Closed-loop Process Identification

A primary requirement for the realization of FSA systems is the availability of a mathematical model for the actual process, and the ways to obtain this model may be broadly categorized into 2 methodologies: physical modelling techniques or process identification methods. The physical modelling approach seeks to derive the process model using fundamental laws governing the operations of the process, such as continuity and energy equations. Therefore, the parameters in the model have physical interpretations and they may sometimes be obtained from direct measurements on the process. Clearly, this modelling method requires a good and thorough understanding of the functioning of the entire process. However, even when the requirement can be satisfied, rarely can all parameters of the model be obtainable through direct measurements. Therefore, often physical modelling methods cannot be used alone and they are complemented with other modelling techniques.