Model identification in extrusion cooking

摘要: Abstract In this paper extrusion cooking is reduced to a single input-single output process and identification techniques are applied derive transfer function models. A study reported of the open-loop relationships between screw speed as manipulated variable die pressure controlled when extruding wheat flour with twin-screw co-rotating extruder. Step tests were performed in various ranges from different working points. The auto-regressive moving average external input model structure was used; parameters estimated by error extensive predictive . responses these step complicated that steady-state gain not constant, identified functions two types fluctuate.