MODELING SIMULATION AND CONTROL OF THE WOOD DRYING PROCESS - PART 2 -VARIABLE CONTROL-STRUCTURE

The wood drying process (WDP), is described by an internal model (IM), contains four drying periods and a few different structures of mathem atical model. For a given state variables measured accuracy, using pie cewise linear approximation to analyse operating functions of these st ructures, a horizon of WDP can be determined. Based on this feature, a n observer is established, which can produce estimated state variables and estimated operating functions, thereby, the time delay can be com pensated. Applying a minimum consumption of energy and minimum drying time with the constrain of wood quality as the performance index, a re ference system model (RSM) is created and a switching space will be ca lculated to decide reference trajectories of WDP.