Gain scheduling

If the forward velocity of the ship is the state variable u, a best estimate of which is given by the Kalman filter, the gain scheduling controller can be expressed as... 

Gain Scheduling Adaptive Control is a special application of this procedure. For example we may have a control valve whose characteristic (input signal/valve stem position relationship) is non-linear. In this case, the valve stem position would be measured in order to obtain the gain of the valve (the appropriate relationship must be known) and the valve gain is used then to adjust the gain of the controller. If the auxiliary variable relationships are more complicated then it may be necessary to employ a Programmed Adaptive Control procedure. 

Economic Incentives for Automation Projects Industrial applications of advanced process control strategies such as MPC are motivated by the need for improvements regarding safety, product quality, environmental standards, and economic operation of the process. One view of the economics incentives for advanced automation techniques is illustrated in Fig. 8-41. Distributed control systems (DCS) are widely used for data acquisition and conventional singleloop (PID) control. The addition of advanced regulatory control systems such as selective controls, gain scheduling, and time-delay compensation can provide benefits for a modest incremental cost. But... 

Figure 4.10 Gain scheduling Kc changed from 0.1 to 0.05 at 55 min 45 min ramp 4 jacket area.

Figure 4.15 Fed batch hot reaction jacket area gain scheduling.

Remark. Notice that the gain scheduling is comparable to feedforward compensation. There is no feedback to compensate for incorrect adaptation. 

Figure 22.2 (a) Feedback control loop for Example 22.1 (b) corresponding gain scheduling adaptive control. 

What is gain scheduling control, and why can you use it in chemical process control It was claimed in Example 22.1 that it resembles feedforward compensation. Explain why. What are its advantages and disadvantages ... 

W. L. Luyben, Fed-batch reactor control using lag compensation and gain scheduling, Ind. Eng. 

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