Kvarnkretssimulering för test av styrsystem
This thesis has been carried out in autumn 2009 at Uppsala University for Boliden Mineral AB. Physical modelling has been used to model a comminution circuit. The model has then been linked to a PLC.When a concentrator is about to become operational Boliden Mineral AB have been looking for a way to test the PLC. The purpose of this report has therefore been to develop models for the subprocess in a concentrator and link these models to the PLC. The subprocess was a comminution circuit in Aitik36. After models for the various processes had been developed they were implemented in Dymola/Modelica. Finally, the complete circuit model in Dymola were linked to a PLC. The model for an autogenous mill has become general since data from the actual process have not been possible to obtain. To compensate for this an evaluation of the model was conducted using operator experience and experience from development engineers.The conclusion is that Dymola/Modelica has proved to be a fine tool for modelling the processes that occur in a comminution circuit. It has also been proved possible to link these models to a PLC. By using physical models in Dymola/Modelica, it is possible to verify the code for a PLC.