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4.3 Drying modelling - Measurement of kiln conditions and wood drying properties As the specialised instrumentation outputs were used for modelling purposes, and due to the large number of outputs over the 16 vacuum trials, only an example of each device output is provided. 4.3.1 Shrinkage and flying wood An example of the strain gauge output for the JAR10 vacuum trial test and flying wood boards is presented in Figure 53. Classical shrinkage curves are presented for the test boards and flying wood board. The strain gauge pairs for the two test boards can be seen to follow similar shrinkage paths. The curves for the flying wood board show stress reversal as expected. Figure 53. Strain gauge output example for trial JAR10 – E. marginata 4.3.2 Load/moisture content An example of the load cell output for the BBT11 vacuum trial test and flying wood boards is presented in Figure 54. The curves follow the expected reduction due to drying, however there appears to be some noise in the output signal which may be electrical or caused by vibration of the boards due to airflow. Further analysis involved smoothing these curves using the ‘sliding window’ algorithm in Matlab. Once smoothed we converted the curve output from mass to MC. These curves were used for model verification and comparisons as detailed in section 4.5 Drying modelling - Vacuum drying modelling. 95 Evaluation of super–heated steam vacuum drying viability and development of a predictive drying model for Australian hardwood species – Final reportPDF Image | Evaluation of super-heated steam vacuum drying
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