading and yield to various grades. Also the lower tail of strength distribution of various grades was analysed with the conclusion that the highest grade has relatively better strength distribution than the lower grades