The requirements on a control system may include many factors such as response to command signals, insensitivity to measurement noise and process variations, and rejection of load disturbances. The design of a control system also involves aspects of process dynamics, actuator saturation, and disturbance characteristics. It may, therefore, seem surprising that a controller as simple as the PID regulator can work so well generally. The general empirical observation is that most industrial processes can be controlled reasonably well with PID control provided that the demands on the performance of the control are not too high. Even then, for certain difficult classes of systems to be elaborated in the next section, PID control may not yield satisfactory performance. For these systems, a more complex control structure may be necessary, or new ways of tuning the PID controllers beyond the classical methods should be explored. This chapter covers several modern approaches towards PID design method under more performance-critical situations.
KeywordsRadis Basis Function Linear Quadratic Regulator Phase Margin Injection Molding Process Modern Design
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