Advanced Control of the Wood Thermal Treatment Processing

Modeling of the Energy for Bound Water Freezing in Logs Subjected to Refrigeration

“…Good adequacy and precision of the model toward the results from wide own experimental studies allow the carrying out of various calculations with the model, which are connected to the nonstationary temperature distribution and energy characteristics of logs from different wood species during their refrigeration. The mathematical model, after its connection with other our model of the logs' defrosting process [9,10], could be input into the software of programmable controllers for optimized model-based automatic control [8,20,21,35] of thermal treatment of frozen logs in the production of veneer.…”

“…In the accessible specialized literature, there are limited reports about the temperature distribution in frozen logs subjected to defrosting [8,[11][12][13][14][15][16][17][18][19][20][21], and there is very little information about the research of the temperature distribution in logs during their freezing given by the authors only [22][23][24]. That is why the modeling and the multiparameter study of the freezing process of logs are of considerable scientific and practical interest.…”

Application of Neural Networks to the Optimization of the Thermal Treatment Process of Wood Materials

“…-To develop models with reduced dimensionality; -The biggest part of the calculations to be carried out off-line; -To accept a strategy of suboptimal control. The TTP is imposed on numerous constraints like [5] (1)…”

“…As more than 95% of the time the temperature θ m must be kept in the maximal available value θ m max Figure 3. Scheme of unified TTP model and it is impossible to fulfill the strict re-switching θ m max − θ m min − θ nn max due to the cooling/heating inertness, there can be used a slightly suboptimal control with active heating during the time (10) T 1 * = 1.03T 10 * , where T 10 * is the first switching time in a strict time-optimal control [5]. For each vector parameter p there is a special value of π and the power u.…”

“…During the last decade several intelligent techniques have been incorporated in modeling and model-predictive control of distributed parameter systems [5], and especially the implementation of artificial neural networks (NN) [6]. Though that wood thermal treatment processes were deeply studied in different technological aspects (e.g.…”