Objectives for the tuning of the manipulated variables
Source: | Date:
2012-06-10
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The need for the tuning of the manipulated variables is a direct consequence of the original control problem ,which is classically one of the following two problems:
- In a regulation problem,a constant set-point vectoris defined (e.g.:the desired final mean moisture contents).The problem is to choose and design a controller that tunes the manipulated variables, such that the considered controlled variables (e.g.:final mean moisture contents of the product) tracks as best as possilbe their respective set-point and with a minimum variability during the drying.
- In an optimization problem,the idea is initially to state the criteria accounting for the controlled variables and/or the manipulated variables and/or the available state variables (which contain all the dynamic characteristics of the drying ).Then ,an optimization procedure adjusts the manipulated variables as to minimize these criteria.Constraints dealing with process limitations(e.g.: actuators magnitude have upper and lower bounds),process safety(e.g.:a maximum temperature threshold beyond which operation becomes hazardous), process specification (e.g.: a maximum known surface temperature beyond which final quality is too altered)may be explicitly incorporated into this formulation.
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