• Randy A. Freeman
  • Petar Kokotović
Part of the Modern Birkhäuser Classics book series (MBC)


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.


State Feedback Robust Control Nominal Plant Robust Nonlinear Control State Space Method 
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Copyright information

© Birkhäuser Boston 2008

Authors and Affiliations

  • Randy A. Freeman
    • 1
  • Petar Kokotović
    • 2
  1. 1.Department of Electrical and Computer EngineeringNorthwestern UniversityEvanstonUSA
  2. 2.Department of Electrical and Computer EngineeringUniversity of CaliforniaSanta BarbaraUSA

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