| The main objectives of this project were to develop a dynamic model for a papermaking process and to develop a tool for evaluating the dynamic operability of a system.; In the first part of the project, several commercial simulation packages were evaluated to determine their capabilities for dynamic simulation. Also, the conditions affecting the accuracy of these simulators were studied, as well as the specific techniques to minimise the calculation errors.; The purposes of the dynamic simulation were to study the process variability due to changes in process and control in the broke management system, and to be used as a 'virtual' plant for the operability analysis.; In the second part of this project an operability analysis on the stock proportioning system was performed, using the methodology by Vinson and Georgakis (2000) for steady-state systems. Basic ideas of this approach were used for developing a new framework for dynamic operability assessment. The proposed methodology combines well-established concepts and a few new ideas. A new dynamic operability measure (dOM) was proposed by taking into account the process inherent operability characteristics and the control system. A new control performance index was defined, by taking into consideration the contributions of controlled and manipulated variables. (Abstract shortened by UMI.)... |
