The main purpose of every feedback loop, created by nature or designed by engineers, is to reduce the effect of uncertainty on vital system functions. Indeed, feedback as a design paradigm for dynamic systems has the potential to counteract uncertainty. However, dynamic systems with feedback (closed-loop systems) are often more complex than systems without feedback (open-loop systems), and the design of feedback controllers involves certain risks. Feedback can be used for stabilization, but inappropriately designed feedback controllers may reduce, rather than enlarge, regions of stability. A feedback controller that performs well on a linearized model may in fact drastically reduce the stability region of the actual nonlinear system.
KeywordsState Feedback Robust Control Nominal Plant Robust Nonlinear Control State Space Method
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