PI and Feedforward Controllers
analysis of a simple (i.e., rigid) antenna and simple (PI) controller (to derive basic properties of the closed loop system),
extension of the properties of a simple system to the real (flexible) antenna and a complex (LQG or H∞) controller.
The first step is discussed in this chapter, the second step in the next two chapters.
The combination of PI controller and rigid antenna allows for the closed-form analysis. The analysis includes the relationship between the proportional and integral gains and the closed loop properties of the antenna. This leads to the tuning method for the PI controller and to the closed loop equations of a flexible antenna with the PI controller. Next, the performance of the PI controller and its limits are discussed. Finally, the feedforward controller is analyzed.
Properties of the PI Controller
KeywordsTransfer Function Close Loop System Settling Time Wind Gust Feedforward Loop
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